Perl 5 version 8.9 documentation
ops - Perl pragma to restrict unsafe operations when compiling
- perl -Mops=:default ... # only allow reasonably safe operations
- perl -M-ops=system ... # disable the 'system' opcode
pragma currently has an irreversible global effect, it is
only of significant practical use with the
option on the command line.
See the Opcode module for information about opcodes, optags, opmasks and important information about safety.