Visit Our UNIX and Linux User Community


nested variables


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting nested variables
# 1  
Old 11-08-2007
nested variables

Is there any way to do variable nesting using sh?

For example:

example_1="a test string"
example_2="another test"
example_3="etc..."
i=2

echo ${example_$i}

The shell reports:
sh: ${example_$i}: bad substitution




If not, maybe someone could suggest another method. Thanks in advance.

Kevin.
# 2  
Old 11-08-2007
Code:
$ example_1="a test string"
$ example_2="another test"
$ example_3="etc..."
$ i=2
$ eval echo \$example_$i
another test

# 3  
Old 11-08-2007
Thanks porter, I can work with that!!

K.
# 4  
Old 07-30-2008
Many thanks from me too!!

Previous Thread | Next Thread
Test Your Knowledge in Computers #858
Difficulty: Medium
AJAX is a set of web development techniques using many web technologies on the server-side to create asynchronous web applications.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Passing awk variables to bash variables

Trying to do so echo "111:222:333" |awk -F: '{system("export TESTO=" $2)}'But it doesn't work (2 Replies)
Discussion started by: urello
2 Replies

2. UNIX for Dummies Questions & Answers

[Solved] Nested If

I am having a problem with a nested if. I am sure I am overlooking something. I check for the existence of $Pidfl3 and it exists, o this condition I then want to check for the existence of a next file and remove it. The first if is executed, but on the second if I get test: argument expected. My... (4 Replies)
Discussion started by: Charles Swart
4 Replies

3. Shell Programming and Scripting

Running a script with multiple variables like 25 variables.

Hi All, i have a requirement where i have to run a script with at least 25 arguements and position of arguements can also change. the unapropriate way is like below. can we achieve this in more good and precise way?? #!/bin/ksh ##script is sample.ksh age=$1 gender=$2 class=$3 . . .... (3 Replies)
Discussion started by: Lakshman_Gupta
3 Replies

4. Shell Programming and Scripting

Nested if else

Hi, i m trying to create script which logic is like below. if ; then x=`cat /tmp/testoutput.log | grep STOP | wc -l` y=`cat /tmp/testoutput.log | grep RUN | wc -l` if ; then echo "process stop" if ; then echo "process running " else echo "file not found" fi ----------------... (2 Replies)
Discussion started by: tapia
2 Replies

5. Shell Programming and Scripting

two while nested loops

for server in $(echo `cat /tmp/ScanHosts_${USERSNAME}.TXT`) do for portnumber in $(echo `cat /tmp/ScanPorts_${USERSNAME}.TXT`) do #echo ${server} ${portnumber} ... (3 Replies)
Discussion started by: SkySmart
3 Replies

6. Shell Programming and Scripting

Complex bash/sed, variables and nested quotes

Ok, this one isn't for everybody, it's pretty tough and I've spent a good deal of time on it without figuring it out yet. Can anybody get this script to work: #!/bin/bash cq_fname="%let outputfile="/user/cq_"$1".csv";" sed "29s/.*/\"$cq_fname\"/" file1.sas >... (3 Replies)
Discussion started by: nocloud
3 Replies

7. Shell Programming and Scripting

Two variables in output file name nested for loops

I am trying to use two nested for loops to process some files and then create a new file using both variables in the output file name. I have several files in this naming style: S1_L3_all_R1.fastq S1_L3_all_R2.fastq S1_L4_all_R1.fastq S1_L4_all_R2.fastq . . S1_L8_all_R1.fastq... (3 Replies)
Discussion started by: aminards
3 Replies

8. Shell Programming and Scripting

Optimize the nested IF

Hi, I have to assign a value for a varaiable based on a Input. I have written the below code: if then nf=65 elif then nf=46 elif then nf=164 elif then nf=545 elif then nf=56 elif then (3 Replies)
Discussion started by: machomaddy
3 Replies

9. Shell Programming and Scripting

grep variables nested within grep

Help, I have a ksh script that has some variables within the grep command, I am then setting another variable that greps the variables that have greps within them. cat $WORKINGDIR/meter_list.txt | while read meter do serialnum=$(cat masterlogfile.txt | grep "$meter" | awk '{ print $19 }'... (7 Replies)
Discussion started by: srichard9
7 Replies

10. Programming

How to convert byteArray variables to HexaString variables for Linux?

Hello everybody, I am having problem in converting byte array variables to Hexa String variables for Linux. I have done, converting byte array variables to Hexa String variables for Windows but same function doesn't work for linux. Is there any difference in OS ? The code for Windows is given... (2 Replies)
Discussion started by: ritesh_163
2 Replies

Featured Tech Videos