【原创】用python实现shell的tail操作

#!/usr/bin/env python
#coding=utf-8
import os,sys,time,getopt

lastline=''
linelist=[]
def getNewLine(filename, count):
global lastline
global linelist
cmd='tail -'+count+' '+filename
while(1):
#line5=os.popen('tail -5 speedy_result.txt').read()
newcount=0
line5=os.popen(cmd).read()
lines=line5.split('\n')
for line in lines:
if(line <= lastline): continue
newcount+=1
lastline=line
linelist=[]
linelist.append(line)

time.sleep(0.5)
if(newcount<=0):
linelist=[]

return linelist