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 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.

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 SIGPIPE 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/coreutils/>
       Report any translation bugs to <https://translationproject.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'