Global variable


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Global variable
# 1  
Old 06-12-2008
Global variable

I have written a shell scritp in which i am using a variable which is declared before a while loop and i am updaitng the variable in while loop and want to use its updated value outside the loop. I am not able to do so, b'coz the scope of the variable is limited to the while loop only and when i am using the variable outside the loop its using the value which i initialized to the variable before the loop.

I think i have to use global variable, but i dont know how to make & use global variable.

Plz respond asap
# 2  
Old 06-12-2008
Quote:
Originally Posted by deepanshu
I have written a shell scritp in which i am using a variable which is declared before a while loop and i am updaitng the variable in while loop and want to use its updated value outside the loop. I am not able to do so, b'coz the scope of the variable is limited to the while loop only and when i am using the variable outside the loop its using the value which i initialized to the variable before the loop.

I think i have to use global variable, but i dont know how to make & use global variable.

Plz respond asap
prefix the variable you want to use with export.
i think this should work. give a try. Also tell which shell you are using.

Thanks
namish

Last edited by namishtiwari; 06-12-2008 at 07:23 AM..
# 3  
Old 06-12-2008
Please define type of script: awk, sed, bash, ksh.

In bash all variables are global unless you declare them local to a function for example.

Show us your code.
# 4  
Old 06-12-2008
i have used export but this is not working, may be i am not using correctly
can u plz give me a example of that
;-)
# 5  
Old 06-12-2008
Before anybody can really help you, you need to tell the forum what particular shell you are using.
# 6  
Old 06-13-2008
i m using bash
and my code is like this

/* Code starts here */

counter=1
file=""
ls -1tr abc* | while read record
do
if [ counter -ne 0 ]
file=${record}
counter=0
fi
done

rfile=${file}

/* EOF */


now my rfile is empty it has no value, but if i echo file variable in while it is having some value, i want to use that value outside. Please suggest me a solution asap
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Global Variable

Hi, I have created a variable say today at the begin having 123 as its value and inside a for loop it gets resolved to some value say 150 in its first iteration. How can I use this value 150 ( 1st iteration's ) outside the scope of for loop ?. In the same way I wanted to use all iteration's... (1 Reply)
Discussion started by: penqueen
1 Replies

2. Shell Programming and Scripting

Global variable value

Hi All, Im new to shell scripting. I am running EgA.sh and setting one global variable XYZ=0 . Also calling another EgB.sh from EgA.sh, changing the value of XYZ=10 but after executing EgB.sh, value of XYZ is still 0. Im expecting it to be 10. Anyone for help. Thanks in Advance. :) (5 Replies)
Discussion started by: paliwal
5 Replies

3. Programming

Structure as global variable

I need to use the below global structure defined in code1.c in another code2.c struct memIOptrs { const char *name; unsigned char *virtptr; }MEM_IO_PTRS; I have a header file for the project codes.h, how should the structure be declared here. Also, what if the structure was... (1 Reply)
Discussion started by: dragonpoint
1 Replies

4. Shell Programming and Scripting

Help with Global Variable

Hi Guyz, I have a requirement like, i have to run a script every hour to count the number of errors encountered. At the end of the day, i need to send them the total number of errors, that have ocurred the entire day. For eg. if 10 errors occurred for starting 1 hr, 5 for next 1 hr, so on.... (1 Reply)
Discussion started by: DTechBuddy
1 Replies

5. Shell Programming and Scripting

global variable not holding its value?

dear there, this kept me awake last night, the variable ${TO} in the following script doesn't seem to hold its value. I have a file ./filelist, which lists all files of interests. I group them by keywords in the filename, and would like to count total number of lines in each group. ... (7 Replies)
Discussion started by: patiobarbecue
7 Replies

6. Shell Programming and Scripting

global variable not being set

In ksh I thought a global variable was any variable in a script or function that did not have the typeset command. I have a global in my calling script which I increment in a function, but the value does not change in the calling script. Here is the code: function f_open_log { typeset -r... (5 Replies)
Discussion started by: robotball
5 Replies

7. Shell Programming and Scripting

global variable in awk

I wrote a awk script file and define some global variables after BEGIN option: BEGIN { cell = ""; alarm = "";} when i run the command: awk -f awk_script inputfile The results are as expected. But when I put awk script into a shell script. Global variables couldn't be understand. I don't... (1 Reply)
Discussion started by: anhtt
1 Replies

8. Shell Programming and Scripting

Global Variable in a script?

How to create a Global variable within a script file. say i want a varaible called LOGFILE to be used within all the script. how to do that? (2 Replies)
Discussion started by: skyineyes
2 Replies

9. Shell Programming and Scripting

Global Variable in awk...

i think..... it's possible use a variable out a awk in the awk ??? ex. A=20071225 awk '{ print "the value is" $a }' OR awk '{ print "........"; c=10; print $c ; c=$A ; print $A}' for a external variable is possbile use in the awk ??? (1 Reply)
Discussion started by: ZINGARO
1 Replies

10. Shell Programming and Scripting

Global variable becomes local

I have encountered a very weird behavior of a global variable in Korn Shell in AIX: A function f1 in my script pipes the output of the function f2 to a program. A variable defined as global using typeset gets its value in f2. That value is not seen in f1. If I remove the pipe ksh recognizes the... (2 Replies)
Discussion started by: odashe318
2 Replies
Login or Register to Ask a Question