Extract one word after a specific word on the same line
How can I extract a word that comes after a specific word in Linux (csh)? More precisely, I have a file which has a single line which looks like this:
[some useless data] --pe_cnt 100 --rd_cnt 1000 [some more data]I want to extract the number 100 which is after the --pe_cnt word.
I cannot use sed as that works only if you want to extract an entire line. Maybe I can use awk?
Also, I have multiple files that have different values instead of 100 so I need something that extracts the value but doesn't depend on the value.
Answer
With awk:
awk '{for(i=1;i<=NF;i++) if ($i=="--pe_cnt") print $(i+1)}' inputFile
Basically loop over each word of the line. When you find the first you are looking for, grab the next word and print it.
With grep:
grep -oP "(?<=--pe_cnt )[^ ]+" inputFile