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For example I have a file with words

jogging:1 swimming:1 running:1 breathing:1 riding:1 walking:1 jogging:2 seeing:1 seeking:1 looking:1 staring:1 practicing:1

And I want to search the whole file for that word if possible with a loop(for or while) and that word can appear multiple times So it would return this if I needed to search for the word jogging

jogging:1 jogging:2
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Like this:

$ grep -oP 'jogging:\d+' file jogging:1 jogging:2

or with an old grep:

$ grep -o 'jogging:[0-9]\+' file jogging:1 jogging:2

If you insist to use a for loop:

set -f for word in $(< file); do [[ $word =~ jogging:[0-9]+ ]] && echo "$word" done

I take advantage of word splitting here

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1 Comment

Word splitting yes, but also filename expansion. You might consider set -f

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