How can I remove all text after a character in bash? Linux Commands – Remove All Text After X | sed remove character before match

tags: how to remove text before or after a specific character in word, bash remove character from string, sed remove character, sed remove character after match, sed remove character before match

sed remove character before match

Many occasions when we might want to remove the text after the match character or special character in the big line  so this post is very helpful for you if you.

Just for the example, I have one file like linuxtopic.com and i need only one value number so i will remove  everything after the match, below steps are:

Used Command

   1 - cat

   2 - grep

   3 - awk

   4 - sed

This is output of command, written  in in text file for this tutorial. In below output I need a only run_value without double quote and squarer bracket.

When we grep "run_value" from the file, we got below output

grep run_value /tmp/linuxtopi.com

for the more relevant output, we will use awk command in above command with the help of pipe "|".

 grep run_value /tmp/linuxtopi.com | awk '{print $3}'

In the above screenshot, We print 3rd Colom with the help of awk command

Now we have only one word like run_value="[1000930]" but we need only a value so we will use sed command for remove all text or character before / after the match.

grep run_value /tmp/linuxtopi.com | awk '{print $3}' | sed 's/.*\[//g'

In the above command we remove everything after the match square bracket.

Explanation of command

sed 's/.*\[//g'

sed  =  is command

's     =  for search,

 .*    =  everything after the match

 \[     =  character/word which we have to remove everything after the match

//      =  indicate remove/nothing 

g'     = global 

We removed all text or characters before the match via above command now we will remove all the text or characters after the match

grep run_value /tmp/linuxtopi.com | awk '{print $3}' | sed 's/.*\[//g' | sed 's/\].*//g'

Yes!, I got it!, above case in perform with my custom command 

Thanks you !! 

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