I have a directory with several files named as follow:
London_qle_merged Paris_qle_merged Tokyo_qle_merged London_qle_obs Paris_qle_merged Tokyo_qle_merged How can I rename the file having *merged in the filename as follow:
London_Qle_merged Paris_Qle_merged Tokyo_Qle_merged I know that I could do a loop as follow:
for name in Paris London Tokyo do; mv ${name}_qle_merged ${name}_Qle_merged done but is there no other way?
Sure. In ksh/Bash/zsh:
for f in *_merged; do mv -- "$f" "${f/_qle_/_Qle_}" done or in standard shell.
for f in *_qle_merged; do mv -- "$f" "${f%_qle_merged}_Qle_merged" done See also, e.g. Parameter Expansion in BashGuide
I have done this by combination of awk and tr
Command
find . -type f -iname "*merged" |tr -d "./" | awk -F "_" '{print "mv" " " $1"_"$2"_"$3 " " $1"_"toupper(substr($2,1,1))substr($2,2)"_"$3 }' | sh Below merged files
London_qle_merged Paris_qle_merged Tokyo_qle_merged renamed to
London_Qle_merged Paris_Qle_merged Tokyo_Qle_merged This will do the job with no script loops, spawning just a single sub-process:
rename 's/qle/Qle/' *_merged The rename command is your friend here. It is sed for file names. (ensure that you have the Larry Wall version, there is at least two programs with this name).
The following answer is for file content, and thus uses sed. I have used it and re-purposed it to rename. https://unix.stackexchange.com/a/211579/4778
rename -e 's/_(.)/_\u$1/' *_merged It up cases the letter immediately following the first _.
A simpler solution for this specific input
rename 's/qle/Qle/' *_merged 