# phpman > man > ops(3pm)

## NAME
    ops - Perl pragma to restrict unsafe operations when compiling

## SYNOPSIS
      perl -Mops=:default ...    # only allow reasonably safe operations

      perl -M-ops=system ...     # disable the 'system' opcode

## DESCRIPTION
    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.

## SEE ALSO
    Opcode, Safe, perlrun