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 60If a 61.Ar name 62is specified and it is not defined in the environment, 63.Nm 64returns exit status 1, else it returns status 0. 65.Pp 66Some shells may provide a builtin 67.Nm 68command which is similar or identical to this utility. 69Consult the 70.Xr builtin 1 71manual page. 72.Pp 73.Nm Env 74executes 75.Ar command 76after modifying the environment as 77specified on the command line. 78The option 79.Ar name Ns = Ns Ar value 80specifies 81an environment variable, 82.Ar name , 83with a value of 84.Ar value . 85.Pp 86The options are as follows: 87.Bl -tag -width indent 88.It Fl i 89Execute the 90.Ar command 91with only those environment values specified. 92The environment inherited 93by 94.Nm env 95is ignored completely. 96.It Fl 97Identical to the 98.Fl i 99option, available for backward compatibility. 100.El 101.Pp 102If no command is specified, 103.Nm env 104prints out the names and values 105of the variables in the environment, with one name/value pair per line. 106.Pp 107.Nm env 108is sometimes useful with the 109.Dq Li #! 110construct (see 111.Xr execve 2 ) . 112The only difference between 113.Dq Li #!/usr/local/bin/foo 114and 115.Dq Li "#!/usr/bin/env\ /usr/local/bin/foo" 116is that the latter works even if 117.Pa /usr/local/bin/foo 118is itself interpreted. 119Using 120.Nm env 121this way also allows one to reference 122.Pa foo 123without the path, 124as well as set up the environment as desired. 125.Sh SEE ALSO 126.Xr csh 1 , 127.Xr sh 1 , 128.Xr execvp 3 , 129.Xr environ 7 130.Sh HISTORY 131The 132.Nm 133command appeared in 134.Bx 3.0 . 135.Sh BUGS 136.Nm Env 137doesn't handle commands with equal (``='') signs in their 138names, for obvious reasons. 139