env(1) manual page
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env - set environment for command invocation
/usr/bin/env
[-i | -] [name=value] ... [utility [ arg ...]]
/usr/xpg4/bin/env [-i | -] [name=value]
... [utility [ arg ...]]
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The env utility obtains the current environment, modifies
it according to its arguments, then invokes the utility named by the utility
operand with the modified environment.
Optional arguments are passed to
utility. If no utility operand is specified, the resulting environment is
written to the standard output, with one name=value pair per line.
If
env executes commands with arguments, it uses the default shell /usr/bin/sh
(see sh(1)
).
If env executes commands with arguments, it
uses the XPG4-compliant shell /usr/xpg4/bin/sh, which is equivalent to /usr/bin/ksh
(see ksh(1)
).
The following options are supported:
- -i | -
- Ignore the
environment that would otherwise be inherited from the current shell. Restricts
the environment for utility to that specified by the arguments.
The
following operands are supported:
- name=value
- Arguments of the form name=value
modify the execution environment, and are placed into the inherited environment
before utility is invoked.
- utility
- The name of the utility to be invoked.
If utility names any of the special shell built-in utilities, the results
are undefined.
- arg
- A string to pass as an argument for the invoked utility.
The following utility:
example% env -i PATH=/mybin mygrep xyz myfile
invokes the utility mygrep with a new PATH
value as the only entry in
its environment. In this case, PATH
is used to locate mygrep, which then
must reside in /mybin.
See environ(5)
for descriptions of the
following environment variables that affect the execution of env: LC_CTYPE
,
LC_MESSAGES
, and NLSPATH
.
If utility is invoked, the exit status
of env is the exit status of utility; otherwise, the env utility is with
one of the following values:
- Successful completion.
- 1-125
- An error occurred.
- utility was found but could not be invoked.
- utility could not be found.
ksh(1)
, sh(1)
, exec(2)
, profile(4)
, environ(5)
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