Dpuiu Perl: Difference between revisions
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* [http://en.wikipedia.org/wiki/Plain_Old_Documentation POD]; pod2html pod2latex pod2man pod2text pod2usage | * [http://en.wikipedia.org/wiki/Plain_Old_Documentation POD]; pod2html pod2latex pod2man pod2text pod2usage | ||
= | = In place editing = | ||
* Edit a file in place: -i | * Edit a file in place: -i | ||
perl -i.bck script.pl xxx | perl -i.bck script.pl xxx | ||
=> xxx(new), xxx.bck(old) | => xxx(new), xxx.bck(old) | ||
= BEGIN/END blocks = | |||
perl -ane 'BEGIN { print "sum\n"} END { print $sum,"\n" } $sum += $F[0]; ' | |||
= Regular Expressions = | = Regular Expressions = | ||
| Line 23: | Line 26: | ||
perl -MLWP::Simple -e' print head "http://www.example.com"' | perl -MLWP::Simple -e' print head "http://www.example.com"' | ||
perl -e 'use LWP::Simple; print head "http://www.example.com"' | perl -e 'use LWP::Simple; print head "http://www.example.com"' | ||
= Variables = | |||
* $. : input line number | |||
Revision as of 12:15, 4 November 2008
POD
- POD; pod2html pod2latex pod2man pod2text pod2usage
In place editing
- Edit a file in place: -i
perl -i.bck script.pl xxx => xxx(new), xxx.bck(old)
BEGIN/END blocks
perl -ane 'BEGIN { print "sum\n"} END { print $sum,"\n" } $sum += $F[0]; '
Regular Expressions
- Maximal match (default)
echo $PERLLIB | perl -ane '/^(.+):/; print $1,"\n"'
- Minimal match
echo $PERLLIB | perl -ane '/^(.+?):/; print $1,"\n"' /fs/sz-user-supported/Linux-x86_64/lib
Search directories
- -Idir : same as "use lib dir_name"
default: /usr/include & /usr/lib/perl add dirs to PERLLIB
Modules
- -M moldule: same as "use module_name"
perl -MLWP::Simple -e' print head "http://www.example.com"' perl -e 'use LWP::Simple; print head "http://www.example.com"'
Variables
- $. : input line number