2

I would like to prepend numerical order form 1-777 on the orders given to it. You can loop it through and increment variable in Bash. However, I would like to do it with Zsh and/or Awk. An example follows. Filenames

IMG_20161215_081850.jpg
IMG_20161215_081851.jpg
IMG_20161215_090559.jpg
IMG_20161215_090601.jpg
IMG_20161215_091308.jpg

Wanted

1.IMG_20161215_081850.jpg
2.IMG_20161215_081851.jpg
3.IMG_20161215_090559.jpg
4.IMG_20161215_090601.jpg
5.IMG_20161215_091308.jpg

OS: Debian 8.5

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    Is this a "visual" thing only (having the current number displayed when listing the files) or do you want to rename the files ? – don_crissti Dec 23 '16 at 19:21
  • @don_crissti I want to rename the files. – Léo Léopold Hertz 준영 Dec 23 '16 at 21:00
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    There's plenty of similar questions if you search rename e.g. 1, 2 so in your case autoload zmv then i=0; zmv -n '*' '$((++i)).$f' and remove the -n if you like what you see... – don_crissti Dec 23 '16 at 21:18
3
ls *.jpg | nl -s.

nl will add line numbers; -s. specifies a . as the separator between the number and the data (in this case, the file names). If you want to remove the leading spaces from the output, you can add this:

ls *.jpg | nl -s. | sed 's/^ *//'

sed will then remove zero or more spaces from the start of the line.

If you really want to do this with awk:

ls *.jpg | awk '{ print NR"."$0 }'

NR is an internal variable indicating the number of records thus far parsed.

To make permanent changes in filenames, do the following (Michael Vehrs)

ls *.jpg | nl -s. | sed 's/ *\([0-9]\+\)\.\(.*\)/\2 \1\.\2/' | xargs -n 2 mv
  • How can you make the changes permanent in filenames? - - I think your nl approach is outstanding. I actually did not know about the command. – Léo Léopold Hertz 준영 Dec 25 '16 at 9:43
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    You need to pipe the result to mv, like this ls *.jpg | nl -s. | sed 's/ *\([0-9]\+\)\.\(.*\)/\2 \1\.\2/' | xargs -n 2 mv. – Michael Vehrs Dec 27 '16 at 9:55
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With zsh, use zmv to perform bulk renaming. First run autoload -U zmv (put this in your .zshrc), then

i=1
zmv 'IMG_*.jpg' '$((i++)).$f'

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