Linux

OK I have been working on this simple action for a while and I cannot get it to work.
First off im new to the linux command line world. I feel like I am missing something simple.

What I am trying to achieve is that I want this command:

Code:

tcpdump -s2000 -w'flowroute-%H%M.pcap' -G900 -W36 &

to run at 0800 Monday through Friday.

I have setup a crontab that reads:

Code:

0 8 * * 1,2,3,4,5 /root/crontab.txt

the text file I'm using to run the command just says:

Code:

#captures packets in 15min segments and stops after 36 segments
#cronjob is setup for starting at 800 and then would go until 1700
tcpdump -s2000 -w'flowroute-%H%M.pcap' -G900 -W36

I have set the txt as an executable. Im running this from the root.
I have also try adding in an escape character breaks to compensate for the % symbol
what i mean:

Code:

tcpdump -s2000 -w'flowroute-\%H\%M.pcap' -G900 -W36

If any one has any suggestions or ideas for what i could do?
Currently this doesn't do any thing.