Script bash : Remove numbers from a file name between "-" and "_"

Question

I need to remove a serial number in my file name which is between - and _ (the underscore should also be removed).

Original file name : 20190815-12345_table_file.rar

Expected : 20190815-table_file.rar

My bash code :

for f in ./*.rar;
do fn=`echo $f|sed 's/^-[0-9].*_$/-/g'`;
mv "$f" "$fn";
done;

I tried something like this because i know that my numbers are starting with "-" (so ^) are numbers ([0-9].*) and are ending with "_" (so $) and I want to replace numbers by "-".

But with this method it doesn’t work.

D. Ben Knoble · Accepted Answer · 2019-05-16 22:27:33Z

2

You’re regex for sed doesn’t match the way you want: the start and end delimiters are anchors to the start and end of a line. Also, you want [0-9]* without the dots for any amount of digits.

Try this instead:

for f in ./*.rar; do
  fn="$( sed 's/-[0-9]*_/-/g' <<<"$f" )"
  mv "$f" "$fn"
done

In bash, you can use a parameter expansion to do the substitute without sed; I’ve forgotten the exact syntax, so I’ll leave it out for now and add it later. Check man bash for the details.

answered May 16, 2019 at 22:27

D. Ben Knoble

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Comments

Tim · Accepted Answer · 2019-05-17 00:35:28Z

1

An all Bash solution is:

for f in ./*.rar; do
  mv "$f" "${f/-*([0-9])_/-}"
done

You must have the extglob shell option enabled with shopt -s extglob for the *() pattern to work.

See the Bash Reference Manual or this answer for more information on how the parameter expansion works.

edited May 17, 2019 at 0:35

answered May 17, 2019 at 0:28

Tim

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