env

(1)

run a program in a modified environment

User commands 13 optionscoreutils 9.7-3

env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]

Options

-a--argv0ARG

pass ARG as the zeroth argument of COMMAND

-i--ignore-environment

start with an empty environment

-0--null

end each output line with NUL, not newline

-u--unsetNAME

remove variable from the environment

-C--chdirDIR

change working directory to DIR

-S--split-stringS

process and split S into separate arguments; used to pass multiple arguments on shebang lines

--block-signalSIG

block delivery of SIG signal(s) to COMMAND

--default-signalSIG

reset handling of SIG signal(s) to the default

--ignore-signalSIG

set handling of SIG signal(s) to do nothing

--list-signal-handling

list non default signal handling to stderr

-v--debug

print verbose information for each processing step

--help

display this help and exit

--version

output version information and exit

DESCRIPTION

Set each NAME to VALUE in the environment and run COMMAND.

Mandatory arguments to long options are mandatory for short options too.

-a, --argv0=ARG: pass ARG as the zeroth argument of COMMAND
-i, --ignore-environment: start with an empty environment
-0, --null: end each output line with NUL, not newline
-u, --unset=NAME: remove variable from the environment
-C, --chdir=DIR: change working directory to DIR
-S, --split-string=S: process and split S into separate arguments; used to pass multiple arguments on shebang lines
--block-signal[=SIG]: block delivery of SIG signal(s) to COMMAND
--default-signal[=SIG]: reset handling of SIG signal(s) to the default
--ignore-signal[=SIG]: set handling of SIG signal(s) to do nothing
--list-signal-handling: list non default signal handling to stderr
-v, --debug: print verbose information for each processing step
--help: display this help and exit
--version: output version information and exit

A mere - implies -i. If no COMMAND, print the resulting environment.

SIG may be a signal name like 'PIPE', or a signal number like '13'. Without SIG, all known signals are included. Multiple signals can be comma-separated. An empty SIG argument is a no-op.

Exit status:

125: if the env command itself fails
126: if COMMAND is found but cannot be invoked
127: if COMMAND cannot be found
-: the exit status of COMMAND otherwise

NOTES

POSIX's exec(3p) pages says:

"many existing applications wrongly assume that they start with certain signals set to the default action and/or unblocked.... Therefore, it is best not to block or ignore signals across execs without explicit reason to do so, and especially not to block signals across execs of arbitrary (not closely cooperating) programs."

AUTHOR

Written by Richard Mlynarik, David MacKenzie, and Assaf Gordon.

REPORTING BUGS

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