Nested for looping in unix shell script

Question

I am facing issue in looping in shell script. I have a requirement where i have to read the content from a flat file and substitue it word by word. For example:

file content is as below:

Test1 001
Test2 002

and my script is as follows:

#!/bin/sh
cd /directorypath/bin/
while read line; do
    for word in $line; do
        for word1 in $line; do
           nohup ./startcmd.sh attribute1=$word attribute2=$word1      
        done
    done
done < /directorypath/test1.txt

but the above snippet is not giving the desired output.

I need the output as below:

./startcmd Test1 001
./startcmd Test2 002

Can anyone please help me in the same.

Thanks

Look into using Perl, Python or Ruby for tasks like this

JoelFan
– JoelFan

2014-10-07 18:55:42 +00:00
Commented Oct 7, 2014 at 18:55 — JoelFan
– JoelFan, Commented Oct 7, 2014 at 18:55
Why do you have same for word in $line; do nested?

anubhava
– anubhava

2014-10-07 18:58:08 +00:00
Commented Oct 7, 2014 at 18:58 — anubhava
– anubhava, Commented Oct 7, 2014 at 18:58

isedev · Accepted Answer · 2014-10-07 19:08:54Z

1

This should work as intended:

while read line; do
    nohup ./startcmd.sh $line
done < /directorypath/test1.txt

$line will contain two words, which will be treated as separate arguments after variable expansion.

Answer to updated question

while read attrib1 attrib2; do
    nohup ./startcmd.sh attribute1=$attrib1 attribute2=$attrib2
done < /directorypath/test1.txt

edited Oct 7, 2014 at 19:08

answered Oct 7, 2014 at 18:57

isedev

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3 Comments

CounterAgent Over a year ago

Hi, the nohup./startcmd has some attributes: I have to run the command as nohup ./startcmd.sh attribute1=$word attribute2=$word1. So i have to seperate the line contents in words.

isedev Over a year ago

The question does not show attribute=value syntax. It shows command line argument syntax. Update the question, then I'll update the answer.

isedev Over a year ago

Updated answer for that use case as well.

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