bash - Renaming files with multiple variables in the file names -

i have multiple files format: this-is-text_r_123.txt , this-is-text.txt.

what (preferable using for loop) rename this-is-text.txt files corresponding this-is-text_r_123.txt matches have i instead of r in file name. considering this-is-text random text (different 1 file another) , 123 in example above combination of 3 numbers. files in 1 directory.

i tried mv , rename wasn't successful

i've searched , reviewed file renaming questions here none matched case

i changed technology python demonstrate how in language more convenient bash:

#!/usr/bin/python3 import glob import re  text_files = glob.glob('*.txt')  #divide files 2 groups: "normal" files without _r , "target" files _r normal_files = {} target_files = {} path in text_files:     #extract "key" (meaning part of file name without _r or _i)     #as whether file contains _r or _i, or not     #using regular expressions:     result = re.match('(?p<key>.*?)(?p<target>_[ri]_?\d*)?\..*$', path)     if result:         if result.group('target'):             target_files[result.group('key')] = path         else:             normal_files[result.group('key')] = path  print(normal_files) print(target_files)  #now figure out how rename files using built dictionaries: key, path in normal_files.items():     if key in target_files:         target_path = target_files[key].replace('_r', '_i')         print('renaming %s %s' % (path, target_path)) 

for following set of files:

asd.txt asd_r_1.txt test test.txt test test_r2.txt test_i_1.txt 

this script produce:

{'test test': 'test test.txt', 'asd': 'asd.txt'} {'test test': 'test test_r2.txt', 'another test': 'another test_i_1.txt', 'asd': 'asd_r_1.txt'} renaming test test.txt test test_i2.txt renaming asd.txt asd_i_1.txt 

you should able move files this.

as see, it works.

if really need doing in bash, should easy port using sed or awk.