env, printenv - Displays or sets the current environment,
or displays the values of environment variables
Current Syntax
env [-i] [name=value...] [command] [args...]
printenv [name]
Obsolescent Syntax [Toc] [Back]
env [-] [name=value...] [command] [args...]
Interfaces documented on this reference page conform to
industry standards as follows:
env: XCU5.0
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
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: The env utility completed
successfully. An error occurred in the env utility. The
command specified by command was found but could not be
invoked. The command specified by command could not be
found.
To add a shell variable to the environment for the duration
of one command (sh only), enter: TZ=MST7MDT date 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. 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. To find the current setting of
the TERM environment variable, enter: printenv TERM
The command returns the value for the TERM environment
variable.
ENVIRONMENT VARIABLES [Toc] [Back] 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 LC_MESSAGES.
Commands: csh(1), ksh(1), Bourne shell sh(1b), POSIX
shell sh(1p)
Functions: exec(2)
Standards: standards(5)
env(1)
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