Perl Tipps und Tricks: Difference between revisions
From Lolly's Wiki
Jump to navigationJump to search
m (Text replacement - "<source " to "<syntaxhighlight ") |
m (Text replacement - "</source" to "</syntaxhighlight") |
||
| Line 5: | Line 5: | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
perl -ne 'if (/(<a href=[^>]+action=login[^>]+>(?:(?!<\/a>).)*<\/a>)/){ print $1."\n"; }' index.html | perl -ne 'if (/(<a href=[^>]+action=login[^>]+>(?:(?!<\/a>).)*<\/a>)/){ print $1."\n"; }' index.html | ||
</ | </syntaxhighlight> | ||
This one matches a complete <pre><a href=...action=login...>(not </a>)</a></pre>. | This one matches a complete <pre><a href=...action=login...>(not </a>)</a></pre>. | ||
| Line 11: | Line 11: | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
perl -ne 'if (/(<a href=[^h]*(http[s]{0,1}:\/\/([^\/"]+)[^> "]+)[^> ]*>(?:(?!<\/a>).)*<\/a>)/){ print $3."|".$2."|".$1."\n"; }' index.html | perl -ne 'if (/(<a href=[^h]*(http[s]{0,1}:\/\/([^\/"]+)[^> "]+)[^> ]*>(?:(?!<\/a>).)*<\/a>)/){ print $3."|".$2."|".$1."\n"; }' index.html | ||
</ | </syntaxhighlight> | ||
Prints out: | Prints out: | ||
| Line 28: | Line 28: | ||
push(@linestack, $whatever); # unread | push(@linestack, $whatever); # unread | ||
} | } | ||
</ | </syntaxhighlight> | ||
| Line 35: | Line 35: | ||
<syntaxhighlight lang=perl> | <syntaxhighlight lang=perl> | ||
PERL_MM_OPT='optimize=-O2 cc=gcc ld=gcc cccdlflags=-DPIC' | PERL_MM_OPT='optimize=-O2 cc=gcc ld=gcc cccdlflags=-DPIC' | ||
</ | </syntaxhighlight> | ||
I used it to run sa-compile on Solaris: | I used it to run sa-compile on Solaris: | ||
| Line 60: | Line 60: | ||
/usr/bin/kill -HUP `cat /tmp/spamd-exim-acl.pid` | /usr/bin/kill -HUP `cat /tmp/spamd-exim-acl.pid` | ||
/usr/bin/kill -HUP `cat /tmp/spamd-ip.pid` | /usr/bin/kill -HUP `cat /tmp/spamd-ip.pid` | ||
</ | </syntaxhighlight> | ||
Revision as of 03:18, 26 November 2021
Negative match in RegEx (?:(?!PATTERN).)*
Usage of perl as a spcial grep :-):
perl -ne 'if (/(<a href=[^>]+action=login[^>]+>(?:(?!<\/a>).)*<\/a>)/){ print $1."\n"; }' index.html
This one matches a complete
<a href=...action=login...>(not </a>)</a>
.
Or more complex:
perl -ne 'if (/(<a href=[^h]*(http[s]{0,1}:\/\/([^\/"]+)[^> "]+)[^> ]*>(?:(?!<\/a>).)*<\/a>)/){ print $3."|".$2."|".$1."\n"; }' index.html
Prints out:
<server>|<url>|<complete href>
Unread while reading from filehandle
Dov Grobgeld made my day!
# Found at a comment of Dov Grobgeld at https://groups.google.com/d/msg/comp.lang.perl/7fPyGpWpP8M/hc7xTMvAoW0J
while($_ = shift(@linestack) || <IN>) {
:
push(@linestack, $whatever); # unread
}
Config
Override compile time flags on the commandline like this:
PERL_MM_OPT='optimize=-O2 cc=gcc ld=gcc cccdlflags=-DPIC'
I used it to run sa-compile on Solaris:
#!/bin/bash
exec >> /var/log/update-spamd-rules.log 2>&1
#LD_LIBRARY_PATH=/usr/sfw/lib
PATH=$PATH:/usr/local/bin:/opt/re2c/bin:/usr/sfw/bin:/usr/ccs/bin:/opt/csw/bin
PERL_VER=$(/usr/perl5/bin/perl -e 'printf "%.3f",$];')
SA_VER=$(/opt/spamassassin/bin/spamassassin -V | /usr/bin/nawk '
/SpamAssassin version/ {
split($NF,version,/\./);
printf "%d.%03d%03d",version[1],version[2],version[3];
}')
export LD_LIBRARY_PATH PATH PERL_VER SA_VER
/usr/perl5/bin/perlgcc -T /opt/spamassassin/bin/sa-update --updatedir=/var/opt/spamassassin/$SA_VER -D
PERL_MM_OPT='optimize=-O2 cc=gcc ld=gcc cccdlflags=-DPIC' /opt/spamassassin/bin/sa-compile --updatedir=/var/opt/spamassassin/compiled/${PERL_VER}/${SA_VER} -D
/usr/bin/kill -HUP `cat /tmp/spamd-exim-acl.pid`
/usr/bin/kill -HUP `cat /tmp/spamd-ip.pid`
