08-04-2005
Assigning nawk output to variables
I do a lot of command line scripting to capture data from files or other command output. I've checked in a number of Unix and scripting books but for the life of me I can't find out how to asign field data from nawk output into variables that I can manipulate later. For example, reading a two column file like /etc/hosts:
cat /etc/hosts | nawk '{print $1 "\t" $2}'
How can I get $1 and $2 into variables like $IP and $NAME?
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LEARN ABOUT DEBIAN
inncheck
INNCHECK(8) System Manager's Manual INNCHECK(8)
NAME
inncheck - check inn configuration and database files.
SYNOPSIS
inncheck [ -a ] [ -v ] [ -pedantic ] [ -f ] [ -perm ] [ -noperm ] [ file=value | file ]
DESCRIPTION
Inncheck examines various configuration files and databases and verifies things about them. Things verified depend on the file being
checked, but generally are things like permissions, ownership, syntax errors in config files etc.
Inncheck does not make changes to any files -- it just reports what it thinks may be wrong, and it is up to the operator to fix the prob-
lem.
The set of files checked may be restricted by using file or file=value arguments. For example, putting hosts.nntp causes only the
hosts.nntp(5) file to be checked. Using hosts.nntp=/tmp/hosts.nntp.tst on the command line will cause inncheck to only verify the
hosts.nntp file, and it will perform the checks on the file /tmp/hosts.nntp file instead of the default one.
Valid values for file are:
active
control.ctl
expire.ctl
hosts.nntp
inn.conf
moderators
newsfeeds
overview.fmt
nnrp.access
nntpsend.ctl
passwd.nntp
OPTIONS
-a If any ``file'' value or ``file=value'' pairs (see below) are given, then normally only the files they refer to are checked. Use the
``-a'' flag to specify that all files should be checked regardless. In this case the form file=value will be the more useful.
-v Use the ``-v'' option to get more verbose output.
-pedantic
Use the ``-pedantic option to get reports on things that are not necessarily wrong, but may indicate a bad configuration -- such as
inn.conf(5) missing a key.
-f Use the ``-f'' flag to have inncheck print the appropriate chown/chgrp/chmod command necessary to fix a problem that it reports.
Any other output lines will be prefixed with a ``#'' character to make the output be valid input for a shell. Note that the
``-perm'' flag must be used as well when using this flag.
-perm Inncheck checks all files for permission problems. If the ``-perm'' flag is used, then only the files specified by the file or
file=value command line arguments will be checked for problems other than permission problems.
-noperm
To avoid doing any checking of file permissions or ownership, use the ``-noperm'' option.
EXAMPLES
To have inncheck check all files for syntax and permission problems simply:
inncheck
To have inncheck check all files for permission problems and to verify the syntax of the active and hosts.nntp files do:
inncheck -perm active hosts.nntp
To have inncheck check the test newsfeeds file in /var/tmp/newsfeeds.testing, do:
inncheck newsfeeds=/var/tmp/newsfeeds.testing
To have inncheck check all the files as it normally does, but to specify a different location for the newsfeeds file, so:
inncheck -a newsfeeds=/var/tmp/newsfeeds.testing
BUGS
If the ``-f'' and ``-perm'' options are used together, along with -a or some ``file'' or ``file=value'' arguments that refer to a file with
a syntax problem, then the output will no longer be valid input for a shell.
HISTORY
Written by Brendan Kehoe <brendan@cygnus.com> and Rich Salz <rsalz@uunet.uu.net> This is revision 1.1, dated 1996/10/29.
SEE ALSO
active(5), expire.ctl(5), history(5), hosts.nntp(5), inn.conf(5), newsfeeds(5)
INNCHECK(8)