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Why you need expr here..?

just use

IP=$(grep IP /tmp/input.txt | cut -d "=" -f2)
PC=$(grep PC /tmp/input.txt | cut -d "=" -f2)

okay thanks sir

change this a.txt file into cfg file.. and include the cfg path inside the script...

for example..
a.cfg
------
STEPS=3
STEP_DURATION=100
INTERVAL=60

sample.sh

#!/bin/sh

....