Quick rename in shell

If you do not have rename command in shell, here is some quick alternative cmds.

Given there are some files in current dir:

$ ls
0520.csv  0523.csv  526.csv  522.csv

And 526.csv and 522.csv is ill-formatted by missing leading zero. Now use cmd and see:

$ for f in ???.csv; do echo $f; done
522.csv
526.csv

Then add mv after echo cmd:

$ for f in ???.csv; do echo $f; mv $f "0$f"; done
$ ls
0522.csv  0523.csv  0525.csv  0526.csv

The mv part could be more sophisticated:

$ for f in ???.csv; do echo $f; mv $f "${f%.csv}0.csv"; done
$ ls
0523.csv  0525.csv  5220.csv  5260.csv

// add trailing zero to file name with mv $f “${f%.csv}0.csv”

$ for f in ???.csv; do echo $f; mv $f "$(echo $f | sed 's/csv/txt/')"; done
$ ls
0523.csv  0525.csv  5220.csv  5260.csv

// replace any part of file name with sed cmd and regex mv $f “$(echo $f | sed ‘s/csv/txt/’)”

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Written on May 18, 2019