how to access variables in a config file inside a shell script

Shell Programming and Scripting
1

I'm writing a shell script. I want to put the variables in a separate config files and use those inside my script.
e.g. the config file (temp.conf)will have the values like
mapping=123
file_name=xyz.txt
I want to access these variables in temp.conf(i.e. mapping and file_name) from inside the shell script.
The purpose of the shell script is to check the value of the variable "mapping" .
If mapping=123 then it'll create a file with name equivalent to the value assigned to the
variable file_name (i.e. xyz.txt in this case)
I'm new to Unix Shell scripting.
Could you help me solving this problem?

2

hope below can help you some

while read line;do
eval $line
done < a
echo $mapping
echo $file_name
if [ $1 -eq $mapping ];then
touch $file_name
else
echo "mapping code is incorrect"
fi
3

The way to do this is...
temp.conf should look like this...

export mapping=123
export file_name=xyz.txt

now in the script you can use these variable once you execute the conf file...

. temp.conf
echo $mapping
echo $file_name
4 
awk -F"=" '$1=="mapping" && $2=="123"{
 getline
 filename = $2
 print filename
}' file
5

Hi,
Just explaining the requirement more elaborately:

data in temp.conf :
----------
a=10
b=7
c=8

My requirement:
----------------
check the temp.conf file using awk
find the value of "a" and assign the value to variable "ram" i.e. ram=value of a i.e.10
find the value of "b" and assign it to the variable "shaym" i.e. shyam=value of b i.e.7

find the value of "c" and assign it to the variable "hari" i.e. hari=value of c i.e.8

Could anyone please post the code snippet?

6 
ram=`grep 'a=' temp.conf | awk -F"=" '{print $2}'`
shyam=`grep 'b=' temp.conf | awk -F"=" '{print $2}'`
hari=`grep 'c=' temp.conf | awk -F"=" '{print $2}'`
7

Thanks all of you.
Thanks a lot @rakeshawasthi
it works...

8

no need that many tools. use just awk

set -- $(awk -F"=" '$1=="a"{ram=$2}
$1=="b"{shaym=$2}
$1=="c"{hari=$2}
END{
 print ram,shaym,hari
}' file)
echo $1
echo $2
echo $3

with bash


while IFS="=" read -r a b
do
 case $a in
 "a") ram=$b;;
 "b") shyam=$b;;
 "c") hari=$b;;
 esac
done < file
echo $ram,$shyam,$hari