how to concatenate values of two variables with an underscore(_) in between

Shell Programming and Scripting
1

Hi,
I'm new to shell programming.

I have two variables a and b
a=val1
b=val2

could anyone kindly post the shell script to concatenate the values of variable a and b with an underscore(_) in between?
The final output should be val1_val2.

2

c="${a}_${b}"
echo "${c}"

3 
$ c="${a}_${b}"
$ echo $c
val1_val2
4

There is some discripency in the result that I am getting in the below shell script.
I have a configuration file having data as
fileTest.conf:
----------------
file=abc
value=123

The Shell Script is:
------------------
ram=`grep 'file=' fileTest.conf | awk -F"=" '{print $2}'`
shyam=`grep 'value=' fileTest.conf | awk -F"=" '{print $2}'`
echo $ram
echo $shyam
c="${ram}_${shyam}"
echo "$c"
Output:
-------
abc
123
_123

The output I want is
abc
123
abc_123
Could someone please let me know what the problem is in the script and how should be the correct script look like?

5

There is nothing wrong with your script if you are using either ksh or bash.
What shell are you using?

6

i'm using bash

7 
You have a "\n" in $ram and problem will be solved if you modify the first awk to be like below

awk -F"=" '{printf"%s",$2}'`
8

Ahmad, are you saying that the OP's script did not work for you? Strange, because it worked just fine for me using both bash and ksh.

9

The script is sound.
You probably have a strange characters in the parameter file.
Try this sed to see what is in the parameter file.

sed -n l fileTest.conf

file=abc$
value=123$