rickchengx commented on PR #13930:
URL:
https://github.com/apache/dolphinscheduler/pull/13930#issuecomment-1512460097
> > The actual command is `perl -Mbignum=bpi -wle "print bpi(2000)"`, if we
don't remove quotes, the command will be `perl -Mbignum=bpi -wle '"print
bpi(2000)"'` and cause error: `Useless use of a constant ("print bpi(2000)") in
void context at -e line 1.`
>
> Technically, the executed command is `"perl" "-Mbignum=bpi" "-wle" "print
bpi(2000)"`, args and command can all be seen as a string, like `ls -l`, it's
same with `"ls" "-l"`. So what we have to do is to remove quotes which is used
to wrap a single String.
>
> For the case echo `ls`, command to be executed is echo '`ls`', and will
print `ls`, however, if the command is echo "`date`", we can get the right
output. It may be an inner bug of kubernetes or i don't get the right usage...,
anyway, user can use `/bin/bash -c to handle this scenario.
If the command executed in the pod is `perl -Mbignum=bpi -wle print
bpi(2000)`, that would be a problem.
For example, the user command is `echo '$SHELL'`, which the expected output
is `$SHELL`
But if the quotes are removed and the command becomes `echo $SHELL`, the
output would be sth like `/bin/bash`, which is not the expected result
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