Download E-books Learning Perl PDF

By brian d foy, Tom Phoenix

If you are simply getting began with Perl, this is often the ebook you want—whether you are a programmer, process administrator, or net hacker. Nicknamed "the Llama" via generations of clients, this bestseller heavily follows the preferred introductory Perl path taught by means of the authors considering the fact that 1991. This sixth variation covers fresh adjustments to the language as much as model 5.14.

Perl is acceptable for nearly any job on virtually any platform, from brief fixes to accomplish net purposes. Learning Perl teaches you the fundamentals and indicates you the way to jot down courses as much as 128 strains long—roughly the scale of ninety% of the Perl courses in use at the present time. every one bankruptcy comprises routines that can assist you perform what you've got simply discovered. different books may well train you to software in Perl, yet this e-book will flip you right into a Perl programmer.

Topics include:

  • Perl facts and variable types
  • Subroutines
  • File operations
  • Regular expressions
  • String manipulation (including Unicode)
  • Lists and sorting
  • Process management
  • Smart matching
  • Use of 3rd celebration modules

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If you want to grasp, do them one by one in a loop: foreach my $file (qw(slate bedrock lava)) { unlink $file or warn "failed on $file: $! \n"; } right here, every one dossier being deleted separately ability the go back price may be zero (failed) or 1 (succeeded), which occurs to seem like a pleasant Boolean price, controlling the execu- tion of warn. utilizing or warn is identical to or die, other than that it’s no longer deadly, after all (as we acknowledged again in bankruptcy 5). as a result, we placed the newline at the finish of the message to warn simply because it’s now not a malicious program in our application that explanations the message. whilst a specific unlink fails, the $! variable is determined to whatever concerning the working procedure errors, which we’ve integrated within the message. This is sensible to take advantage of in basic terms while doing one filename at a time as the subsequent working process failed request resets the variable. You can’t eliminate a listing with unlink (just such as you can’t get rid of a listing with the straightforward rm invocation either). search for the rmdir functionality arising almost immediately for that. Now, here’s a little-known Unix truth. It seems for you to have a dossier that you simply can’t learn, you can’t write, you can’t execute, probably you don’t even personal the file—that is, it’s an individual else’s dossier altogether—but you could delete it. That’s as the 196 | bankruptcy 13: Directory Operations permission to unlink a dossier doesn’t depend on the permission bits at the dossier itself; it’s the permission bits at the listing that comprises the dossier that issues. We point out this simply because it’s basic for a starting Perl programmer, within the direction of testing unlink, to make a dossier, to chmod it to zero (so that it’s no longer readable or writable), after which to determine no matter if this makes unlink fail. yet as an alternative it vanishes with out quite a bit as a whimper. * if you happen to really need to work out a failed unlink, even though, simply attempt to get rid of /etc/ passwd or the same procedure dossier. considering the fact that that’s a dossier managed by means of the method administrator, you won’t be ready to eliminate it. † Renaming documents Giving an current dossier a brand new identify is straightforward with the rename functionality: rename "old", "new"; this is often just like the Unix mv command, taking a dossier named outdated and giving it the identify new within the comparable listing. you can also circulate issues round: rename "over_there/some/place/some_file", "some_file"; This strikes a dossier referred to as some_file from one other listing into the present listing, supplied the consumer operating this system has the best permissions. ‡ Like such a lot features that request whatever of the working process, rename returns fake if it fails, and units $! with the working method blunders, so that you can (and frequently should still) use or die (or or warn) to file this to the person. One common‖ query within the Unix shell-usage newsgroups issues the right way to rename every little thing that ends with . previous to a similar identify with . new. Here’s tips to do it in Perl properly: foreach my $file (glob "*. old") { my $newfile = $file; $newfile =~ s/\. old$/. new/; if (-e $newfile) { warn "can't rename $file to $newfile: $newfile exists\n"; } elsif (rename $file, $newfile) { ## luck, do not anything } else { warn "rename $file to $newfile failed: $!

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