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Automatically Rerun a script based on previous execution output

 
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Old 06-25-2009
Automatically Rerun a script based on previous execution output
Hi Experts,

I have a shell script called "updatevs" that is scheduled to run at 6.00 am everyday via cronjob. The cronjob will execute this script and output to a log file. The functionality of this script is to read the database and run a set of commands. This script is generally successful but some times due to network outage or Database being down it fails.

Only in case of a failure i would like to rerun the script every 20 mins for the next 2 hours, if still not successful after 2 hours i would like an email to be triggered to address "xxxxx@abc.com"

There may be several ways to solve this case however I was thinking of writing a small script called "checklog" which reads the log file and searching for the obevious words like "ERROR", when found "Checklog" script will rerun "updatevs" script. I don't think this is the solution as i can't see a way of making this recurring.

Please let me know your valuable feeback on how to acheive this.

Many Thanks
 
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LEARN ABOUT NETBSD

script

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

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-adfpqr] [-c command] [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.

     Option:

     -a      Append the output to file or typescript, retaining the prior contents.

     -c command
	     Run the named command instead of the shell.  Useful for capturing the output of a program that behaves differently when associated
	     with a tty.

     -d      When playing back a session with the -p flag, don't sleep between records when playing back a timestamped session.

     -f      Flush output after each write.  This is useful for watching the script output in real time.

     -p      Play back a session recorded with the -r flag in real time.

     -q      Be quiet, and don't output started and ended lines.

     -r      Record a session with input, output, and timestamping.

     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 used 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).

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.

BSD
								 October 17, 2009							       BSD