linux删除大量文件的6种方法

首先建立50万个文件

test  for i in $(seq 1 500000)
for> do
for> echo test >>$i.txt
for> done

1 rm

test  time rm -f *
zsh: sure you want to delete all the files in /home/hungerr/test [yn]? y
zsh: argument list too long: rm
rm -f *  3.63s user 0.29s system 98% cpu 3.985 total

由于文件数量过多，rm不起作用。

2 find

 test  time find ./ -type f -exec rm {} ;
find ./ -type f -exec rm {} ;  49.86s user 1032.13s system 41% cpu 43:19.17 total

3 find with delete

 test  time find ./ -type f -delete       
find ./ -type f -delete  0.43s user 11.21s system 2% cpu 9:13.38 total

4 rsync
首先建立空文件夹blanktest

 ~  time rsync -a --delete blanktest/ test/
rsync -a --delete blanktest/ test/  0.59s user 7.86s system 51% cpu 16.418 total

5 Python

import os
import time
stime=time.time()
for pathname,dirnames,filenames in os.walk('/home/username/test'):
     for filename in filenames:
         file=os.path.join(pathname,filename)
         os.remove(file)
 ftime=time.time()
 print ftime-stime

 ~  python test.py
494.272291183

大概用时8分钟。

6 Perl

 test  time perl -e 'for(<*>){((stat)[9]<(unlink))}'
perl -e 'for(<*>){((stat)[9]<(unlink))}'  1.28s user 7.23s system 50% cpu 16.784 total