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env, printenv - Displays or sets the current environment, or displays the
values of environment variables
env [-i] [name=value...] [command] [args...]
env [-] [name=value...] [command] [args...]
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
-i Invokes utility with exactly the environment specified by the
arguments; the inherited environment is ignored completely. Changes
are in effect only while the specified command is running.
- Dash is equivalent to -i option.
Changes in the form name=value are added to the current environment
before the command is run.
[Tru64 UNIX] Name of an environment variable to be printed.
Name of a command to be invoked with the modified environment.
Arguments to be passed to command when it is executed.
The env command lets you get and change your current environment, and then
run the specified command with the changed environment. If the -i option
is used, the current environment is ignored and the command runs with only
the changed environment. Changes are only in effect while the specified
command is running.
If command is not specified, env displays your current environment, one
name=value pair per line.
[Tru64 UNIX] The printenv command displays the values of the variables in
the environment. If name is specified, only its value is printed. If name
is not the name of a currently set environment variable, only a blank line
is printed, no error is reported. If name is not specified, printenv
displays the current environment, one name=value per line.
If command is invoked, the exit status of env is the exit status of
command; otherwise, the env utility exits with one of the following values:
0 The env utility completed successfully.
An error occurred in the env utility.
126 The command specified by command was found but could not be invoked.
127 The command specified by command could not be found.
1. To add a shell variable to the environment for the duration of one
command (sh only), enter:
env TZ=MST7MDT date
Each of these commands displays the current date and time in Mountain
Standard Time. The two commands shown are equivalent. When date is
finished, the previous value of TZ takes effect again.
2. To replace the environment with another one, enter:
env -i PATH=$PATH IDIR=/u/jim/include LIBDIR=/u/jim/lib make
This runs make in an environment that consists only of these
definitions for PATH, IDIR, and LIBDIR. You must redefine PATH so
that the shell can find the make command.
When make is finished, the previous environment takes effect again.
3. To find the current setting of the TERM environment variable, enter:
The command returns the value for the TERM environment variable.
The following environment variables affect the execution of env:
Provides a default value for the internationalization variables that
are unset or null. If LANG is unset or null, the corresponding value
from the default locale is used. If any of the internationalization
variables contain an invalid setting, the utility behaves as if none of
the variables had been defined.
If set to a non-empty string value, overrides the values of all the
other internationalization variables.
Determines the locale for the interpretation of sequences of bytes of
text data as characters (for example, single-byte as opposed to
multibyte characters in arguments).
Determines the locale for the format and contents of diagnostic
messages written to standard error.
Determines the location of message catalogues for the processing of
Commands: csh(1), ksh(1), Bourne shell sh(1b), POSIX shell sh(1p)
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