CODEWITHSUNDEEP
unixsedgrep
saz
saz

Reputation: 291

Unix Loop through files, grab specific text in the files and create new files with those lines only

I have folder that contains about a 100 files. I want to search for a specific word in each file, pick up only those lines from each file and put them in separate files. For example:

Look for lines that contain the word "HELLO" (case-sensitive) in FILE1.txt, FILE2.txt, FILE3.txt.

From FILE1, copy those lines and put them in a new file, FILE1_BK.txt
From FILE2, copy those lines and put them in a new file, FILE2_BK.txt
From FILE3, copy those lines and put them in a new file, FILE3_BK.txt

I know how to do this one file at a time but am unable to write the script for multiple files at once.

grep "HELLO" FILE1.txt > FILE1_BK.txt

Need to incorporate it in the loop.

for f in myFolder; do something; done;

Thanks in advance!

Upvotes: 0

Views: 1895

Answers (3)

dnit13
dnit13

Reputation: 2496

Lets say you have filepaths stored in a file named filenames.txt Then you can do:

while read -r filepath; do
    grep -r "pattern" $filepath > "$filepath""-output"
done < filenames.txt

This obviously assumes all filepaths are in new lines in filenames.txt

Upvotes: 1

PressingOnAlways
PressingOnAlways

Reputation: 12356

Why loop through it manually? Why not grep "HELLO" *.txt > FILE1_BK.txt ?

for f in *.txt; do
    grep "HELLO" $f > $f_found.txt;
done

Upvotes: 1

saz
saz

Reputation: 291

for f in ./myFolder/*; do grep "SEARCHWORD" $f > $f.bak; done;

Upvotes: 0

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