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@(#)printenv.1 8.1 (Berkeley) 6/6/93
$FreeBSD: head/usr.bin/printenv/printenv.1 98968 2002-06-28 09:23:39Z tjr $
.Dd June 6, 1993 .Dt PRINTENV 1 .Os .Sh NAME .Nm printenv , env .Nd print out the environment, set and print environment .Sh SYNOPSIS .Nm .Op Ar name .Nm env .Op Fl i .Op Ar name Ns = Ns Ar value ... .Op Ar utility Oo Ar argument ... Oc .Sh DESCRIPTION The .Nm utility prints out the names and values of the variables in the environment, with one name/value pair per line. If .Ar name is specified, only its value is printed.
p Some shells may provide a builtin .Nm command which is similar or identical to this utility. Consult the .Xr builtin 1 manual page.
p The .Nm env utility executes .Ar utility after modifying the environment as specified on the command line. The option .Ar name Ns = Ns Ar value specifies an environment variable, .Ar name , with a value of .Ar value .
p The options are as follows: l -tag -width indent t Fl i Execute the .Ar utility with only those environment values specified. The environment inherited by .Nm env is ignored completely. .El
p If no utility is specified, .Nm env prints out the names and values of the variables in the environment, with one name/value pair per line.
p The .Nm env utility is sometimes useful with the .Dq Li #! construct (see .Xr execve 2 ) . The only difference between .Dq Li #!/usr/local/bin/foo and .Dq Li "#!/usr/bin/env /usr/local/bin/foo" is that the latter works even if
a /usr/local/bin/foo is itself interpreted. Using .Nm env this way also allows one to reference
a foo without the path, as well as set up the environment as desired. .Sh DIAGNOSTICS .Ex -std printenv
p .Ex -std env An exit status of 126 indicates .Ar utility was found, but could not be executed. An exit status of 127 indicates .Ar utility could not be found. .Sh COMPATIBILITY The .Nm env utility accepts the .Fl option as a synonym for .Fl i . .Sh SEE ALSO .Xr csh 1 , .Xr sh 1 , .Xr execvp 3 , .Xr environ 7 .Sh STANDARDS The .Nm env utility conforms to .St -p1003.1-2001 . .Sh HISTORY The .Nm command appeared in x 3.0 . .Sh BUGS The .Nm env utility doesn't handle utility arguments with equal (``='') signs in their names, for obvious reasons.