Is it possible in a shell script to modify itself ??

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Is it possible in a shell script to modify itself ??

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03-22-2005

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Is it possible in a shell script to modify itself ??

We are running a quiz and the data collected from the quiz is submitted to the database. My requirement is to write a shell script to get these submitted records.

I should be able to run this shell script at any time and the records it returns should be the ones submitted after the script was last run.

For eg : Assume i ran a script today and the number of records returned are 19, if i ran this script again tomorrow, the records i shd get should be the one submitted after today (excluding 19 records).

i will prefer using a variable in shell script which will hold the last run time.

for eg :
In my shell script can i declare a variable (last_run_time) in the begining, Use this variable thru the code and before exiting the shell script update this variable with the current date

.... shell script start .....
last_run_time=16/03/2005 10:10:10
..
spool test
select * from table1 where creattion_date > $last_run_time;
spool off
..

****
Here i wanted to update the last_run_time variable (declared above) with the current date, so that the next time i run the script i shd get the records which are inserted after i last ran the query
****
.... shell script end .....

Regards

sehgalniraj

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proto

proto(4)						     Kernel Interfaces Manual							  proto(4)

NAME

       proto - prototype job file for at

SYNOPSIS

DESCRIPTION

       When a job is submitted to or the job is constructed as a POSIX shell script (see at(1)).  The job file is created in as follows:

	 o  creates a header describing the job as an job or a job.  jobs submitted to all queues other than queue are listed as jobs.	The header
	    is:

	    for an		job, or

	    for a		job.

	 o  A set of POSIX shell commands is added to make the environment (see environ(5)) for the job the same as the current environment.

	 o  then copies text from the prototype file to the job file, except for special variables that are replaced by other text:

	    Replaced by the current working directory.

	    Replaced by the current file size limit (see
		   ulimit(2)).

	    Replaced by the current umask (see
		   umask(2)).

	    Replaced by the time at which the job should be run,
		   expressed as seconds since January 1, 1970, 00:00 Coordinated Universal Time, preceded by a colon.

	    Replaced by text read by
		   from the standard input (that is, the commands provided to to be run in the job).

	 o  When a job is submitted to queue queue, uses the file as the prototype file if it exists.  Otherwise, it uses the file

EXAMPLES

       The following file creates commands to change the current directory, file size limit, and umask in the job to their  respective	values	as
       they existed when was originally run.  These commands are inserted before the commands in the job:

SEE ALSO

       at(1), queuedefs(4).

STANDARDS CONFORMANCE

																	  proto(4)