env -- set and print environment
env [-i] [name=value ...] [utility [argument ...]]
The env utility executes utility after modifying the environment as specified
on the command line. The option name=value specifies an environment
variable, name, with a value of value.
The options are as follows:
-i Execute the utility with only those environment values specified.
The environment inherited by env is ignored completely.
If no utility is specified, env prints out the names and values of the
variables in the environment, with one name/value pair per line.
The env utility is sometimes useful with the ``#!'' construct (see
execve(2)). The only difference between ``#!/usr/local/bin/foo'' and
``#!/usr/bin/env /usr/local/bin/foo'' is that the latter works even if
/usr/local/bin/foo is itself interpreted. Using env this way also allows
one to reference foo without the path, as well as set up the environment
as desired.
The env utility uses the PATH environment variable is used to locate the
requested utility if the name contains no `/' characters.
The env utility exits 0 on success, and >0 if an error occurs. An exit
status of 126 indicates utility was found, but could not be executed. An
exit status of 127 indicates utility could not be found.
The env utility accepts the - option as a synonym for -i.
printenv(1), sh(1), execvp(3), environ(7)
The env utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
The env utility doesn't handle utility arguments with equal (``='') signs
in their names, for obvious reasons.
FreeBSD 5.2.1 May 12, 2003 FreeBSD 5.2.1 [ Back ] | 