12-10-2008
figure out the number different values a certain row takes
Hi,
If we are concerned with each column,usually this is very easy using the wc command in shell, however,the problem is:
I have file with 8 rows but 100 columns.
1.I want to find the number of different values a certain "row" takes
2.The values are in fact characters for, example, "john", "david,"steve"
3.Sometimes the value is empty, when the value is empty, I want to ignore it completely when I am trying to figure out the number different values a certain row takes.
Seems awk is the most efficient tool.
Thanks,
john
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LEARN ABOUT DEBIAN
unshadow
UNSHADOW(8) System Manager's Manual UNSHADOW(8)
NAME
unshadow - combines passwd and shadow files
SYNOPSIS
unshadow password-file shadow-file
DESCRIPTION
This manual page documents briefly the unshadow command, which is part of the john package. This manual page was written for the Debian
GNU/Linux distribution because the original program does not have a manual page. john, better known as John the Ripper, is a tool to find
weak passwords of users in a server.
The unshadow tool combines the passwd and shadow files so John can use them. You might need this since if you only used your shadow file,
the GECOS information wouldn't be used by the "single crack" mode, and also you wouldn't be able to use the '-shells' option. On a normal
system you'll need to run unshadow as root to be able to read the shadow file.
SEE ALSO
john(8), mailer(8), unafs(8), unique(8).
The programs are documented fully by John's documentation, which should be available in /usr/share/doc/john or other location, depending on
your system.
AUTHOR
This manual page was written by Jordi Mallach <jordi@debian.org>, for the Debian GNU/Linux system (but may be used by others).
John the Ripper and mailer were written by Solar Designer <solar@openwall.com>. The complete list of contributors can be found in the CRED-
ITS file in the documentation directory.
john June 03, 2004 UNSHADOW(8)