As mr_mischief has already pointed out, Perl scripts are first compiled to an internal form, ensuring syntax errors are caught at compile time rather than run time ... and considerably speeding up script execution at run time.
To give a specific example of where shell can be slow, consider the common task of running an external command recursively on all files under a given directory. In shell, you could use the find command with its -exec option, but that results in a new process being created for every file. I've measured cases traversing thousands of files where such an approach proved to be hundreds of times slower than using Perl's File::Find module in harness with a Perl function performing the work of the external command. The performance difference is especially noticeable when the external command doesn't do much work. Of course, the way to solve this performance problem in shell is to use find in harness with xargs, but there are portability pitfalls for the unwary, namely when the filenames might contain spaces or other unusual characters -- as indicated in this response to a gnat use.perl.org journal entry.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||