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: src/usr.bin/printenv/printenv.1,v 1.6.2.10 2002/06/26 08:25:30 tjr Exp $ 36.\" $DragonFly: src/usr.bin/printenv/printenv.1,v 1.3 2005/08/05 22:35:11 swildner Exp $ 37.\" 38.Dd June 6, 1993 39.Dt PRINTENV 1 40.Os 41.Sh NAME 42.Nm printenv , 43.Nm env 44.Nd print out the environment, set and print environment 45.Sh SYNOPSIS 46.Nm 47.Op Ar name 48.Nm env 49.Op Fl 50.Op Fl i 51.Op Ar name Ns = Ns Ar value ... 52.Op Ar utility Oo Ar argument ... Oc 53.Sh DESCRIPTION 54The 55.Nm 56utility prints out the names and values of the variables in the environment, 57with one name/value pair per line. 58If 59.Ar name 60is specified, only 61its value is printed. 62.Pp 63Some shells may provide a builtin 64.Nm 65command which is similar or identical to this utility. 66Consult the 67.Xr builtin 1 68manual page. 69.Pp 70The 71.Nm env 72utility executes 73.Ar utility 74after modifying the environment as 75specified on the command line. 76The option 77.Ar name Ns = Ns Ar value 78specifies 79an environment variable, 80.Ar name , 81with a value of 82.Ar value . 83.Pp 84The options are as follows: 85.Bl -tag -width indent 86.It Fl i 87Execute the 88.Ar utility 89with only those environment values specified. 90The environment inherited 91by 92.Nm env 93is ignored completely. 94.It Fl 95Identical to the 96.Fl i 97option, available for backward compatibility. 98.El 99.Pp 100If no utility is specified, 101.Nm env 102prints out the names and values 103of the variables in the environment, with one name/value pair per line. 104.Pp 105The 106.Nm env 107utility is sometimes useful with the 108.Dq Li #! 109construct (see 110.Xr execve 2 ) . 111The only difference between 112.Dq Li #!/usr/local/bin/foo 113and 114.Dq Li "#!/usr/bin/env\ /usr/local/bin/foo" 115is that the latter works even if 116.Pa /usr/local/bin/foo 117is itself interpreted. 118Using 119.Nm env 120this way also allows one to reference 121.Pa foo 122without the path, 123as well as set up the environment as desired. 124.Sh EXIT STATUS 125.Ex -std printenv 126.Pp 127.Ex -std env 128An exit status of 126 indicates 129.Ar utility 130was found, but could not be executed. 131An exit status of 127 indicates 132.Ar utility 133could not be found. 134.Sh SEE ALSO 135.Xr csh 1 , 136.Xr sh 1 , 137.Xr execvp 3 , 138.Xr environ 7 139.Sh STANDARDS 140The 141.Nm env 142utility conforms to 143.St -p1003.1-2001 . 144.Sh HISTORY 145The 146.Nm 147command appeared in 148.Bx 3.0 . 149.Sh BUGS 150The 151.Nm env 152utility doesn't handle utility arguments with equal (``='') signs in their 153names, for obvious reasons. 154