[GREP 101] Grep 101 #grep #101 #find #word #line #after #before #recursive #between #tags #script

GREP101.md

GREP 101

• Grep code recursively between <script></script> tags grep -oRP '<script[^>]*>(.*?)</script>'

• Grep minimum six numbers grep -E '[0-9]{6}' file.txt

• Grep files that does not containt string grep -L "foo" *

• Find file and grep two values in one grep find . -name 'myfile' -exec grep 'VAL1\|VAL2' {} ';'

• Grep two patterns grep -E 'pattern1.*pattern2' -r

• Grep a tail output tail -F file.txt|grep --line-buffered 'stringtogrep'

• Print only filename grep -l -R '\[a\]'

• Grep word after match grep -oP 'APP_SOCKET_URL=\K.*' .env

• Grep line after match grep -A2 "mymatch" myfile.txt

• Grep 10 lines after match grep -iR -A 10 'cors:'

• Grep 5 lines before match grep -iR -B 10 'cors:'

Can you provide any guidance on how to convert a JavaScript RegExp to one that grep will match?

Hi,

i found this example => https://stackoverflow.com/questions/7432379/convert-javascript-regexp-to-work-with-grep-or-sed

The main idea is to use egrep (grep -E) for extended Regexp

I hope it fits you needs !

I read that question and answer before asking here. I adjusted the code at https://stackoverflow.com/questions/50666954/switch-puls-audio-record-stream-for-gstreamer-pipeline

SOURCE_OUTPUT_INDEX=`pactl list source-outputs | grep -E "(Source\sOutput|media\.name)" | grep Record\Stream -B1 | grep -o -E -m1 "[0-9]+"`
SOURCE_INDEX=`pactl list sources | grep -E "(Source\s|device\.class)" | grep monitor -B1 | grep -o -E -m1 "[0-9]+"`
pactl move-source-output $SOURCE_OUTPUT_INDEX $SOURCE_INDEX

Now I will try to adjust the code to toggle between "monitor" device.class and device.class "sound" when the script is called. Thanks.