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Diffstat (limited to 'pod/perlop.pod')
| -rw-r--r-- | pod/perlop.pod | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/pod/perlop.pod b/pod/perlop.pod index 32a0827cb3..2709a9eaa2 100644 --- a/pod/perlop.pod +++ b/pod/perlop.pod @@ -808,6 +808,24 @@ with $/ or $INPUT_RECORD_SEPARATOR). $today = qx{ date }; +Note that how the string gets evaluated is entirely subject to the +command interpreter on your system. On most platforms, you will have +to protect shell metacharacters if you want them treated literally. +On some platforms (notably DOS-like ones), the shell may not be +capable of dealing with multiline commands, so putting newlines in +the string may not get you what you want. You may be able to evaluate +multiple commands in a single line by separating them with the command +separator character, if your shell supports that (e.g. C<;> on many Unix +shells; C<&> on the Windows NT C<cmd> shell). + +Beware that some command shells may place restrictions on the length +of the command line. You must ensure your strings don't exceed this +limit after any necessary interpolations. See the platform-specific +release notes for more details about your particular environment. + +Also realize that using this operator frequently leads to unportable +programs. + See L<"I/O Operators"> for more discussion. =item qw/STRING/ |