topic Re: environment variable is not set when executing script.. in Operating System - Linux

environment variable is not set when executing script..

Friend_2 — Tue, 16 Nov 2010 07:09:55 GMT

Hi,

i am executing script .script executed successfully. but environment variable is not set...

Sript:
sid1.sh

code:

output:

[oracle@test1 shell]$ sh sid1.ksh

********************************************************************************
The current ORACLE_SID value is testdb
********************************************************************************
The following are valid instance names along with the ORACLE_HOME value:

1 : bingo
2 : +ASM
3 : star

********************************************************************************

Do you want to change ORACLE_SID [Y/N]? \c
y
Enter Slno of the SID from above list : \c
2
Oracle SID: +ASM
[oracle@test1 shell]$ echo $ORACLE_SID
testdb

Re: environment variable is not set when executing script..

Goran Koruga — Tue, 16 Nov 2010 07:30:39 GMT

Hello.

Source the script if you want to do this:

source sid1.ksh

(using ". sid1.ksh" has the same effect).

Regards,
Goran

Re: environment variable is not set when executing script..

Steven Schweda — Wed, 17 Nov 2010 14:22:18 GMT

> [...] environment variable is not set...

Actually, the environment variables _were_
set, but they were set in the wrong process.

> [oracle@test1 shell]$ sh sid1.ksh
> [...]

This runs a shell ("sh"), which runs the
shell script, which runs its own shell
("#!/bin/ksh"), and that "/bin/ksh" process
is where the environment variables were set.
When that process exits, its environment
(with the desired changes) disappears.

> [...] ". sid1.ksh" [...]

That causes the current shell to read the
commands in the file, so that when those
commands set environment variables, the
variables are set in the current shell's
environment, not in some (transient)
sub-shell's environment.

> #!/bin/ksh

A line like this serves no purpose here,
because this is not a complete shell script
-- the current shell must always read
("source") the file (". file"). (Thus, you
couldn't use the same file with a C shell.)