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我只是想知道你们是否有比我想出的更好的方法来做到这一点。我想要的是制作一个类似“tail -f”的脚本，但它会主动查找字符串并实时打印与该字符串相关的文本。正如您从代码中看到的那样，我正在寻找 MAC 地址，但我想它可以用于其他目的。

我在想必须有更好的方法来做到这一点。也许你们中的一个人知道一个聪明的算法或一个可以做得更好的命令。谢谢你的帮助

import time, os, sys
from datetime import date

# Function to get the file size, it will help us go to the end of a file
def current_file_size(filename):
    file_results = os.stat(filename)
    file_size = file_results[6]
    return file_size

# Check for correct usage
if len(sys.argv) != 2:
    print "Usage: %s <mac_address>" % sys.argv[0]
    sys.exit()

#Get the date in the format that the log uses
now = date.today()
todays_date = now.strftime("%Y%m%d")

#Set the filename and open the file
filename = 'complete.log'
file = open(filename,'r')

#Find the size of the file and move to the end
st_size = current_file_size(filename)
file.seek(st_size)

while 1:
    where = file.tell()   # current position of the file
    time.sleep(2)         # sleep for a little while
    st_size = current_file_size(filename)
    if st_size > where:       # if there's new text
        alotoflines = file.read(st_size-where)    # get the new lines as a group
        # search for the tag+mac address
        found_string = alotoflines.find("<mac v=\"" + sys.argv[1])
        if found_string > 0:
            # search for the immediately prior date instance from where the MAC address
            # is. I know that the log entry starts there
            found_date_tag = alotoflines.rfind(todays_date,0,found_string)
            print alotoflines[found_date_tag:]
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1 回答 1

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Are you doing this as a Python exercise or can you use the shell?

Can you simply pipe the tail output into a grep?

tail -F myfile.txt | egrep --line-buffered myPattern

You could put this into a script and make the file and pattern args.

Using grep you can also add context to your output by using the -A and -B switches.

于 2011-05-12T11:14:45.373 回答