Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Trying to figure out how the environment variables are being set
Top Forums UNIX for Beginners Questions & Answers Trying to figure out how the environment variables are being set Post 302998519 by Don Cragun on Friday 2nd of June 2017 04:28:33 PM
Old 06-02-2017
You use the dot command:
Code:
. filename

to have the current shell execute the commands in filename in your current shell execution environment. This works as long as filename is readable by you. Since the commands in filename were executed in the current shell execution environment, any variables set while it was running will be available for you to use in subsequent commands.

You use the command:
Code:
filename

(without the .) to run the commands in filename in a separate shell execution environment . When the commands in filename are done, that separate shell execution environment is deleted and anything that commands in filename did that did not change other files or were not written somewhere disappear. This doesn't work unless you have permission to execute filename and filename is on your search path for commands (as specified by the PATH environment variable).

But, it is also possible for a shell script to set up an environment and invoke an interactive database session. That script will not end until the interactive session is terminated by logging out of the database session.

All of the above are possible whether or not filename's first character is a <period>. The best way to figure out what a script might do is usually to read the file and look at the manual pages for your system to figure out what the commands in that file are doing.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

how to set up linux environment variables?

Hi I'm using Linux, in the directory /root/my there is a.out. but when I try to run it , the shell indicate "bash:a.out: command not found" but I AM working in this directory. if I use "./a.out" , it works perfectly. can any body tell me how to do a permanent set up so that I can use... (5 Replies)
Discussion started by: dell9
5 Replies

2. UNIX for Advanced & Expert Users

by using c++ how to set environment variables in unix

hi, I am writing c++ code in unix operating system.In that i need to set the environment variable in unix. suppose previously i have environment variable like path="something" now i need to change the path value to some othervalue . so that some other program will access that path value... (1 Reply)
Discussion started by: sada@123
1 Replies

3. Shell Programming and Scripting

Help to set the oracle environment????

Hi, I am trying to set the environment for my oracle database. I have 5 database in an unix box. My idea is to create 5 files for each database with the following script on it. After logging into the unix box ...just by typing the database name....the enviornment for the database... (2 Replies)
Discussion started by: castlerock
2 Replies

4. Shell Programming and Scripting

How does the environment stay set

I am running this pre-script with a post scripts that needs to share the same variables. How do I keep the environment variable settings for the next script to access from the RMAN Script? Prescript #1 #RMAN Script #!/bin/ksh ORACLE_SID=INVPRD;export ORACLE_SID... (1 Reply)
Discussion started by: gzs553
1 Replies

5. Solaris

set environment variable?

I am working with solaris 9 sunBlade150 Box. I Installed a program, need to set the environment variable so that when the executable is entered,it finds the path to the executable. The documentation for the software says: Set the appropriate environment variable: Connect to server failed;... (8 Replies)
Discussion started by: smartgupta
8 Replies

6. Shell Programming and Scripting

Set environment

Hi, I can run shell script from the command line using $ . set If the run the script inside perl script using $var = system("set"); print $var; This prints 0. This command sets up the environment from command line. But when used inside the shell script or perl script it... (2 Replies)
Discussion started by: sandy1028
2 Replies

7. SCO

Help finding where certain environment variables are set

i have two machines that should be identical but on one system there are some oracle environment (ORACLE_SID, ORACLE_HOME, etc...) variables that are not being set for the users. I am trying to find where those environment variables are being set on the system which is working properly. All... (5 Replies)
Discussion started by: kuliksco
5 Replies

8. Shell Programming and Scripting

perl. How to set persistent environment variables

I have test.pl scrit with these few lines. #!/usr/bin/perl $ENV{'ORACLE_SID'} = "D3771"; $ENV{'ORACLE_HOME'} = "/oracle/product/10.2.0/db_1"; When I try . test.pl it throws an error. When I try test.pl, it doesn't reaing the variables I set in the script. -> . test.pl ksh:... (10 Replies)
Discussion started by: MKNENI
10 Replies

9. Shell Programming and Scripting

Need to SET Environment variables

Hi Could you please tell me how to set environment variables in Unix ksh. And how can acess those varibles in shell scripts ( Please give the code with an example) For my scenario. We have written number of shell scripts with hard coded username and password. But if we want to... (1 Reply)
Discussion started by: shyamu544
1 Replies

10. Shell Programming and Scripting

Help with change significant figure to normal figure command

Hi, Below is my input file: Long list of significant figure 1.757E-4 7.51E-3 5.634E-5 . . . Desired output file: 0.0001757 0.00751 0.00005634 . . . (10 Replies)
Discussion started by: perl_beginner
10 Replies

LEARN ABOUT SUSE

starting

starting(7)						 Miscellaneous Information Manual					       starting(7)

NAME

       starting - event signalling that a job is starting

SYNOPSIS

       starting JOB=JOB INSTANCE=INSTANCE [ENV]...

DESCRIPTION

       The  starting  event is generated by the Upstart init(8) daemon when a new instance of a job begins starting.  The JOB environment variable
       contains the job name, and the INSTANCE environment variable contains the instance name which will be empty for single-instance jobs.

       init(8) will wait for all services started by this event to be running, all tasks started by this event	to  have  finished  and  all  jobs
       stopped by this event to be stopped before allowing the job to continue starting.

       This allows jobs to effectively insert themselves as dependencies of other jobs.  The event is typically combined with the stopped(7) event
       by services.

       Job configuration files may use the export stanza to export environment variables from their own environment into the starting event.   See
       init(5) for more details.

EXAMPLE

       A service that wishes to be running whenever another service would be running, started before and stopped after it, might use:

	      start on starting apache
	      stop on stopped apache

       A task that must be run before another task or service is started might use:

	      start on starting postgresql

SEE ALSO

       started(7) stopping(7) stopped(7) init(5)

Upstart 							    2009-07-09							       starting(7)
All times are GMT -4. The time now is 05:54 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy