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Top Forums Shell Programming and Scripting Is it possible in a shell script to modify itself ?? Post 67271 by sehgalniraj on Tuesday 22nd of March 2005 06:07:06 AM
Old 03-22-2005
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
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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