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Top Forums Shell Programming and Scripting some information on error checking Post 302175568 by grumpf on Friday 14th of March 2008 12:07:20 PM
Old 03-14-2008
hi vinayrao,

i guess what this person intended was to filter a log file for error messages.
To do this propperly you need to learn regular expressions (see google).

0. make a copy of a logfile you can use as example
1. take a look at the file (using less,more) to find a common pattern for error messages
2. construct a filter for that pattern

lets assume that all error messages start with ERROR.
that you can use the cmd 'grep' to filter for lines starting with ERROR (grep "^ERROR" logfile)
now you need to get some order in the resulting output. you may need to sort it (see: sort) and remove
double lines (see: uniq) or to cut certain fields (see: cut).


If your UNIX box is propper installed you
may take a look into the man pages for these commands. iff you have the gnu coreutils
you can also get a lot of help from 'info coreutils' (note: first read how to use the info reader).
 

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CHECKBASHISMS(1)					      General Commands Manual						  CHECKBASHISMS(1)

NAME
checkbashisms - check for bashisms in /bin/sh scripts SYNOPSIS
checkbashisms script ... checkbashisms --help|--version DESCRIPTION
checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence of bashisms. It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected. Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported by POSIX"; this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability. In cases where POSIX and Debian Policy disagree, checkbashisms by default allows extensions permitted by Policy but may also provide options for stricter checking. OPTIONS
--help, -h Show a summary of options. --newline, -n Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.) --posix, -p Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n). --force, -f Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears to be a shell wrapper). --extra, -x Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi- tive which may be ignored. For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set. --version, -v Show version and copyright information. EXIT VALUES
The exit value will be 0 if no possible bashisms or other problems were detected. Otherwise it will be the sum of the following error val- ues: 1 A possible bashism was detected. 2 A file was skipped for some reason, for example, because it was unreadable or not found. The warning message will give details. SEE ALSO
lintian(1). AUTHOR
checkbashisms was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by Julian Gilbey <jdg@debian.org>. DEBIAN
Debian Utilities CHECKBASHISMS(1)
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