从许多文本文件中快速删除前n行

使用 tail . 怀疑任何事情都可能更快:

tail -n +3 input.txt > output.txt

把它包在你选择的循环中。但我真的怀疑SED慢了整整一吨——正如您所说,磁盘I/O通常是最终的瓶颈。

我认为这将比启动SED更快:

import os
import shutil

path = '/some/path/to/files/'
for filename in os.listdir(path):
    basename, ext = os.path.splitext(filename)
    fullname = os.path.join(path, filename)
    newname = os.path.join(path, basename + '-out' + ext)
    with open(fullname) as read:
        #skip first two lines
        for n in xrange(2):
            read.readline()
        # hand the rest to shutil.copyfileobj
        with open(newname, 'w') as write:
            shutil.copyfileobj(read, write)

for file in *.ext
do
    sed -i.bak -n '3,$p' $file 
done

或者只是

sed -i.bak -n '3,$p' *.ext