Check Variable Value in File and Replace If Needed Bash Script

Question

This question is related to post: Setting Variables Value in a File in Different Directory Using Loops and sed Bash Script

I'm looking for a way to check variable value in file and update it as needed. To change the value I do the following:

#!/bin/bash

cd '/home/me/'
source server.properties
server_var="$server_name"
echo "$server_var"
echo "$application_name"
if [ "$server_var" != "server1" ]; then
    echo "Uncorrect Value"
    sed -i -e 's@server_name=$server_var@server_name=server1@g' server.properties
fi
cd '/home/test/'

Thank you for the suggestion, now my if statement work, but the sed command doesnt update the variable value in the file. Can you please point me in the right direction regarding this issue?

Thank you,

Barmar · Accepted Answer · 2013-04-08 21:48:07Z

0

if [ -n "$server_name" ]
then
    sed ...
fi

BTW, I don't think your set command can set $server_name. It will set $1, $2, etc.

answered Apr 8, 2013 at 21:48

Barmar

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4 Comments

Simply_me Over a year ago

thank you for the answer. I followed the discussion here: stackoverflow.com/questions/2652753/… regarding the set -- $(<server.properties) but it doesn't seem to work. Do you mind explaining what's the condition in [ -n "$server_name"]?

Simply_me Over a year ago

source server.properties seems to do the job.

Simply_me Over a year ago

Actually, I was missing "" instead of ''

Barmar Over a year ago

If you look in that other question, you'll see that the answer uses $1 and $2, just as I said. RTFM.

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