Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: some information on error checking
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).
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

error checking in bash

Could someone please advise on a good way to implement error checking in a script? i am taking input from a file, iserting it's values into two commands and sending the output of each to seperate log files. i need to check those log files for for an occurance of 'error', stop the command if... (3 Replies)
Discussion started by: gubten
3 Replies

2. Shell Programming and Scripting

Error Checking Problem

Here is my problem I'm designing a script that will have to accept user input from the command line using the read command. The problem is that I have to check the input which should be in the format of <first name> <last name> <phone number (8 digits long)> The input can also be ... (4 Replies)
Discussion started by: pokeycam
4 Replies

3. Shell Programming and Scripting

Error code checking

I'm trying to create a directory from my Perl script. Only if the there was an error I want to let the user know about it. So if the folder exists is ok. This is what I think should work: `mkdir log 2>/dev/null`; if($? == 0 || $? == errorCodeForFileExists) { everyting is fine } else {... (3 Replies)
Discussion started by: jepombar
3 Replies

4. Shell Programming and Scripting

Need help with error checking

I am creating a script that will automatically use sftp to connect to a site and download a file, extract the tar and then delete the tar file once completed. What I am stuck on is the error checking for this process. Here is the code so far: Now this works for me as is, but i need... (0 Replies)
Discussion started by: xianoth
0 Replies

5. Shell Programming and Scripting

Perl error checking question

I am not very good with perl but trying to force myself to start learning... I have a script that calls three other scripts in variables. I want to use a if statement to check the exit status and not sure how to do it.. This is basically what I have, the individual scripts print either a Y or... (1 Reply)
Discussion started by: i9300
1 Replies

6. Shell Programming and Scripting

Error Checking in Shell scripts.

What i need to do is when the database connection is not successful , the script should move to next list i.e skip the current. But when i do this - if ; then break; fi The script break but it goes to the condition - if ; then for LIST in $LISTS do for TABLE in $TABLES do... (2 Replies)
Discussion started by: dinjo_jo
2 Replies

7. Shell Programming and Scripting

File exist checking error

Hi all, I have following code: export USERID=user export BATCHHOSTIP=190.113.3.324 remotePath=/home/user fileName=redbook.txt EXIST=`ssh $USERID@$BATCHHOSTIP 'if ; then echo 0; else echo 1 ; fi'` echo $EXIST II run the code from other server. The redbook.txt file is exist in... (1 Reply)
Discussion started by: suigion
1 Replies

8. Programming

Error Checking

Hey guys i am facing a problem in my sql statement. I am trying to check if there is such a value in the database. Code: string NewMovie = "ww"; string queryText ; queryText = "Select * from movie_info WHERE movie_title = '"+ NewTitle +"'"; ... (1 Reply)
Discussion started by: gregarion
1 Replies

9. Shell Programming and Scripting

Error checking help.

I am currently wrapping up a assignment for one of my classes. I need help writing some error checking logic. The problems I am having are: keeping track of the records I have deleted and reported it back using echo. I have no idea how to do this. ensuring that line numbers fall... (1 Reply)
Discussion started by: Boltftw
1 Replies

10. Shell Programming and Scripting

New advice on error checking

HI All, Whenever I write a shell script I always check if a command got executed successfully, even for the commands like cd, mv, rm and others, and even for the cases when there is ALMOST nothing to stop this commands from executing with success. so I am wondering if it is an overkill. I am... (1 Reply)
Discussion started by: rdogadin
1 Replies

LEARN ABOUT DEBIAN

cut

CUT(1)								   User Commands							    CUT(1)

NAME

       cut - remove sections from each line of files

SYNOPSIS

       cut OPTION... [FILE]...

DESCRIPTION

       Print selected parts of lines from each FILE to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --bytes=LIST
	      select only these bytes

       -c, --characters=LIST
	      select only these characters

       -d, --delimiter=DELIM
	      use DELIM instead of TAB for field delimiter

       -f, --fields=LIST
	      select only these fields;  also print any line that contains no delimiter character, unless the -s option is specified

       -n     (ignored)

       --complement
	      complement the set of selected bytes, characters or fields

       -s, --only-delimited
	      do not print lines not containing delimiters

       --output-delimiter=STRING
	      use STRING as the output delimiter the default is to use the input delimiter

       --help display this help and exit

       --version
	      output version information and exit

       Use  one,  and only one of -b, -c or -f.  Each LIST is made up of one range, or many ranges separated by commas.  Selected input is written
       in the same order that it is read, and is written exactly once.	Each range is one of:

       N      N'th byte, character or field, counted from 1

       N-     from N'th byte, character or field, to end of line

       N-M    from N'th to M'th (included) byte, character or field

       -M     from first to M'th (included) byte, character or field

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by David M. Ihnat, David MacKenzie, and Jim Meyering.

REPORTING BUGS

       Report cut bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report cut translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for cut is maintained as a Texinfo manual.  If the info and cut programs are properly installed at  your	site,  the
       command

	      info coreutils 'cut invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							    CUT(1)
All times are GMT -4. The time now is 11:36 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy