How to set value to variable in UNIX

Shell Programming and Scripting
1

Hi,

I am new to UNIX. I wonder how to set value to variable in UNIX..

my code:
if [ -f /home/batch/sample.txt ]; then EXIST=$a ; else EXIST=$b ; fi'
echo $EXIST

the value of EXIST is empty...

Thanks :slight_smile:

2

Initially assign some values to variable "a" and "b" as
a=10 <sample_data>
b=11 <sample_data> Then check

3

Is $a and/or $b defined ?

4

if I use this code, it works fine.

ssh batch@192.168.3.222 'if [ -f /home/batch/sample.txt ]; then echo "exist" ; else echo "not exist" ; fi'

it will print out "Exist"

But if I use this code, it display "0".

a=0
ssh batch@192.168.3.222 'if [ -f /home/batch/sample.txt ]; then a=1 ; else a=2 ; fi'
echo $a

It seems that the value is not assigned to the variable inside the if-else statement.

5

yes, because you ran it to a different machine

a=`ssh batch@192.168.3.222 'if [ -f /home/batch/sample.txt ]; then echo 1 ; else echo 2 ; fi'`
echo $a
6

Hi ryandegreat25,
Thanks.. it works now... :slight_smile: