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about shell variables and environment variables

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http://stackoverflow.com – I'm reading Wrox, Beginning Linux Programming. But I've got a question about shell variables. Here is a shell script named test.sh: #! /bin/bash read test echo $test exit 0 Then I chmod the script: $ chmod +x test.sh $ ./test,sh When I type "ok", it echos the "ok". But when I returned to the shell interface, I typed: $ echo $test It returned nothing... I don't know why $test doesn't return "ok" just like the script does... And the book doesn't metion it... Thanks in advance:) (HowTos)

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Submitted by fooubuntu on 02/01/2013

Stories similar to about shell variables and environment variables

I have searched stackexchange and other website for the difference. It is said that environment variable is inherited in child processes but shell variables are not. However the following test shows shell variables are seen in child process just as environment variables. Any suggestion please?

It is said that environment variables are inherited in child processes but shell variables are not. However the following test shows shell variables are seen in child process just as environment variables.

I have a shell script that exports values of variables when executed. The same values will be used in another script. How to run this script(test.sh) in cron.

#!/bin/sh export I="10" echo $I

I will be using root access for cron. I tried this command :

*/5 * * * * /home/ubuntu/backup/.test.sh

I checked with environment variables, nothing is updated.

First I write a configfile with all my parameters like this

path="/home/test/"

I name it test.conf.

Then I write a shell script with this content, name it test, and make it executable with chmod +x.

#!/bin/bash #read the config file .

Hi, doing exercises in A Practical Guide to Linux Commands, Editors, and Shell Programming by Mark G. Sobell. One of the exercises involves a script that is passed in the name of an environment variable.

So lets say I have an environment variable $test that I exported with value "testing".

So lets say the script is named foobar, and is invoked:

I set the a array as an environment variable in this manner eg.

I wrote a test.c:

#include <unistd.h> #include <stdio.h>

int main() { while(1) { sleep(1); printf("====test====\r\n"); } return 0; }

then i compile it : gcc ./test.c -o ./test and the i wrote a shell script:

#!/bin/sh ./test &

and then i made this script to be executed automatically on system boot. then I login to the Linux system using secur

sourcing env output 11 weeks 3 days ago

I have some shell code I need to be debug, so I had the code dump its environment into a file

env > env.txt

and with my testing script I want to source it, test.sh:

.

Shell Script Desktop Shortcut 13 weeks 4 days ago

So i tried making a desktop shortcut which executes a very simple shell script. But when i double click/right click->execute it, it does nothing. (or atleast i think it does nothing)

heres how my shortcut and shell script looks: Note the shortcut has "Terminal" set to 1, and i hope that means that it opens the shell script in a new terminal window..