linux grep / awk / cut / egrep / echo / experience

1. Examples

http://www.test.com/atk/pki/test-1.1.tar.gz

Filtered test-1.1.tar.gz

t = http://www.test.com/atk/pki/test-1.1.tar.gz

(1)   egrep -o "[^/]+$"

(2)   echo ${line##*/}

(3)   awk -F/ '{print $NF}'  t

 

2. Take IP

ifconfig eth0 | grep "inet addr" | awk '{print $2}' | cut -d: -f2

ifconfig eth0 | egrep -o 'addr:[0-9\.]+' |cut -d: -f2

ifconfig eth0 | egrep -o 'addr:[0-9\.]{7,}' | head -n1

ifconfig eth0 | awk -F'[: ]+'  'inet addr/{print $4}'

ifconfig eth0 | awk -F'[[:space:]:]+'  '/inet addr/{print $4}'

 

3. Extract pages htmlMP4 file

egrep -o '[^><]+mp4<'   *.html

egrep -o '[^*><]+mp4'   *.html

awk -F '<a[^>]+>|</a>' '{for(i=1;i<=NF;i++){if(match($i,"mp4"))print $i}}'

awk 'BEGIN(RS=">|<") /mp4$/{print($0)}'