Batch Rename Files Using sed and Bash Substring Techniques

1. Rename using sed

# find / -type f -name wolf.log
/wolf.log
/tmp/wolf.log
/root/wolf/wolf.log
# sed -i 's#wolf#yujing#g' find / -type f -name wolf.log
# find / -type f -name "wolf.log" | xargs cat

yujing
yujing
yujing

2. Rename with variable substring replacement

# f=wolf_20170806_10_wolf.jpg
# echo $f
wolf_20170806_10_wolf.jpg
# echo ${f%wolf*.jpg}
wolf_20170806_10_
# mv $f ${f%wolf*.jpg}.jpg
# for f in $(ls *wolf.jpg); do mv $f ${f%wolf*.jpg}.jpg; done

3. Change file extension

# f=wolf_20170806_10_.jpg
# echo ${f/%jpg/log}
wolf_20170806_10_.log
# mv $f ${f/%jpg/log}
# for f in $(ls *.jpg); do mv $f ${f/%jpg/log}; done

These techniques allow fast, automated renaming of large numbers of files without manual editing, leveraging standard Linux utilities and Bash parameter expansion.