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Full Discussion: How to preserve the value of a variable from being overwritten?
Top Forums Shell Programming and Scripting How to preserve the value of a variable from being overwritten? Post 302908971 by veeresh_15 on Saturday 12th of July 2014 07:36:25 AM
Old 07-12-2014
Oracle How to preserve the value of a variable from being overwritten?
Hi All,

I am new new to unix.com, I have a question related to shell scripting.
We have a Oracle database backup shell script, which can be used for taking full, incremental & archive log backup based on the parameters passed.

Within the script we export a variable as
Code:
export gv_shell_id=$(date "+%y%m%d_%H%M%S_")$$

So for every execution of backup, we will have a unique gv_shell_id. We store the gv_shell_id along with other backup details in a database table for reporting purpose.

If we have executed a full backup, it will set a gv_shell_id and if simultaneously some one kicks off archive log backup, it will reset the gv_shell_id with different value.

And this is causing a wrong entry of gv_shell_id for full backup in the table.

Basically i want to make the variable itself unique for every execution to avoid such problem.
I tried using gv_shell_id_$$=$(date "+%y%m%d_%H%M%S_")$$

but it throws below error.
Code:
gv_shell_id_$$=$(date "+%y%m%d_%H%M%S_")$$
-bash: gv_shell_id_24357=140712_073709_24357: command not found

Can you please help me in generating a unique variable so that it doesn't get overwirtten by any other execution of same script.
Last edited by Scott; 07-12-2014 at 09:37 AM.. Reason: Please use code tags
 

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LEARN ABOUT CENTOS

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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