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Dobrica Pavlinušić's random unstructured stuff

Shell

Welcome to scratch pad of usefull shell snippets

Contents

remove all php4 packages with apt-get
use socat as simple serial program
list first ten files from srchives
tail recent logs and put output in file
port forwarder using socat
remove all filesystem cache

remove all php4 packages with apt-get

dpkg -l | grep php4 | awk '{ print $2 }' | xargs apt-get remove -y

use socat as simple serial program

socat - /dev/ttyS0,b9600,echo=0,raw

list first ten files from srchives

ls *.tar.gz *.tgz | xargs -i sh -c "ls -hs '{}' ; echo ; tar tvfz '{}' | head -10 ; echo"

ls *.tar.bz2 *.tbz | xargs -i sh -c "ls -hs '{}' ; echo ; tar tvfj '{}' | head -10 ; echo"

Yes, it sucks that tar doesn't know how to handle compression formats automatically...

tail recent logs and put output in file

Useful to take a quick view into last lines, reload page (and capture newly created errors/infos) and store that in single file for easy review (in vim :-)

tail -f /var/log/apache2/*.log | tee ~/log

port forwarder using socat

socat -d -d TCP4-LISTEN:1280,fork TCP4:192.168.212.5:80

remove all filesystem cache

echo 3 > /proc/sys/vm/drop_caches

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Welcome to scratch pad of usefull shell snippets

{toc: }

^ remove all php4 packages with apt-get

.pre
dpkg -l | grep php4 | awk '{ print $2 }' | xargs apt-get remove -y
.pre

^ use socat as simple serial program

.pre
socat - /dev/ttyS0,b9600,echo=0,raw
.pre

^ list first ten files from srchives

.pre
ls *.tar.gz *.tgz | xargs -i sh -c "ls -hs '{}' ; echo ; tar tvfz '{}' | head -10 ; echo"

ls *.tar.bz2 *.tbz | xargs -i sh -c "ls -hs '{}' ; echo ; tar tvfj '{}' | head -10 ; echo"
.pre

> Yes, it sucks that `tar` doesn't know how to handle compression formats automatically...

^ tail recent logs and put output in file

Useful to take a quick view into last lines, reload page (and capture newly created errors/infos) and store that in single file for easy review (in vim :-)

.pre
tail -f /var/log/apache2/*.log | tee ~/log
.pre

^ port forwarder using socat

.pre
socat -d -d TCP4-LISTEN:1280,fork TCP4:192.168.212.5:80
.pre

^ remove all filesystem cache

.pre
echo 3 > /proc/sys/vm/drop_caches
.pre