首先建立50萬個文件
復制代碼 代碼如下:
test for i in $(seq 1 500000)
for> do
for> echo test >>$i.txt
for> done
1 rm
復制代碼 代碼如下:
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
由于文件數量過多，rm不起作用。
2 find
復制代碼 代碼如下:
test time find ./ -type f -exec rm {} /;
find ./ -type f -exec rm {} /; 49.86s user 1032.13s system 41% cpu 43:19.17 total
大概43分鐘。3 find with delete
復制代碼 代碼如下:
test time find ./ -type f -delete
find ./ -type f -delete 0.43s user 11.21s system 2% cpu 9:13.38 total
用時9分鐘。4 rsync
首先建立空文件夾blanktest
復制代碼 代碼如下:
~ time rsync -a --delete blanktest/ test/
rsync -a --delete blanktest/ test/ 0.59s user 7.86s system 51% cpu 16.418 total
16s，很好很強大。5 Python
復制代碼 代碼如下:
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
復制代碼 代碼如下:
~ python test.py
494.272291183
大概用時8分鐘。
6 Perl
復制代碼 代碼如下:
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
