NAME
printenv, env
— print out the environment, set
and print environment
SYNOPSIS
printenv |
[name] |
env |
[-] [-i]
[name=value ...]
[utility [argument ...]] |
DESCRIPTION
Theprintenv utility prints out the names and values of
the variables in the environment, with one name/value pair per line. If
name is specified, only its value is printed.
Some shells may provide a builtin printenv
command which is similar or identical to this utility. Consult the
builtin(1) manual page.
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
envis ignored completely. -- Identical to the
-ioption, available for backward compatibility.
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.
EXIT STATUS
The printenv utility exits 0 on
success, and >0 if an error occurs.
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.
SEE ALSO
STANDARDS
The env utility conforms to
IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The printenv command appeared in
3.0BSD.
BUGS
The env utility doesn't handle utility
arguments with equal (``='') signs in their names, for obvious reasons.