Bash 脚本 - 将文件夹名称中的最后一个逗号替换为 &

Question

I need help writing a Bash script. I want it to go through a folder and rename all sub-folders to replace the LAST comma with an ampersand.

for dir in /home/john/Documents/TEST/*; 
do 
    # ***This is the part I can't figure out***
done

Say the folder is '1234 John, James, Jack' - I want it to become '1234 John, James & Jack'

Answer 1

This is a suitable job for a parameter expansion ; techniques using them for this and similar purposes are also covered within BashFAQ #100 .

for f in /home/john/Documents/TEST/*,*/; do  # final / means we match only directories
  f=${f%/}       # remove the last /
  front=${f%,*}  # front is everything before the last comma
  back=${f##*,}  # back is everything after the last comma
  mv -- "$f" "${front}&${back}"
done

See this demonstrated at the online REPL at https://ideone.com/XcY4rw

Answer 2

for dir in /home/john/Documents/TEST/*,*/; 
do 
    newdir=$(echo "${dir}" | sed 's/\(.*\),/\1\&/')
    mv "${dir}" "${newdir}"
done

You can just use use sed to replace the last comma in dir name by &.