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Full Discussion: Script to monitor log file
Top Forums Shell Programming and Scripting Script to monitor log file Post 302612043 by Shirishlnx on Saturday 24th of March 2012 11:08:32 AM
Old 03-24-2012
Script to monitor log file

Hi,

Have written a script to monitor linux non standard log file based on line numbers, so each check store $otalinenum ..

then in next check after 10 minutes it compre the current_total_line_num > last_total_line_num then it will parse the log file from last_total_line_num to current_total_line_num with sed as below
Code:
if [ $current_total_line_num -gt $last_total_line_num ]
then
  sed -n ''$oldln','$totl'p;'$totl'q' log-file | grep -i shirish
else 
  grep -i shirish log-file
fi

But here am facing problem if someone truncate the log file or delete some lines from them .. insted normal log rotation then my script parse the entire log file ((with else above)) insted from new updates ..

Please help me with logic to avoid old log alerts when file truncate happen ...
Code:
# cat -n log-file
1 a1 shirish abc anf 
2 a2 shukla anf 
3 a3 shirish anf fd

## After truncate
Code:
# cat -n log-file
1 a1 shirish abc anf 
2 a3 shirish anf fd


--Shirish Shukla

Last edited by Franklin52; 03-24-2012 at 12:30 PM.. Reason: Please use code tags for data and code samples, thank you
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c COMMAND] [-e] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -c COMMAND Run the COMMAND rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. Linux July 30, 2000 Linux
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