1

In a directory, I have about 150 files with a certain extension, for example:

abc.ext
def.ext
ghi.ext
...

Now I want to copy all of these files also to a new filename (without extension):

abc
def
ghi

What is the shortest way to get this done? Is it possible without writing a loop in a bash file?

Edit: Thank you for your answers (dirkt, John Newman).
After seeing the answers I'll stick with the shorter one, although it has a loop.

  • With zsh: autoload zmv; zmv -C -n '(*).ext' '$1' (remove the -n if you like what you see...) – don_crissti Dec 19 '16 at 20:43
2

It's possible without writing a script ("bash file"), but not without using a loop:

for f in *.ext ; do cp -- "$f" "$(basename "$f" .ext)" ; done

basename can be used to remove the suffix.

  • Be sure to quote your variables, lest one of those names have, say, a space in them – Eric Renouf Dec 19 '16 at 18:39
1

It's definitely possible without a loop. Is it good ... I'll leave that up to you.

$ find . -type f -name "*.ext" -print0 | xargs -0 -I {} echo cp -T {} {}SUB | sed -e 's/\.extSUB//g'

append a pipe to sh to get out of dry run mode. Backticks are no good as it strips the newlines, unless you deal with $IFS. And there are other character issues with backticks as mentioned. Also need the cp -T as the last argument is normally expecting a directory.

I don't have enough "rep" to comment on the above, but you can use various tricks with bash ${} to avoid the fork of basename.

Substring: ${f:0:-4} or longest match: ${f%%.ext}

  • Without the echo, what would be getting piped to sed? Also, without the echo wouldn't the cp happen before you strip the extra text from the end? – Eric Renouf Dec 19 '16 at 18:07
  • you're correct .. i obviously never bothered to try that. i edited it. – John Newman Dec 19 '16 at 18:25
  • Although using backticks (or $()) will rebreak things if there are unsafe characters in the filenames, which you were protecting against with -print0 – Eric Renouf Dec 19 '16 at 18:38
  • edited again AND actually fully tested it this time. harder than I thought. backticks strip the new lines. – John Newman Dec 19 '16 at 18:47
  • Sadly, this still fails for my file with a space.ext and also $'new\nline.ext' – Eric Renouf Dec 19 '16 at 18:54

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