number files in directory according to their modification time

IFS=$'\n'; i=1; ls -lt *mp3 | cut -d ":" -f2 | cut -d " " -f2- | while read f; do mv "$f" $(echo "$i"."$f"); ((i++)); done
i use this after ripping internet radio streams to number the files as they originally played (even though streamripper can do this with -q). to number other types of files, or all files, just change the *mp3. to rename directories only you could use ... ls -lt | grep ^d | cut -d ":" -f2 | cut -d " " -f2- | while read ...
Sample Output
$> touch a.mp3 b.mp3 c.mp3 d.mp3
$> ls
a.mp3  b.mp3  c.mp3  d.mp3

$> IFS=$'\n'; i=1; ls -lt *mp3 | cut -d ":" -f2 | cut -d " " -f2- | while read f; do mv "$f" $(echo "$i"."$f"); ((i++)); done

$> ls
1.a.mp3  2.b.mp3  3.c.mp3  4.d.mp3

By: m1cawber
2011-01-22 00:21:12

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    RobertDeRose · 2014-08-29 17:52:34 0
  • find and normal files and list them sorting with modification time without group l: with detailed information t: sort with modification time r: reverse order h: show file's size in human-readable format, such as K(kilobytes), M(megabyes) etc. g: do not show group Show Sample Output

    find . -type f | xargs ls -ltrhg
    emacs · 2010-05-28 01:23:53 1
  • remove files with access time older than a given date. If you want to remove files with a given modification time replace %A@ with %T@. Use %C@ for the modification time. The time is expressed in epoc but is easy to use any other format. Show Sample Output

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  • List all files from the current directory and subdirectories, sorted by modification time, oldest first.

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    goodevilgenius · 2010-05-27 14:52:28 2

What Others Think

Parsing ''ls'' output is a bad idea (, therefore by using globs instead you can avoid using the IFS variable and the ''cut'' command. Try using globs ;)
RanyAlbeg · 382 weeks and 6 days ago
For most people's usage, you can simplify your command. Get rid of the -l and replace it with -1 (dash one) to put each filename on a separate line. i=1; ls -1t *mp3 | while read f; do mv "$f" $(echo "$i"."$f"); ((i++)); done
flatcap · 382 weeks and 5 days ago
RanyAlbeg thanks for the link, good information there. and flatcap thx for cutting cut =p. ls -1 is new to me.
m1cawber · 382 weeks and 5 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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