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ls -al "file 1" "file'2" ; cat /etc/passwd

ls '-al' 'file 1' 'file'\''2' ';' 'cat' '/etc/passwd'

#!/usr/bin/perl
# used http://www.cs.hmc.edu/courses/2003/spring/cs60/fsm.pdf
...
  $arg .= $c;
}
print "$res\n";