ENV(1) ENV(1) env - env []... [-] [=]... [ []...] -i, --ignore-environment -0, --null NUL -u, --unset= -C, --chdir= -S, --split-string=S S shebang --block-signal[=] --default-signal[=] --ignore-signal[=] --list-signal-handling -v, --debug --help --version "-" -i 'PIPE' '1' -S/--split-string -S 1.pl #!/usr/bin/env -S perl -w -T ... perl -w -T 1.pl . '-S' /usr/bin/env: 'perl -w -T': --default-signal[=] shell trap seq SIGPIPE sh -c 'env --default-signal=PIPE seq inf | head -n1' POSIX exec(2p) " exec exec " Richard MlynarikDavid MacKenzie Assaf Gordon GNU coreutils Copyright (C) 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later . sigaction(2), sigprocmask(2), signal(7) info '(coreutils) env invocation' man man https://github.com/man-pages-zh/manpages- zh GNU coreutils 9.1 20229 ENV(1)