Making sure command-line arguments are interpreted clearly

This page contains a variety of advice related to ensuring that command-line arguments are interpreted the intended way. These situations vary quite a bit, but to give you a good idea of what this page is about, they're often similar to how the double-dash is used to allow some unusual filenames to be safely listed after it.

Commands that accept "--"

• grep
• rm

Commands remotely executed via SSH

An example:

                    # vvv   This Perl command just removes spaces+newlines from the here-document.
REMOTE_COMMAND=$(perl -0777 -pe 's/ ^\s+ | \s+$ | [\n\r]+ / /xs' <<'END'

    bash --login --init-file <( echo "PS1=notempty;   . \"$HOME/.bashrc\";   run_during_login.sh " )

END
)

ssh -t server.com "$REMOTE_COMMAND"