Dpuiu Perl
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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