02-02-2007
I don't disagree with anything you have said, however...
Quote:
Originally Posted by sb008
Based on the fact that was stated that the format of the files is:
filename<date>.dat
the regular expression would be strict enough, since it's fair to assume that whatever program produces these output files produces them with a valid date in the file name.
If you're going to assume that whatever program produces these output files produces them with a valid date in the file name, 1) you've made your regular expression unnecessarily strict; that is, you could have just as easily used filename[0-9][0-9][0-9][0-9][0-9][0-9].dat (although less reasonable, it's certainly easier to type), and 2) you're assuming the original poster's request is irrelevant, since his requirement was to "match the filenames like so, ls filename[01-12][01-31][00-99].dat thus guaranteeing [his] date format".
Quote:
Originally Posted by sb008
If other files are around with a similar format, your regular expression, even though it's more strict, would be as useless as mine. Unless ofcourse you promote the filosophy that a statement is better if it has a smaller chance on producing errors.
In most cases here on unix.com, I do promote that philosophy.
Quote:
Originally Posted by sb008
The only valid option, if files with similar patterns are around, is to isolate the date part from the filename and use e.g. a date conversion command/tool on that pattern and test for the return code.
I agree, and that is something I have considered. However, I don't know of one offhand, and although I could write one, unless you can suggest an existing one to me, I can not offer it.
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LEARN ABOUT DEBIAN
arp2ethers
ARP2ETHERS(8) System Manager's Manual ARP2ETHERS(8)
NAME
arp2ethers - convert arpwatch address database to ethers file format
SYNOPSIS
arp2ethers [ arp.dat file ]
DESCRIPTION
arp2ethers converts the file /var/lib/arpwatch/arp.dat (or the file specified on the command line) into ethers(5) format on stdout. Usu-
ally arp.dat is an ethernet/ip database file generated by arpwatch(8). The arpwatch daemon in Debian will create different arp.dat depend-
ing on its configuration. All of them will be available at /var/lib/arpwatch/.
FILES
/var/lib/arpwatch - default directory for arp.dat
arp.dat - ethernet/ip address database
SEE ALSO
arpwatch(8), ethers(5), rarp(8), arp(8),
BUGS
Please send bug reports to arpwatch@ee.lbl.gov.
AUTHORS
Original version by Craig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley,
CA.
Modified for the Debian Project by Peter Kelemen, with additions from Erik Warmelink.
The current version is available via anonymous ftp:
ftp://ftp.ee.lbl.gov/arpwatch.tar.gz
This manual page was contributed by Hugo Graumann.
ARP2ETHERS(8)