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 i 48.Op Ar name Ns = Ns Ar value ... 49.Op Ar utility Oo Ar argument ... Oc 50.Sh DESCRIPTION 51The 52.Nm 53utility prints 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 60Some shells may provide a builtin 61.Nm 62command which is similar or identical to this utility. 63Consult the 64.Xr builtin 1 65manual page. 66.Pp 67The 68.Nm env 69utility executes 70.Ar utility 71after modifying the environment as 72specified on the command line. 73The option 74.Ar name Ns = Ns Ar value 75specifies 76an environment variable, 77.Ar name , 78with a value of 79.Ar value . 80.Pp 81The options are as follows: 82.Bl -tag -width indent 83.It Fl i 84Execute the 85.Ar utility 86with only those environment values specified. 87The environment inherited 88by 89.Nm env 90is ignored completely. 91.El 92.Pp 93If no utility is specified, 94.Nm env 95prints out the names and values 96of the variables in the environment, with one name/value pair per line. 97.Pp 98The 99.Nm env 100utility is sometimes useful with the 101.Dq Li #! 102construct (see 103.Xr execve 2 ) . 104The only difference between 105.Dq Li #!/usr/local/bin/foo 106and 107.Dq Li "#!/usr/bin/env\ /usr/local/bin/foo" 108is that the latter works even if 109.Pa /usr/local/bin/foo 110is itself interpreted. 111Using 112.Nm env 113this way also allows one to reference 114.Pa foo 115without the path, 116as well as set up the environment as desired. 117.Sh ENVIRONMENT 118The 119.Nm env 120utility uses the 121.Ev PATH 122environment variable is used to locate the requested 123.Ar utility 124if the name contains no 125.Ql / 126characters. 127.Sh DIAGNOSTICS 128.Ex -std printenv 129.Pp 130.Ex -std env 131An exit status of 126 indicates 132.Ar utility 133was found, but could not be executed. 134An exit status of 127 indicates 135.Ar utility 136could not be found. 137.Sh COMPATIBILITY 138The 139.Nm env 140utility accepts the 141.Fl 142option as a synonym for 143.Fl i . 144.Sh SEE ALSO 145.Xr csh 1 , 146.Xr sh 1 , 147.Xr execvp 3 , 148.Xr environ 7 149.Sh STANDARDS 150The 151.Nm env 152utility conforms to 153.St -p1003.1-2001 . 154.Sh HISTORY 155The 156.Nm 157command appeared in 158.Bx 3.0 . 159.Sh BUGS 160The 161.Nm env 162utility doesn't handle utility arguments with equal (``='') signs in their 163names, for obvious reasons. 164