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