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  1. or download this
    $ perl -e '"abc" =~ s/c$//'
Can't modify constant item in substitution (s///) at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
  2. or download this
    $ perl -e '2++'
Can't modify constant item in postincrement (++) at -e line 1, near "2
+++"
Execution of -e aborted due to compilation errors.