| Name : perl-Acme-CPANModules-ReadingFilesBackward
| |
| Version : 0.001
| Vendor : obs://build_opensuse_org/devel:languages:perl
|
| Release : 1.1
| Date : 2020-03-01 07:06:39
|
| Group : Development/Libraries/Perl
| Source RPM : perl-Acme-CPANModules-ReadingFilesBackward-0.001-1.1.src.rpm
|
| Size : 0.03 MB
| |
| Packager : (none)
| |
| Summary : Reading files backward (in reverse)
|
Description :
Reading files backward (in reverse).
Probably the fastest way, if you are on a Unix system, is to use the *tac*
command, which can read a file line by line in reverse order, or paragraph
by paragraph, or character by character, or word by word, or by a custom
separator string or regular expression. Example for using it from Perl:
open my $fh, \"tac /etc/passwd |\";
print while < $fh>
Another convenient way is to use the Perl I/O layer PerlIO::reverse. It
only does line-by-line reversing, but you can use the regular Perl API. You
don\'t even have to \'use\' the module explicitly (but of course you have to
get it installed first):
open my $fh, \"< :reverse\", \"/etc/passwd\";
print while < $fh>
If your file is small (fits in your system\'s memory), you can also slurp
the file contents first into an array (either line by line, or paragraph by
paragraph, or what have you) and then simply \'reverse\' the array:
open my $fh, \"< \", \"/etc/passwd\";
my AATTlines = < $fh>
print for reverse AATTlines;
If the above solutions do not fit your needs, there are also these modules
which can help: File::ReadBackward, File::Bidirectional. File::ReadBackward
is slightly faster than File::Bidirectional, but File::Bidirectional can
read forward as well as backward. I now simply prefer PerlIO::reverse
because I don\'t have to use a custom API for reading files.
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/perl:/CPAN-A/openSUSE_Tumbleweed/noarch |
