ENV(1)                        User Commands                        ENV(1)

NAME
       env - run a program in a modified environment

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

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

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

       -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 signals(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 environ‐
       ment.

       SIG may be a signal name like 'PIPE',  or  a  signal  number  like
       '13'.  Without SIG, all known signals are included.  Multiple sig‐
       nals can be comma-separated.

OPTIONS
   -S/--split-string usage in scripts
       The -S option allows specifying multiple parameters in  a  script.
       Running a script named 1.pl containing the following first line:

              #!/usr/bin/env -S perl -w -T
              ...

       Will execute perl -w -T 1.pl .

       Without the '-S' parameter the script will likely fail with:

              /usr/bin/env: 'perl -w -T': No such file or directory

       See the full documentation for more details.

   --default-signal[=SIG] usage
       This option allows setting a signal handler to its default action,
       which is not possible using the traditional  shell  trap  command.
       The  following example ensures that seq will be terminated by SIG‐
       PIPE no matter how this signal is being  handled  in  the  process
       invoking the command.

              sh -c 'env --default-signal=PIPE seq inf | head -n1'

NOTES
       POSIX's exec(2) 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
       GNU  coreutils  online  help:  <https://www.gnu.org/software/core‐
       utils/>
       Report    any   translation   bugs   to   <https://translationpro‐
       ject.org/team/>

COPYRIGHT
       Copyright © 2020 Free Software Foundation, Inc.   License  GPLv3+:
       GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       sigaction(2), sigprocmask(2), signal(7)

       Full documentation <https://www.gnu.org/software/coreutils/env>
       or available locally via: info '(coreutils) env invocation'

GNU coreutils 8.32              April 2020                         ENV(1)