Below is my program, a.sh :
A=10 B=20 C=0 D=1
for var in {A,B,C,D}
do
if [ $var = 0 ]
then
echo "$var value is 0"
else
echo "Ok"
fi
done
Result is :
# sh a.sh
Ok
Ok
0 value is 0 <==== Instead of this I want "C value is 0"
Ok
How can we do this ?
With bash:
A=10
B=20
C=0
D=1
for var in A B C D; do
if [ ${!var} -eq 0 ]; then
echo "$var value is 0"
else
echo "Ok"
fi
done
Use -eq to compare integer values (or use (( ${!var} == 0 )) or (( !${!var} )) which is the same thing), and use ${!var} to get the value of the variable whose name is stored in the variable var.
Or, a bit neater but essentially the same (still in bash):
for var in A B C D E; do
case ${!var} in
0) printf '%s value is 0\n' "$var" ;;
*) echo 'Ok' ;;
esac
done
This treats the values as strings, not as integers.
