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 BSD 3 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=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. If 55.Ar name 56is specified, only 57its value is printed. 58.Pp 59If a 60.Ar name 61is specified and it is not defined in the environment, 62.Nm 63returns exit status 1, else it returns status 0. 64.Pp 65Some shells may provide a builtin 66.Nm 67command which is similar or identical to this utility. 68Consult the 69.Xr builtin 1 70manual page. 71.Pp 72.Nm Env 73executes 74.Ar command 75after modifying the environment as 76specified on the command line. The option 77.Ar name=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 command 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 command 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 105.Nm env 106is sometimes useful with the 107.Qq #! 108construct (see 109.Xr execve 2 ) . 110The only difference between 111.Qq #!/usr/local/bin/foo 112and 113.Qq #!/usr/bin/env /usr/local/bin/foo 114is that the latter works even if 115.Pa /usr/local/bin/foo 116is itself interpreted. 117Using 118.Nm env 119this way also allows one to reference 120.Pa foo 121without the path, 122as well as set up the environment as desired. 123.Sh SEE ALSO 124.Xr csh 1 , 125.Xr sh 1 , 126.Xr execvp 3 , 127.Xr environ 7 128.Sh HISTORY 129The 130.Nm 131command appeared in 132.Bx 3.0 . 133.Sh BUGS 134.Nm Env 135doesn't handle commands with equal (``='') signs in their 136names, for obvious reasons. 137