1.\" Copyright (c) 1980, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)printenv.1 8.1 (Berkeley) 6/6/93 35.\" $FreeBSD$ 36.\" 37.Dd June 6, 1993 38.Dt PRINTENV 1 39.Os 40.Sh NAME 41.Nm printenv , env 42.Nd print out the environment, set and print environment 43.Sh SYNOPSIS 44.Nm 45.Op Ar name 46.Nm env 47.Op Fl 48.Op Fl i 49.Op Ar name Ns = Ns Ar value ... 50.Op Ar command 51.Sh DESCRIPTION 52.Nm Printenv 53prints out the names and values of the variables in the environment, 54with one name/value pair per line. 55If 56.Ar name 57is specified, only 58its value is printed. 59.Pp 60Some shells may provide a builtin 61.Nm 62command which is similar or identical to this utility. 63Consult the 64.Xr builtin 1 65manual page. 66.Pp 67.Nm Env 68executes 69.Ar command 70after modifying the environment as 71specified on the command line. 72The option 73.Ar name Ns = Ns Ar value 74specifies 75an environment variable, 76.Ar name , 77with a value of 78.Ar value . 79.Pp 80The options are as follows: 81.Bl -tag -width indent 82.It Fl i 83Execute the 84.Ar command 85with only those environment values specified. 86The environment inherited 87by 88.Nm env 89is ignored completely. 90.It Fl 91Identical to the 92.Fl i 93option, available for backward compatibility. 94.El 95.Pp 96If no command is specified, 97.Nm env 98prints out the names and values 99of the variables in the environment, with one name/value pair per line. 100.Pp 101.Nm env 102is sometimes useful with the 103.Dq Li #! 104construct (see 105.Xr execve 2 ) . 106The only difference between 107.Dq Li #!/usr/local/bin/foo 108and 109.Dq Li "#!/usr/bin/env\ /usr/local/bin/foo" 110is that the latter works even if 111.Pa /usr/local/bin/foo 112is itself interpreted. 113Using 114.Nm env 115this way also allows one to reference 116.Pa foo 117without the path, 118as well as set up the environment as desired. 119.Sh DIAGNOSTICS 120.Ex -std printenv 121.Pp 122.Ex -std env 123An exit status of 126 indicates 124.Ar command 125was found, but could not be executed. 126An exit status of 127 indicates 127.Ar command 128could not be found. 129.Sh SEE ALSO 130.Xr csh 1 , 131.Xr sh 1 , 132.Xr execvp 3 , 133.Xr environ 7 134.Sh STANDARDS 135The 136.Nm env 137utility conforms to 138.St -p1003.1-2001 . 139.Sh HISTORY 140The 141.Nm 142command appeared in 143.Bx 3.0 . 144.Sh BUGS 145.Nm Env 146doesn't handle commands with equal (``='') signs in their 147names, for obvious reasons. 148