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Operating Systems Linux Setting up crontab, still cant get it to work Post 302514073 by Nasasdge on Thursday 14th of April 2011 06:19:12 PM
Old 04-14-2011
Setting up crontab, still cant get it to work

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.
 

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LINUX-VERSION(1)					      General Commands Manual						  LINUX-VERSION(1)

NAME
linux-version - operate on Linux kernel version strings SYNOPSIS
linux-version compare VERSION1 OP VERSION2 linux-version sort [--reverse] [VERSION1 VERSION2 ...] linux-version list [--paths] DESCRIPTION
linux-version operates on Linux kernel version strings as reported by uname -r and used in file and directory names. These version strings do not follow the same rules as Debian package version strings and should not be compared as such or as arbitrary strings. compare VERSION1 OP VERSION2 Compare version strings, where OP is a binary operator. linux-version returns success (zero result) if the specified condition is satisfied, and failure (nonzero result) otherwise. The valid operators are: lt le eq ne ge gt sort [--reverse] [VERSION1 VERSION2 ...] Sort the given version strings and print them in order from lowest to highest. If the --reverse option is used, print them in order from highest to lowest. If no version strings are given as arguments, the version strings will instead be read from standard input, one per line. They may be suffixed by arbitrary text after a space, which will be included in the output. This means that, for example: linux-version list --paths | linux-version sort --reverse will list the installed versions and corresponding paths in order from highest to lowest version. list [--paths] List kernel versions installed in the customary location. If the --paths option, show the corresponding path for each version. AUTHOR
linux-version and this manual page were written by Ben Hutchings as part of the Debian linux-base package. 30 March 2011 LINUX-VERSION(1)
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