1 2 NEWS about less 3 4====================================================================== 5 6 For the latest news about less, see the "less" Web page: 7 http://www.greenwoodsoftware.com/less 8 You can also download the latest version of less from there. 9 10 To report bugs, suggestions or comments, send email to bug-less@gnu.org. 11 12====================================================================== 13 14 Major changes between "less" versions 451 and 458 15 16* Allow backslash escaping of metacharacters in LESS environment variable 17 after the --use-backslash option. 18 19* Don't quit if syntax errors are found in command line options. 20 21* Increase sizes of some internal buffers. 22 23* Fix configure bug with --with-regex=none. 24 25* Fix crash with "stty rows 0". 26 27* Fix Win32 attribute display bug. 28 29* Fix display bug when using up/down arrow on the command line. 30 31====================================================================== 32 33 Major changes between "less" versions 444 and 451 34 35* Add ESC-F command to keep reading data until a pattern is found. 36 37* Use exit code of LESSOPEN script if LESSOPEN starts with "||". 38 39* When up/down arrow is used on the command line immediately after 40 typing text, the next command starting with that text is found. 41 42* Add support for GNU regex. 43 44* Add configure option --with-regex=none and fix compile errors 45 when compiling with no regex library. 46 47* Fix bugs handling SGR sequences in Win32. 48 49* Fix possible crashes caused by malformed LESSOPEN or 50 LESSCLOSE variables. 51 52* Fix bug highlighting text which is discontiguous in the file 53 due to backspace processing. 54 55* Fix bug in displaying status column when scrolling backwards 56 with -J and -S in effect. 57 58====================================================================== 59 60 Major changes between "less" versions 443 and 444 61 62* Fix bug in unget handling that can cause strange effects on the 63 command line. 64 65* Remove vestiges of obsolete -l option that can cause a crash. 66 67====================================================================== 68 69 Major changes between "less" versions 436 and 443 70 71* Change search behavior such that when a search is given an explicit 72 pattern, the entire displayed screen is included in the search and 73 not just the portion after the target line. 74 75* Add -A option to change search behavior to the old way: only 76 the portion of the screen after the target line is searched. 77 78* Add %F formatting to prompt strings, replaced by the last component 79 of the input file. 80 81* Control-G while editing a command exits the command. 82 83* Less now exits with status 2 if control-C is pressed and -K is in effect. 84 85* Fix "ungetc overflow" when passing long commands via the -p option. 86 87* Fix bug in using line filtering via the & command 88 in combination with -i and -I. 89 90* Fix bug in handling negative arguments to the -j option. 91 92* Fix bug in handling %t in prompt strings. 93 94* Improve handling of long option names. 95 96* Improve percentage calculation for very large files. 97 98====================================================================== 99 100 Major changes between "less" versions 429 and 436 101 102* Don't pass "-" to non-pipe LESSOPEN unless it starts with "-". 103 104* Allow a fraction as the argument to the -# (--shift) option. 105 106* Fix highlight bug when underlined/overstruck text matches at end of line. 107 108* Fix non-regex searches with ctrl-R. 109 110====================================================================== 111 112 Major changes between "less" versions 424 and 429 113 114* LESSOPEN pipe will now be used on standard input, if the LESSOPEN 115 environment variable begins with "|-". 116 117* The -D option with one number now means use the normal background color. 118 119* Don't change permissions on history file if it is not a regular file. 120 121* Fix non-ANSI-compliant code that caused problems with some compilers. 122 123* Fix binary file detection in UTF-8 mode. 124 125* Fix display problems with long lines on "ignaw" terminals. 126 127* Fix problem interrupting the line number calculation for initial prompt. 128 129* Fix SGR emulation when dealing with multiple attributes (eg. bold+underline). 130 131* Fix highlight bug when searching for underlined/overstruck text. 132 133====================================================================== 134 135 Major changes between "less" versions 418 and 424 136 137* New "&" command allows filtering of lines based on a pattern. 138 139* Status column now displays a search match, even if the matched 140 string is scrolled off screen because -S is in effect. 141 142* Improve behavior of -F option. 143 144* Allow CSI character (0x9B) to work in UTF-8 mode. 145 146* Output carriage return at startup in case terminal doesn't default 147 to column 1. 148 149* Fix bug in '' (quote, quote) command after G command. 150 151====================================================================== 152 153 Major changes between "less" versions 416 and 418 154 155* Color escape sequences are now supported in WIN32 build. 156 157* Makefile now uses EXEEXT feature of autoconf. 158 159* Fix search bug when using -R and text contains ANSI color escape sequences. 160 161* Fix crash when using -r with UTF-8 text containing 0x9B bytes. 162 163* Fix display bug when using ' command to move less than one page forward. 164 165* Update GPL to version 3. 166 167====================================================================== 168 169 Major changes between "less" versions 409 and 416 170 171* New --follow-name option makes F command follow the name of a file 172 rather than the file descriptor if an open file is renamed. 173 174* Make searching with -i/-I work correctly with non-ASCII text. 175 176* Fix DJGPP build. 177 178====================================================================== 179 180 Major changes between "less" versions 406 and 409 181 182* Support CSI escape sequences, like SGR escape sequences. 183 184* Fix bug which caused screen to fail to repaint when window is resized. 185 186* Fix bug in using -i and -I flags with non-ASCII text. 187 188* Fix configure bug on systems which don't support langinfo.h. 189 190* Fix crash when searching text containing certain invalid UTF-8 sequences. 191 192====================================================================== 193 194 Major changes between "less" versions 394 and 406 195 196* Allow decimal point in number for % (percent) command. 197 198* Allow decimal point in number for -j option (fraction of screen height). 199 200* Make n command fetch previous pattern from history file on first search. 201 202* Don't rewrite history file if it has not changed. 203 204* Don't move to bottom of screen on first page. 205 206* Don't output extraneous newlines, so copy & pasting lines from the 207 output works better. 208 209* The -c option has been made identical with the -C option. 210 211* Allow "/dev/null" as synomym for "-" in LESSHISTFILE to indicate 212 that no history file should be used. 213 214* Search can now find text which follows a null byte, if the PCRE 215 library is used, or if no-regex searching (ctrl-R) is used. 216 217* Better compatibility with POSIX more specification. 218 219* Make -f work for directories. 220 221* Make "t" cmd traverse tags in the correct order. 222 223* Allow a few binary characters in the input file before warning 224 that the file is binary. 225 226* Don't warn that file is binary if it merely contains ANSI color sequences 227 and -R is in effect. 228 229* Update Unicode character tables. 230 231* Support DESTDIR in Makefile. 232 233* Fix bug when filename contains certain shell metacharacters such as "$". 234 235* Fix bug when resizing the window while waiting for input from a pipe. 236 237* Fix configure bugs. 238 239====================================================================== 240 241 Major changes between "less" versions 382 and 394 242 243* Add history file to save search and shell command history between 244 invocations of less. 245 246* Improve behavior of history list for search and shell commands. 247 248* Add -K (or --quit-on-intr) option to make less exit immediately on ctrl-C. 249 250* Improve handling of UTF-8 files and commands, including better 251 line wrapping and handling double-width chars. 252 253* Added LESSUTFBINFMT environment variable to control display of 254 non-printable characters in a UTF-8 file. 255 256* Add --with-secure option to configure, to make it easier to 257 build a secure version of less. 258 259* Show search matches in the status column even if search highlights 260 are disabled via the -G option or the ESC-u command. 261 262* Improve performance when the file contains very long lines. 263 264* Add "windows" charset. 265 266* Add man page for lessecho. 267 268* Add support for erase2 character, treated same as erase. 269 270* Use ASCII lowercase/uppercase logic when operating on the command line. 271 272* Update makefile for Borland C++ 5.5.1. 273 274* Fix bug in calculating number of pages for %D prompt. 275 276* Fix bug in handling tag file error. 277 278* Fix obscure bug if input file is deleted while viewing help. 279 280* Fix bug handling filenames which include square brackets. 281 282* Fix possible buffer overflow in "global" tag search. 283 284* Fix possible buffer overflow in usage of LESSOPEN and LESSCLOSE. 285 286* Fix buffer overflow in reverse search. 287 288====================================================================== 289 290 Major changes between "less" versions 381 and 382 291 292* Removed some old copyrighted code. 293 This probably breaks OS/9 support. 294 295====================================================================== 296 297 Major changes between "less" versions 378 and 381 298 299* New -L option to disable LESSOPEN processing. 300 301* Further support for large (64 bit) file addressing. 302 Large file support is now set up by the configure script. 303 304* Use autoconf 2.54. 305 Replace configure.in, acconfig.h, defines.h.top with configure.ac. 306 307* Overstriking underscore with underscore is now bold or underlined 308 depending on context. 309 310* Use only 7 spaces for line numbers in -N mode, if possible. 311 312* Fix some bugs in handling overstriking in UTF-8 files. 313 314* Fix some nroff issues in the man page. 315 316====================================================================== 317 318 Major changes between "less" versions 376 and 378 319 320* Bug fixes: 321 Default buffer space is now 64K as documented. 322 Search highlighting works properly when used with -R. 323 Windows version works properly when input file contains carriage returns. 324 Clean up some compiler warnings. 325 326====================================================================== 327 328 Major changes between "less" versions 358 and 376 329 330* -x option can now specify multiple variable-width tab stops. 331 332* -X option no longer disables keypad initialization. 333 New option --no-keypad disables keypad initialization. 334 335* New commands t and T step through multiple tag matches. 336 Added support for "global(1)" tags 337 (see http://www.gnu.org/software/global/global.html). 338 339* New prompt style set by option -Pw defines the message printed 340 while waiting for data in the F command. 341 342* System-wide lesskey file now defaults to sysless in etc directory 343 instead of .sysless in bin directory. 344 Use "configure --sysconfdir=..." to change it. 345 (For backwards compatibility, .sysless in bin is still recognized.) 346 347* Pressing RightArrow or LeftArrow while entering a number now shifts 348 the display N columns rather than editing the number itself. 349 350* Status column (enabled with -J) now shows search results. 351 352* Windows version sets window title. 353 354* Default LESSCHARSET for MS-DOS versions is now "dos". 355 356* Searching works better with ANSI (SGR) escape sequences. 357 ANSI color escape sequences are now supported in the MS-DOS (DJGPP) version. 358 359* Improved performance in reading very large pipes. 360 361* Eliminated some dependencies on file offets being 32 bits. 362 363* Fixed problems when viewing files with very long lines. 364 365* Fixed overstriking in UTF-8 mode, and overstriking tabs. 366 367* Improved horizontal shifting of text using -R option with ANSI color. 368 369* Improved handling of filenames containing shell metacharacters. 370 371* Some fixes for EBCDIC systems. 372 373* Some fixes for OS/2 systems. 374 375====================================================================== 376 377 Major changes between "less" versions 354 and 358 378 379* Add -J (--status-column) option to display a status column. 380 381* Add -# (--shift) option to set default horizontal shift distance. 382 Default horizontal shift distance is now one-half screen width. 383 384* Horizontal shifting does not shift line numbers if -N is in effect. 385 386* Horizontal shifting acts as though -S were set, to avoid confusion. 387 388====================================================================== 389 390 391 Major changes between "less" versions 352 and 354 392 393* Allow space after numeric-valued command line options. 394 395* Fix problem with configuring terminal libraries on some systems. 396 397* Add support for PCRE regular expression library. 398 399* Add --with-regex option to configure to allow manually selecting 400 a regular expression library. 401 402* Fix bug compiling with SECURE = 1. 403 404====================================================================== 405 406 407 Major changes between "less" versions 346 and 352 408 409* Enable UTF-8 if "UTF-8" appears in locale-related environment variables. 410 411* Add --with-editor option to configure script. 412 413* The -M prompt and = message now show the top and bottom line number. 414 415* Fix bug in running the editor on a file whose name contains quotes, etc. 416 417* Fix bug in horizontal scrolling of long lines. 418 419* Fix bug in doing :d on a file which contains marks. 420 421* Fix bug causing cleared lines to sometimes be filled with standout, 422 bold, underline, etc. on certain terminals. 423 424* Fixes for MS-DOS (DJGPP) version. 425 426====================================================================== 427 428 429 Major changes between "less" versions 340 and 346 430 431* The UTF-8 character set is now supported. 432 433* The default character set is now latin1 rather than ascii. 434 435* New option -R (--RAW-CONTROL-CHARS) is like -r but handles 436 long (wrapped) lines correctly, as long as the input contains only 437 normal text and ANSI color escape sequences. 438 439* New option -F (--quit-if-one-screen) quits if the text fits on 440 the first screen. 441 442* The -w option now highlights the target line of a g or p command. 443 444* A system-wide lesskey file is supported (LESSKEY_SYSTEM). 445 446* New escape for prompt strings: %c is replaced by column number. 447 448* New escape for prompt strings: %P is replaced by percentage into 449 file, based on line number rather than byte offset. 450 451* HOME and END keys now jump to beginning of file or end of file. 452 453====================================================================== 454 455 456 Major changes between "less" versions 337 and 340 457 458* Command line options for less may now be given in either the old 459 single-letter form, or a new long name form (--option-name). 460 See the less man page or "less --help" for the list of long option names. 461 462* Command line options for lesskey may now be given in a new long name 463 form. See the lesskey man page for the list of long option names. 464 465* New command -- toggles an option using the long option name. 466 467* New command __ queries an option using the long option name. 468 469* The old -- command is renamed as -!. 470 471* If a ^P is entered between the dash and the option letter of the - 472 command, the message describing the new setting is suppressed. 473 474* Lesskey files may now contain \k escape sequences to represent the 475 "special" keys (arrows, PAGE-UP/PAGE-DOWN, HOME, END, INSERT, DELETE). 476 477* New command :d removes the current file from the list of files. 478 479* New option -~ (like -w before version 335) 480 suppresses tildes after end-of-file. 481 482* Less is now released under the GNU General Public License. 483 484====================================================================== 485 486 487 Major changes between "less" versions 335 and 337 488 489* Fixed bugs in "make install". 490 491====================================================================== 492 493 494 Major changes between "less" versions 332 and 335 495 496* The old -w flag (suppress tildes after end-of-file) has been removed. 497 498* New -w flag highlights the first new line after a forward-screen. 499 500* New -W flag highlights the first new line after any forward movement. 501 502* Window resize works even if LINES and/or COLUMNS environment 503 variables are incorrect. 504 505* New percent escapes for prompt strings: 506 %d is replaced by the page number, and 507 %D is replaced by the number of pages in the file. 508 509* Added charsets "iso8859" and "ebcdic". 510 511* In Windows version, uses HOMEDRIVE and HOMEPATH if HOME is not defined. 512 513* Fixed some bugs causing incorrect display on DOS/Windows. 514 515====================================================================== 516 517 518 Major changes between "less" versions 330 and 332 519 520* Filenames from the command line are entered into the command history, 521 so UPARROW/DOWNARROW can be used to retrieve them from the :e command. 522 523* Now works correctly on Windows when using a scrolling terminal 524 window (buffer larger than display window). 525 526* On Windows, now restores the console screen on exit. 527 Use -X to get the old behavior. 528 529* Fixed bug on Windows when CAPS-LOCK or NUM-LOCK is pressed. 530 531* Fixed bug on Windows when piping output of an interactive program. 532 533* Fixed bug in tags file processing when tags file has DOS-style 534 line terminators (CR/LF). 535 536* Fixed compilation problem on OS/2. 537 538====================================================================== 539 540 541 Major changes between "less" versions 321 and 330 542 543* Now supports filenames containing spaces (in double quotes). 544 New option -" can be used to change the quoting characters. 545 546* In filename completion, a slash is appended to a directory name. 547 If the environment variable LESSSEPARATOR is set, the value of 548 that variable, rather than a slash, is appended. 549 550* LeftArrow and RightArrow are same as ESC-[ and ESC-]. 551 552* Added commands ESC-( and ESC-), same as ESC-[ and ESC-]. 553 554* A "quit" command defined in a lesskey file may now have an "extra" 555 string, which is used to return an exit code from less when it quits. 556 557* New environment variables LESSMETACHARS and LESSMETAESCAPE provide 558 more control over how less interfaces to the shell. 559 560* Ported to Microsoft Visual C compiler for Windows. 561 562* Ported to DJGPP compiler for MS-DOS. 563 564* Bug fixes. 565 566====================================================================== 567 568 569 Major changes between "less" versions 291 and 321 570 571* Command line at bottom of screen now scrolls, so it can be longer 572 than the screen width. 573 574* New commands ESC-] and ESC-[ scroll the display horizontally. 575 576* New command ESC-SPACE scrolls forward a full screen, even if it 577 hits end-of-file. 578 579* Alternate modifiers for search commands: ^N is same as !, 580 ^F is same as @, and ^E is same as *. 581 582* New modifier for search commands: ^K means highlight the matches 583 currently on-screen, but don't move to the first match. 584 585* New modifier for search commands: ^R means don't use regular 586 expressions in the search. 587 588* Environment variable LESSKEY gives name of default lesskey file. 589 590* Environment variable LESSSECURE will force less to run in 591 "secure" mode. 592 593* Command line argument "--" signals that the rest of the arguments 594 are files (not option flags). 595 596* Help file (less.hlp) is no longer installed. Help text is now 597 embedded in the less executable itself. 598 599* Added -Ph to change the prompt for the help text. 600 Added -Ps to change the default short prompt (same as plain -P). 601 602* Ported to the Borland C compiler for MS-DOS. 603 604* Ported to Windows 95 & Windows NT. 605 606* Ported to OS-9. 607 608* Ported to GNU Hurd. 609 610====================================================================== 611 612 613 Major changes between "less" versions 290 and 291 614 615* Less environment variables can be specified in lesskey files. 616 617* Fixed MS-DOS build. 618 619====================================================================== 620 621 622 Major changes between "less" versions 278 and 290 623 624* Accepts GNU-style options "--help" and "--version". 625 626* OS/2 version looks for less.ini in $HOME before $INIT and $PATH. 627 628* Bug fixes 629 630====================================================================== 631 632 633 Major changes between "less" versions 252 and 278 634 635* A LESSOPEN preprocessor may now pipe the converted file data to less, 636 rather than writing it to a temporary file. 637 638* Search pattern highlighting has been fixed. It now highlights 639 reliably, even if a string is split across two screen lines, 640 contains TABs, etc. 641 642* The -F flag (which suppress search highlighting) has been changed 643 to -G. A new flag, -g, changes search highlighting to highlight 644 only the string found by the last search command, instead of all 645 strings which match the last search command. 646 647* New flag -I acts like -i, but ignores case even if the search 648 pattern contains uppercase letters. 649 650* Less now checks for the environment variable VISUAL before EDITOR. 651 652* Ported to OS/2. 653 654====================================================================== 655 656 657 Major changes between "less" versions 237 and 252 658 659* Changes in line-editing keys: 660 The literal key is now ^V or ^A rather than \ (backslash). 661 Filename completion commands (TAB and ^L) are disabled 662 when typing a search pattern. 663 664* Line-editing command keys can be redefined using lesskey. 665 666* Lesskey with no input file defaults to $HOME/.lesskey 667 rather than standard input. 668 669* New option -V displays version number of less. 670 671* New option -V displays version number of lesskey. 672 673* Help file less.hlp is now installed by default in /usr/local/share 674 rather than /usr/local/lib. 675 676 677====================================================================== 678 679 680 Major changes between "less" versions 170 and 237 681 682* By popular demand, text which matches the current search pattern 683 is highlighted. New -F flag disables this feature. 684 685* Henry Spencer's regexp.c is now included, for systems which do not 686 have a regular expression library. 687 regexp.c is Copyright (c) 1986 by University of Toronto. 688 689* New line-editing keys, including command history (arrow keys) and 690 filename completion (TAB). 691 692* Input preprocessor allows modification of input files (e.g. uncompress) 693 via LESSOPEN/LESSCLOSE environment variables. 694 695* New -X flag disables sending termcap "ti" and "te" (initialize and 696 deinitialize) strings to the terminal. 697 698* Changing -i from within less now correctly affects a subsequent 699 repeated search. 700 701* Searching for underlined or overstruck text now works when the -u 702 flag is in effect, rather than the -i flag. 703 704* Use setlocale (LANG and LC_CTYPE environment variables) to determine 705 the character set if LESSCHARSET/LESSCHARDEF are not set. 706 707* The default format for displaying binary characters is now standout 708 (reverse video) rather than blinking. This can still be changed by 709 setting the LESSBINFMT environment variable. 710 711* Use autoconf installation technology. 712 713* Ported to MS-DOS. 714 715 ******************************** 716 Things that may surprise you 717 ******************************** 718 719* When you enter text at the bottom of the screen (search string, 720 filename, etc.), some keys act different than previously. 721 Specifically, \ (backslash), ESC, TAB, BACKTAB, and control-L 722 now have line editing functions. 723 724* Some previous unofficial versions of less were able to display 725 compressed files. The new LESSOPEN/LESSCLOSE feature now provides 726 this functionality in a different way. 727 728* Some previous unofficial versions of less provided a -Z flag to 729 set the number of lines of text to retain between full screen scrolls. 730 The -z-n flag (that is, -z with a negative number) provides this 731 functionality. 732 733 734====================================================================== 735 736 737 Major changes between "less" versions 123 and 170 738 739* New option -j allows target lines to be positioned anywhere on screen. 740 741* New option -S truncates displayed line at the screen width, 742 rather than wrapping onto the next line. 743 744* New option -y limits amount of forward scroll. 745 746* New option -T specifies a "tags" file. 747 748* Non-printable, non-control characters are displayed in octal. 749 Such characters, as well as control characters, are displayed 750 in blinking mode. 751 752* New command -+ sets an option to its default. 753* New command -- sets an option to the opposite of its default. 754 755* Lesskey file may have a string appended to a key's action, 756 which acts as though typed in after the command. 757 758* New commands ESC-^F and ESC-^B match arbitrary types of brackets. 759 760* New command F monitors a growing file (like "tail -f"). 761 762* New command | pipes a section of the input file into a shell command. 763 764* New command :x directly jumps to a file in the command line list. 765 766* Search commands have been enhanced and reorganized: 767 n Repeat search, same direction. 768 N Repeat search, opposite direction. 769 ESC-/ Search forward thru file boundaries 770 ESC-? Search backward thru file boundaries 771 ESC-n Repeat search thru file boundaries, same direction. 772 ESC-N Repeat search thru file boundaries, opposite direction. 773 Special character * causes search to search thru file boundaries. 774 Special character @ causes search to begin at start/end of file list. 775 776* Examining a new file adds it to the command line list. 777 A list of files, or an expression which matches more than one file, 778 may be examined; all of them are added to the command line list. 779 780* Environment variables LESSCHARSET and LESSCHARDEF can define 781 a non-ASCII character set. 782 783* Partial support for MSDOS, including options -R for repainting screen 784 on quit, -v/-V to select video mode, and -W to change window size. 785 786 787====================================================================== 788 789 790 Major changes between "less" versions 97 and 123 791 792* New option (-N) causes line numbers to be displayed in the 793 text of the file (like vi "set nu"). 794 795* New option (-?) prints help message immediately. 796 797* New option (-r) displays "raw" control characters, without 798 mapping them to ^X notation. 799 800* New option (-f) forces less to open non-regular files 801 (directories, etc). 802 803* New option (-k) can be used to specify lesskey files by name. 804 805* New option (-y) can be used to set a forward scroll limit 806 (like -h sets a backward scroll limit). 807 808* File marks (set by the m command) are now preserved when a new 809 file is edited. The ' command can thus be used to switch files. 810 811* New command ESC-/ searches all files (on the command line) 812 for a pattern. 813 814* New command ESC-n repeats previous search, spanning files. 815 816* The N command has been changed to repeat the previous search 817 in the reverse direction. The old N command is still available 818 via :n. 819 820* New command ESC-N repeats previous search in the reverse 821 direction and spanning files. 822 823* 8 bit characters are now supported. A new option (-g) can be 824 used to strip off the eighth bit (the previous behavior). 825 826* Options which take a following string (like -t) may now 827 optionally have a space between the option letter and the string. 828 829* Six new commands { } ( ) [ and ] can be used to match 830 brackets of specific types, similar to vi % command. 831 832* New commands z and w move forward/backward one window and 833 simultaneously set the window size. 834 835* Prompt string expansion now has %L for line number of the last 836 line in the file, and %E for the name of the editor. 837 Also, % escapes which refer to a line (b=bottom, t=top, etc.) 838 can use j for the jump target line. 839 840* New environment variable LESSEDIT can be used to tailor the 841 command string passed to the editor by the v command. 842 843* Examining a file which was previously examined will return 844 to the same position in the file. 845 846* A "%" is expanded to the current filename and a "#" to the 847 previous filename, in both shell commands and the E command. 848 (Previously % worked only in shell commands and # worked 849 only in the E command.) 850 851* New command ":ta" is equivalent to "-t". 852 853* New command "s" is equivalent to "-l". 854 855* The - command may be followed by "+X" to revert to the default 856 for option X, or "-X" to get the opposite of the default. 857 858* Lesskey files may now include characters after the action as 859 extra input to be parsed after the action; for example: 860 "toggle-option X" to toggle a specific option X. 861 862 863 864 865 866