/tmp>echo 'pstree -Aal' >> shebang.pl

/tmp>./shebang.pl
./shebang.pl: line 5: use: command not found
./shebang.pl: line 6: use: command not found
./shebang.pl: line 8: print: command not found
init
  .
  .
  .
  |-sshd
  |   `-sshd
  |       `-sshd
  |           `-bash
  |               `-bash
  |                   `-pstree -Aal
  .
  .
  .