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 1.2 2003/06/17 04:29:30 dillon Exp $ 37.\" 38.Dd June 6, 1993 39.Dt PRINTENV 1 40.Os 41.Sh NAME 42.Nm printenv , env 43.Nd print out the environment, set and print environment 44.Sh SYNOPSIS 45.Nm 46.Op Ar name 47.Nm env 48.Op Fl 49.Op Fl i 50.Op Ar name Ns = Ns Ar value ... 51.Op Ar utility Oo Ar argument ... Oc 52.Sh DESCRIPTION 53The 54.Nm 55utility prints out the names and values of the variables in the environment, 56with one name/value pair per line. 57If 58.Ar name 59is specified, only 60its value is printed. 61.Pp 62Some shells may provide a builtin 63.Nm 64command which is similar or identical to this utility. 65Consult the 66.Xr builtin 1 67manual page. 68.Pp 69The 70.Nm env 71utility executes 72.Ar utility 73after modifying the environment as 74specified on the command line. 75The option 76.Ar name Ns = Ns Ar value 77specifies 78an environment variable, 79.Ar name , 80with a value of 81.Ar value . 82.Pp 83The options are as follows: 84.Bl -tag -width indent 85.It Fl i 86Execute the 87.Ar utility 88with only those environment values specified. 89The environment inherited 90by 91.Nm env 92is ignored completely. 93.It Fl 94Identical to the 95.Fl i 96option, available for backward compatibility. 97.El 98.Pp 99If no utility is specified, 100.Nm env 101prints out the names and values 102of the variables in the environment, with one name/value pair per line. 103.Pp 104The 105.Nm env 106utility is sometimes useful with the 107.Dq Li #! 108construct (see 109.Xr execve 2 ) . 110The only difference between 111.Dq Li #!/usr/local/bin/foo 112and 113.Dq Li "#!/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 DIAGNOSTICS 124.Ex -std printenv 125.Pp 126.Ex -std env 127An exit status of 126 indicates 128.Ar utility 129was found, but could not be executed. 130An exit status of 127 indicates 131.Ar utility 132could not be found. 133.Sh SEE ALSO 134.Xr csh 1 , 135.Xr sh 1 , 136.Xr execvp 3 , 137.Xr environ 7 138.Sh STANDARDS 139The 140.Nm env 141utility conforms to 142.St -p1003.1-2001 . 143.Sh HISTORY 144The 145.Nm 146command appeared in 147.Bx 3.0 . 148.Sh BUGS 149The 150.Nm env 151utility doesn't handle utility arguments with equal (``='') signs in their 152names, for obvious reasons. 153