详解程序意外中断自动重启shell脚本（以Python为例）

 cd Desktop vim run.s<div style="color:transparent">来源gaodai^.ma#com搞#代!码网</div>h #新建名为run的shell脚本

 #!/bin/bash while [ 1 ];do python run.py done

 chmod 777 run.sh #设置shell脚本权限 ./run.sh   #运行shell脚本

 nohup ./run5.py &

 import os class UrlManager(object): def __init__(self):						#建立两个数组的文件 with open('new_urls.txt','r+') as new_urls: self.new_urls = new_urls.read() with open('old_urls.txt','r+') as old_urls: self.old_urls = old_urls.read() def add_new_url(self, url): 				 #添加url到new_ulrs文件中 if url is None: return if url not in self.new_urls and url not in self.old_urls: with open('new_urls.txt', 'a') as new_urls: new_urls.write(url) else: print('url had done') def add_new_urls(self, urls):				#添加多个url到new_ulrs文件中 # if urls is None or (len(url) == 0 for url in urls): if urls is None: print('url is none') return for url in urls: if urls is None: print('url is none') return else: self.add_new_url(url) def has_new_url(self): return len(self.new_urls) != 0 def get_new_url(self): new_url = get_last_line('new_urls.txt') 	#读取new_urls文件中最后一个url del_last_url('new_urls.txt',new_url)		#删除new_urls文件中最后一个url add_old_urls('old_urls.txt',new_url)		#将读取出来的url添加入old_urls数组中 return new_url def get_last_line(inputfile): filesize = os.path.getsize(inputfile) blocksize = 1024 dat_file = open(inputfile, 'rb') last_line = b"" lines = [] if filesize > blocksize: maxseekpoint = (filesize // blocksize) # 这里的除法取的是floor maxseekpoint -= 1 dat_file.seek(maxseekpoint * blocksize) lines = dat_file.readlines() while ((len(lines) = 2) & (lines[1] == b'\r\n'))): # 因为在Windows下，所以是b'\r\n' # 如果列表长度小于2，或者虽然长度大于等于2，但第二个元素却还是空行 # 如果跳出循环，那么lines长度大于等于2，且第二个元素肯定是完整的行 maxseekpoint -= 1 dat_file.seek(maxseekpoint * blocksize) lines = dat_file.readlines() elif filesize: # 文件大小不为空 dat_file.seek(0, 0) lines = dat_file.readlines() if lines: # 列表不为空 for i in range(len(lines) - 1, -1, -1): last_line = lines[i].strip() if (last_line != b''): break # 已经找到最后一个不是空行的 dat_file.close() return last_line def del_last_url(fname,part): with open(fname,'rb+') as f: a = f.read() a = a.replace(part,b'') with open(fname,'wb+') as f: f.write(a) def add_old_urls(fname,new_url): line = new_url + b'\r' with open(fname,'ab') as f: f.write(line)