ops - Perl pragma to restrict unsafe operations when compiling

Since the "ops" pragma currently has an irreversible global effect, it is only of significant practical use with the "-M" option on the command line. See the Opcode module for information about opcodes, optags, opmasks and important information about safety.

ops - Perl pragma to restrict unsafe operations when compiling

Opcode, Safe, perlrun perl v5.40.1 2025-07-27 ops(3perl)

perl -Mops=:default ... # only allow reasonably safe operations perl -M-ops=system ... # disable the 'system' opcode