CODEWITHSUNDEEP
bash
steT
steT

Reputation: 109

how to rename a file using part of a name stored in a variable

Hello everybody i'd like to know how to rename a file using part of a name stored in a variable. To be more clear i'll show you an example. Let's say i have to loop through all the files called test_*.txt so test_1.txt, test_2.txt ... test_45.txt and so on. At a point in the loop i need to rename a file test-name.txt in test-name1.txt, test-name2.txt according to the number in the test_1.txt file 

 for test in test_*.txt
 do 
     'rename test-name.txt to test-name(number in test).txt'
 done

Upvotes: 0

Views: 75

Answers (2)

Bharathwaj Sankara
Bharathwaj Sankara

Reputation: 31

You can also use pattern matching in bash:

[[ $file =~ test_(.*).txt ]];
mv test_name.txt test_name${BASH_REMATCH[1]}.txt

Upvotes: 0

Andrzej Pronobis
Andrzej Pronobis

Reputation: 36076

This should work:

for tst in test_*.txt
do
    nr=${tst#test_}  # Delete 'test_' from beginning of file name in tst
    nr=${nr%.txt}    # Delete '.txt' from end of file name in tst
    mv test_name.txt test_name_${nr}.txt
done

Upvotes: 2

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