Run tcpdump regarding a match in a log file

YES ! Thank you a lot, that's it. Very usefull script 🙂

For anyone who is asking, this is the manual of the script and how to use it :

USAGE:
./find_error.pl 

Mandatory arguments:

-t, --token='Token'
    the token you are searching for

-l, --log_file='Log File'
    fullpath/filename of log file to use for logging

-p, --packet_num='Packet Number'
    the number of the packets to dump

-o, --output_file='Output File'
    fullpath/filename of the output file to use

Optional arguments:

--zip='zip tar file'
    to zip the final tar file

--nozip='do not zip tar file'
    not to zip the final tar file

-e, --expression='filter expression'
    filtering expression for tcpdump

-i, --interface='Interface'
    Default: 0.0

-s, --snap='Snap length'
    Default: 0

--nnn='use nnn to increasing amounts of internal debugging information appended to the end of each packet'
    Default: nnn

-h, --help='help'
    issue this help message.