批量重命名文件的三种方式

首先建立随机文件

#!/bin/bash

for i in {1..10000}
do
touch $(head -1 /dev/urandom | md5sum | cut -d ' ' -f 1).qas
done

1.rename

这里使用rename

rename 's/\.qas$/\.qwer' *.qas

效率最高，执行命令后，一万个文件几乎没有延迟，瞬间完成
使用time命令检测耗时：

rename 's/\.qas$/\.qwer/' *.qas 0.10s user 0.10s system 99% cpu 0.198 total

2.find命令

find . -type f -name "*.qas" | sed 's/.qas//g' | xargs -i mv {}.qas {}.qwer

耗时：

find . -type f -name "*.qas" 0.02s user 0.02s system 0% cpu 6.509 total
sed 's/.qas//g' 0.02s user 0.00s system 0% cpu 8.484 total
xargs -i mv {}.qas {}.qwer 7.69s user 2.40s system 99% cpu 10.157 total

3.shell脚本

#!/bin/bash

for i in $(ls -1)
do
first_name=$(echo $i | cut -d '.' -f 1)
last_name=$(echo $i | cut -d '.' -f 2)
if [[ $last_name == "qas" ]]
then
mv ${first_name}.qas ${first_name}.qwer
fi
done

耗时：

./changename.sh 28.95s user 5.73s system 115% cpu 30.017 total