Copy a part of folder name and add into file name. Command forming help

[seloqxt]

I need to do a mass rename on files.

Example of current file structure:

folder1 [uid1]
  somename.ext
  somename2.ext

folder2 [uid2]
  somename.ext
  somename2.ext
  
folder3 [uid3]
  somename.ext
  somename2.ext

Now, I need to rename the files, such that the file names contain the parent folders uid, for example:

somename [uid].ext

So to do this, I think the command should first copy the parent directory's [] part and paste it in the end of the file names.

I think find command with -execdir might be able to perform this, But I am not sure or is there a better way to achieve the results? I am very much beginner to linux world and commands. Thanks for any help, much appreciated.

[hazel]

Try using the dirname command. It takes a pathname as argument and returns the directory part of the name. If you pass this through grep, you might be able to isolate the part of the name you want.

[nmset]

Perhaps this could help :

#!/bin/bash
DIR="/var/tmp"
for d in ${DIR}/folder*
do
  SUFFIX=${d##* }
  cd "${d}"
  for f in ./*.ext
  do
    NOEXT=${f%.*}
    mv "${f}" "${NOEXT} ${SUFFIX}.ext"
  done
done

[seloqxt]

Thanks for the clear understandable script. I successfully renamed the files after some trial tests on dummy file structure.

Just one more thing, interested to know, how does the

SUFFIX=${d##* }

gets the square brackets part of parent folder?

[nmset]

Bash Reference Manual

Look for the sections ${parameter#word} ${parameter##word}

word is expanded as with file names (* ? [ ]).

${parameter#*<char>} will keep everything after the first occurence of <char> and discard the rest.
${parameter##*<char>} will keep everything after the last occurence of <char> and discard the rest.
${parameter%<char>*} will keep everything before the last occurence of <char> and discard the rest.
${parameter%%<char>*} will keep everything before the first occurence of <char> and discard the rest.

Bash has got many more useful expansions, too many to be handy right away.
One that may be very useful is the substitution ${parameter/pattern/string}, if we don't want to always use sed for single line substitution.