More stuff derived from sh:

• # as comment character.
• Here-docs (perl's being much more powerful).
• Capturing command stdout with backticks, i.e. `$cmd`.
• "$var" interpolates $var, while '$var' does not.
• Built-in vars: $? status of last command; $$ pid; $0 program name.
• Having separate "string" versus "numeric" operators, albeit with different names; for example, shell uses = for string equality, -eq for numeric, while perl is more logical (string variants alphabetic), == for numeric, eq for string.
• && and || operators (ok, C has these too).
• the tr function seems inspired by Unix tr command, with y synonym to appease sed fanatics (modern day golfers being grateful for said sed fanatics early influence:-).
• Many other perl internal functions seem inspired from sh or Unix commands, for example: shift, chown, chmod, mkdir, eval, exit, kill, sleep, umask.