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Shell Programming and Scripting
Cut text from a file and remove
Post 302858223 by CarloM on Sunday 29th of September 2013 03:32:33 PM
09-29-2013
-n - don't automatically print lines
x; - swap the current pattern space (in this case, the whole line just read) with the 'hold' buffer. When the first line is processed this swaps the 'A' line into 'hold' and has nothing in the pattern space, for the second line it swaps the 'B' line into 'hold and the 'A' line back into the pattern space, and so on.
$s/ |.*// - on processing the last line, replace (in the pattern space) ' |' followed by any number of any character with nothing. (Note that the replace is actually happening on the last-but-one line, since it was just swapped out of hold.)
1!p; - on processing any line except the first, print the pattern space (which is now the previous line).
${x;p} - on processing the last line, swap the hold & pattern space again (which gets the actual last line back) and print the pattern space.
Hopefully that makes sense. It's late
.
x; - swap the current pattern space (in this case, the whole line just read) with the 'hold' buffer. When the first line is processed this swaps the 'A' line into 'hold' and has nothing in the pattern space, for the second line it swaps the 'B' line into 'hold and the 'A' line back into the pattern space, and so on.
$s/ |.*// - on processing the last line, replace (in the pattern space) ' |' followed by any number of any character with nothing. (Note that the replace is actually happening on the last-but-one line, since it was just swapped out of hold.)
1!p; - on processing any line except the first, print the pattern space (which is now the previous line).
${x;p} - on processing the last line, swap the hold & pattern space again (which gets the actual last line back) and print the pattern space.
Hopefully that makes sense. It's late
.This User Gave Thanks to CarloM For This Post:
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LEARN ABOUT DEBIAN
update-metainit
UPDATE-METAINIT(1) User Contributed Perl Documentation UPDATE-METAINIT(1) NAME
update-metainit - Generates init scripts SYNOPSIS
update-metainit [--remove initname [--purge] ] DESCRIPTION
Metainit solves the problem of writing good init scripts. Instead of manually creating these important files, they are derived from a declaritive description in the metainit files in /etc/metainit. These files can be shipped with packages or created by the local adminis- trator. If update-metainit called without argument, it will regenerate init scripts for all the files in /etc/metainit. The generated files contain a large warning in form of a comment that they will be overridden. Modifications are preferably done in the files in /etc/metainit and made effective by running update-metainit. If needed, the administrator can prevent modified init files by removing the warning comment. OPTIONS
--remove initname This command will remove any generated and non-modified scripts that were created by the metainit file with the name initname. --purge Only usable with --remove. Will remove the generated files even if modified. SEE ALSO
dh_metainit(1) AUTHOR
Joachim Breitner <nomeata@debian.org> perl v5.8.8 2007-07-30 UPDATE-METAINIT(1)