Rename multiple files (only test, no actual changes made)

$ rename -n "s/BAA\ //" *

Rename multiple files

$ rename "s/BAA\ //" *
$ rename "s/source\ string/target\ string/" <file_template>
$ rename txt text *.txt
$ rename 's/\.html$/\.txt/' *.html

Remove part of the filename

$ for fn in *.flac; do newfn=$(echo $fn | cut -c 4-); echo will move $fn to $newfn; done
$ for fn in *.flac; do echo mv $fn `echo $fn | cut -c 4-`; done
$ for fn in *.flac; do mv $fn `echo $fn | cut -c 4-`; done

Add string to filename

$ for fn in *.flac; do echo mv "$fn" newstring_"$fn"; done
$ for fn in *.flac; do mv "$fn" newstring_"$fn"; done

Remove and add to filename one liner

$ for fn in *.flac; do mv $fn `echo $fn | cut -c 4-`; done && for fn in *.flac; do mv "$fn" newstring_"$fn"; done

Rename file extention only

$ for file in *.zip; do mv "$file" "`basename "$file" .zip`.cbz"; done

Replace string in filename

$ find . -type f -name '*.flac' | while read FILE ; do newfile="$(echo ${FILE} |sed -e 's/previousstring/newstring/')" ; mv "${FILE}" "${newfile}" ; done

Rename files and directories to lowercase

$ find . -depth -exec rename 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;
$ for f in `find`; do mv -v "$f" "`echo $f | tr '[A-Z]' '[a-z]'`"; done
$ rename 'y/A-Z/a-z/' *

Rename files ordering by date (dry)

$ n=1; ls -tr | while read i; do echo "$(printf %02u $n)-$i"; n=$((n+1)); done

Rename files ordering by date (apply)

$ n=1; ls -tr | while read i; do mv "$i" "$(printf %02u $n)-$i"; n=$((n+1)); done

if you have more than a hundred files use %03u to get 001-, 002- ... 999-, if more than a thousand use %04u etc and to apply to files only (not directories, symlinks etc) use

$ n=1; ls -tr | while read i; do if [ -f "$i" ]; then mv "$i" "$(printf %05u $n)_$i"; n=$((n+1)); fi; done

The command above looks a little complicated but basically it uses 'ls -tr' to list the files from oldest to newest then 'pipes' this list (using '|' operator) to a while loop which 'reads' each file name and formats it appropriately. I like doing it this way using the 'read' command since it works when the filenames have spaces in them. The cryptic formating for the printf command is borrowed from C syntax, so it can appear strange if you're not familiar with the programming language. There's always a dozen or more ways to accomplish a task, I always make notes when I find some new method, that's a good way to learn over time. Once you get used to it you'll find yourself cursing when stuck at a dos type prompt from windows (I have to install cygwin on my windows machines, otherwise I can't work efficiently)

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