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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)printenv.1 8.1 (Berkeley) 6/6/93 31.\" $FreeBSD: src/usr.bin/printenv/printenv.1,v 1.6.2.10 2002/06/26 08:25:30 tjr Exp $ 32.\" $DragonFly: src/usr.bin/printenv/printenv.1,v 1.3 2005/08/05 22:35:11 swildner Exp $ 33.\" 34.Dd June 6, 1993 35.Dt PRINTENV 1 36.Os 37.Sh NAME 38.Nm printenv , 39.Nm env 40.Nd print out the environment, set and print environment 41.Sh SYNOPSIS 42.Nm 43.Op Ar name 44.Nm env 45.Op Fl 46.Op Fl i 47.Op Ar name Ns = Ns Ar value ... 48.Op Ar utility Oo Ar argument ... Oc 49.Sh DESCRIPTION 50The 51.Nm 52utility prints out the names and values of the variables in the environment, 53with one name/value pair per line. 54If 55.Ar name 56is specified, only 57its value is printed. 58.Pp 59Some shells may provide a builtin 60.Nm 61command which is similar or identical to this utility. 62Consult the 63.Xr builtin 1 64manual page. 65.Pp 66The 67.Nm env 68utility executes 69.Ar utility 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 utility 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 utility 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 101The 102.Nm env 103utility is sometimes useful with the 104.Dq Li #! 105construct (see 106.Xr execve 2 ) . 107The only difference between 108.Dq Li #!/usr/local/bin/foo 109and 110.Dq Li "#!/usr/bin/env\ /usr/local/bin/foo" 111is that the latter works even if 112.Pa /usr/local/bin/foo 113is itself interpreted. 114Using 115.Nm env 116this way also allows one to reference 117.Pa foo 118without the path, 119as well as set up the environment as desired. 120.Sh EXIT STATUS 121.Ex -std printenv 122.Pp 123.Ex -std env 124An exit status of 126 indicates 125.Ar utility 126was found, but could not be executed. 127An exit status of 127 indicates 128.Ar utility 129could not be found. 130.Sh SEE ALSO 131.Xr csh 1 , 132.Xr sh 1 , 133.Xr execvp 3 , 134.Xr environ 7 135.Sh STANDARDS 136The 137.Nm env 138utility conforms to 139.St -p1003.1-2001 . 140.Sh HISTORY 141The 142.Nm 143command appeared in 144.Bx 3.0 . 145.Sh BUGS 146The 147.Nm env 148utility doesn't handle utility arguments with equal (``='') signs in their 149names, for obvious reasons. 150