good evening,

i have a question ... in that title is a command with env and bash ...

what does "-S" mean?

in man stays, that S is for separate ...

in my book it is not explained good ... does -S activate, that "-x" is a flag for env or "-x" is a flag for bash or "-x" is not a part of the name, that "bash -x" is not name of shell and "bash" without "-x" is name of shell?

what case above does -S mean?

it is not well explained in my book. can you answer to my questions please?

Last edited by lo7777799 (2026-06-07 19:29:33)

Why ask, test and learn:

$ cat test.sh
#!/bin/env bash -x
echo one
echo two

$ ./test.sh
env: ‘bash -x’: No such file or directory
env: use -[v]S to pass options in shebang lines

$ vim test.sh    # edit to add -S flag

$ cat test.sh
#!/bin/env -S bash -x
echo one
echo two

$ ./test.sh
+ echo one
one
+ echo two
two

So just as the man page says:

Without the -S flag to 'env' the command it tries to execute is 'bash -x' which is not the name of an executable in the PATH.  With the -S, it does just as the man page says and splits that into multiple arguments of 'bash' and '-x'.

"UNIX is simple and coherent" - Dennis Ritchie; "GNU's Not Unix" - Richard Stallman