1.\"/* Copyright 1988,1990,1993 by Paul Vixie 2.\" * All rights reserved 3.\" * 4.\" * Distribute freely, except: don't remove my name from the source or 5.\" * documentation (don't take credit for my work), mark your changes (don't 6.\" * get me blamed for your possible bugs), don't alter or remove this 7.\" * notice. May be sold if buildable source is provided to buyer. No 8.\" * warrantee of any kind, express or implied, is included with this 9.\" * software; use at your own risk, responsibility for damages (if any) to 10.\" * anyone resulting from the use of this software rests entirely with the 11.\" * user. 12.\" * 13.\" * Send bug reports, bug fixes, enhancements, requests, flames, etc., and 14.\" * I'll try to keep a version up to date. I can be reached as follows: 15.\" * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul 16.\" */ 17.\" 18.\" $FreeBSD$ 19.\" 20.Dd December 20, 2016 21.Dt CRONTAB 1 22.Os 23.Sh NAME 24.Nm crontab 25.Nd maintain crontab files for individual users (V3) 26.Sh SYNOPSIS 27.Nm 28.Op Fl u Ar user 29.Ar file 30.Nm 31.Op Fl u Ar user 32{ 33.Fl l | 34.Fl r Op Fl f 35| 36.Fl e 37} 38.Sh DESCRIPTION 39The 40.Nm 41utility is the program used to install, deinstall or list the tables 42used to drive the 43.Xr cron 8 44daemon in Vixie Cron. 45Each user can have their own crontab, and though 46these are files in 47.Pa /var , 48they are not intended to be edited directly. 49.Pp 50If the 51.Pa allow 52file exists, then you must be listed therein in order to be allowed to use 53this command. 54If the 55.Pa allow 56file does not exist but the 57.Pa deny 58file does exist, then you must 59.Em not 60be listed in the 61.Pa deny 62file in order to use this command. 63If neither of these files exists, then 64depending on site-dependent configuration parameters, only the super user 65will be allowed to use this command, or all users will be able to use this 66command. 67The format of these files is one username per line, 68with no leading or trailing whitespace. 69Lines of other formats will be ignored, 70and so can be used for comments. 71.Pp 72The first form of this command is used to install a new crontab from some 73named file or standard input if the pseudo-filename 74.Sq Fl 75is given. 76.Pp 77The following options are available: 78.Bl -tag -width indent 79.It Fl u 80Specify the name of the user whose crontab is to be 81tweaked. 82If this option is not given, 83.Nm 84examines 85.Dq your 86crontab, i.e., the crontab of the person executing the 87command. 88Note that 89.Xr su 1 90can confuse 91.Nm 92and that if you are running inside of 93.Xr su 1 94you should always use the 95.Fl u 96option for safety's sake. 97.It Fl l 98Display the current crontab on standard output. 99.It Fl r 100Remove the current crontab. 101By default the 102.Fl r 103option prompts for confirmation, adding the 104.Fl f 105option will attempt to remove the current crontab without confirmation. 106.It Fl e 107Edit the current crontab using the editor specified by 108the 109.Ev VISUAL 110or 111.Ev EDITOR 112environment variables. 113The specified editor 114.Em must 115edit the file in place; 116any editor that unlinks the file and recreates it cannot be used. 117After you exit 118from the editor, the modified crontab will be installed automatically. 119.El 120.Sh FILES 121.Bl -tag -width /var/cron/allow -compact 122.It Pa /var/cron/allow 123List of users allowed to use crontab 124.It Pa /var/cron/deny 125List of users prohibited from using crontab 126.It Pa /var/cron/tabs 127Directory for personal crontab files 128.El 129.Sh DIAGNOSTICS 130A fairly informative usage message appears if you run it with a bad command 131line. 132.Sh SEE ALSO 133.Xr crontab 5 , 134.Xr cron 8 135.Sh STANDARDS 136The 137.Nm 138command conforms to 139.St -p1003.2 140with the exception that the dangerous variant of calling 141.Nm 142without a file name in the first form of the command is not allowed by 143this implementation. 144The pseudo-filename 145.Sq Fl 146must be specified to read from standard input. 147The new command syntax 148differs from previous versions of Vixie Cron, as well as from the classic 149SVR3 syntax. 150.Sh AUTHORS 151.An Paul Vixie Aq Mt paul@vix.com 152