1

I had 1000 directories with different names, but the files in all those directories has a files starting with tran-20.ft, tran-30.ft, tran-40.ft, tran-50.ft, tran-60.ft.

Directory structure

dir1 ---tran-20.ft
  :     tran-30.ft
  :     tran-40.ft
  :     tran-50.ft
  :     tran-60.ft
  :
dir1000

Expected output

dir1 --- dir1_tran-20.ft
         dir1_tran-30.ft
         dir1_tran-40.ft
         dir1_tran-50.ft
         dir1_tran-60.ft

I'd like to add directory name as a prefix to specific files(tran*) only? How I do that?

roaima
  • 107,089
  • 14
  • 139
  • 261
sunnykevin
  • 89
  • 1
  • 8

1 Answers1

4

Like this with parameter expansions:

for f in */tran-*.ft; do
    echo mv "$f" "${f%%/*}/${f%%/*}_${f##*/}"
done

Remove the echo when outputs looks good enough

Or like this with Perl's rename:

rename -n 's!^([^/]+)/(tran-\d+\.ft)!$1/${1}_$2!' */tran-*.ft

Remove the -n switch when outputs looks good enough

Gilles Quénot
  • 31,569
  • 7
  • 64
  • 82
  • I tried it's not working. But it shows in echo ? result file remains same, no prefix added to files. – sunnykevin Jun 14 '20 at 16:19
  • 2
    Did you read what I wrote ? **Remove the `echo` when outputs looks good enough** – Gilles Quénot Jun 14 '20 at 16:26
  • Sorry @ Gilles I confused my self, It working. Thanks! – sunnykevin Jun 14 '20 at 17:37
  • What exactly do you mean by *pure shell*? The second command looks *purer* shell style as it does one invocation of the appropriate command for the task while the first one runs many invocations of `mv` in a loop. – Stéphane Chazelas Jun 14 '20 at 19:35
  • 1
    Maybe 'simple' would be more appropriate than 'pure'. Anyway, removed this mention. I know `rename` is better, but many times I show this, the OP don't understand or don't want to install 'external tools' and prefer what he whows better, like my first snippet. That's why I show both methods – Gilles Quénot Jun 14 '20 at 19:36