Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

For loop with one variable as the name of other

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting For loop with one variable as the name of other
# 1  
Old 10-13-2011
For loop with one variable as the name of other
Hello all,

I find it hard to explain what I need so I will post the code


Code:
OVZINCLUDE="16810 16811 1689"
PLUS_16810="test"
PLUS_16811="test"
for VPS in $OVZINCLUDE
        do

          echo "Dumping VPSes: $OVZINCLUDE "
           vzdump --compress --snapshot ${PLUS_$VPS} $VPS
done

The idea is when for parses 16810 to use PLUS_16810 as vzdump argument, same for 16811 and etc.

The code above gives bad substitution error.
I know I can use eval for the naming of the variable as something_$VARIABLE, but how to use it in reverse?

p.s. That is in
bash --version
GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu)
Last edited by click; 10-13-2011 at 10:23 AM..
# 2  
Old 10-13-2011
Would this do it for you:
Code:
OVZINCLUDE="16810 16811 1689"
for VPS in $OVZINCLUDE
do
   echo "Dumping VPSes: $OVZINCLUDE "
    mPlus='PLUS_'${OVZINCLUDE}
   vzdump --compress --snapshot ${mPlus}
done

This User Gave Thanks to Shell_Life For This Post:
click
# 3  
Old 10-13-2011
Yes! With little correction

Code:
OVZINCLUDE="16810 16811 1689"
PLUS_16810="help"
for VPS in $OVZINCLUDE
do
   echo "Dumping VPSes: $OVZINCLUDE "
    mPlus='PLUS_'${VPS}
   vzdump --compress --snapshot ${!mPlus}
done

That way it purses the variable only when for is processing PLUS_$VPS

Thanks a lot!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

[Solved] How to increment and add variable length numbers to a variable in a loop?

Hi All, I have a file which has hundred of records with fixed number of fields. In each record there is set of 8 characters which represent the duration of that activity. I want to sum up the duration present in all the records for a report. The problem is the duration changes per record so I... (5 Replies)
Discussion started by: danish0909
5 Replies

2. Shell Programming and Scripting

Array Variable being Assigned Values in Loop, But Gone when Loop Completes???

Hello All, Maybe I'm Missing something here but I have NOOO idea what the heck is going on with this....? I have a Variable that contains a PATTERN of what I'm considering "Illegal Characters". So what I'm doing is looping through a string containing some of these "Illegal Characters". Now... (5 Replies)
Discussion started by: mrm5102
5 Replies

3. UNIX for Dummies Questions & Answers

Loop and variable not exactly variable: what's wrong

Hello guys, This truly is a newbie question. I'm trying to make a loop to execute simultaneous commands indefinitely while using variable. Here is how my mess looks like (this is just an example): #!/bin/bash IP=`shuf -n 1 IP.txt` # I figured this would be easier to select random lines... (4 Replies)
Discussion started by: bobylapointe
4 Replies

4. Shell Programming and Scripting

printing variable with variable suffix through loop

I have a group of variables myLINEcnt1 - myLINEcnt10. I'm trying to printout the values using a for loop. I am at the head banging stage since i'm sure it has to be a basic syntax issue that i can't figure out. For myIPgrp in 1 2 3 4 5 6 7 8 9 10; do here i want to output the value of... (4 Replies)
Discussion started by: oly_r
4 Replies

5. Shell Programming and Scripting

[SHELL: /bin/sh] For loop using variable variable names

Simple enough problem I think, I just can't seem to get it right. The below doesn't work as intended, it's just a function defined in a much larger script: CheckValues() { for field in \ Group_ID \ Group_Title \ Rule_ID \ Rule_Severity \ ... (2 Replies)
Discussion started by: Vryali
2 Replies

6. Shell Programming and Scripting

how to get the variable in while loop outside of it?

bash-3.00$ cat compare.sh #NOTE : 1.Filename must not have space for the script to work. # 2.Script wont work if symlinks are there instead of proper filenames. #!/bin/bash #set -x #############################VERIFYING THE EXISTENCE OF DUPLICATE FILENAMES IN THE SUPPLIED FILENAMES... (3 Replies)
Discussion started by: munish259272
3 Replies

7. Shell Programming and Scripting

Help with variable using loop

Hi I have webserver that I do read data from. Data are stored like this: Huston |1 Portland |2 Hazen |1 Minneapolis |4 Albany |1 Pittsburg |1 Albany |1 Huston |1 Portland|1 Hazen |2 Albany |2 Huston |1 Hazen |1 Script #!/bin/sh user="admin" (1 Reply)
Discussion started by: Jotne
1 Replies

8. Shell Programming and Scripting

For loop Variable

Hi, Is it possible to assign one variable to other. eg. v1="table1" v2="20000" I want table1 to assign 20000 table1=20000 Is there any way? Thanks (2 Replies)
Discussion started by: SushilM
2 Replies

9. Shell Programming and Scripting

loop through variable

i have these data in a variable "$test" BUNGA TERATAI 3 5055 ITH 1 1 JADE TRADER 143W ITH 4 4 MOL SPLENDOR 0307A ITH 3 3 the red coloured are the ones that i want to take and compare what I need to do is to take out the red coloured and then compare to another variable, if same then... (0 Replies)
Discussion started by: finalight
0 Replies

10. Shell Programming and Scripting

variable in a for loop

Hi... i am trying to ping my servers .The hostnames are present in a file .They are separated by spaces in the file . i am doing the following : a=1 for name in $(cat host2 |cut -d" " -f$a) do echo Pinging server $name ping -c5 $name a=$a+1 done It is... (3 Replies)
Discussion started by: sars
3 Replies
Login or Register to Ask a Question