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4

rated 0 times [ 4] [ 0] / answers: 1 / hits: 8803 / 1 Year ago, wed, january 11, 2023, 11:21:32

I am trying to write a bash script to print values of the 3 variables. Keep getting errors. What am I doing wrong?

INPUT1=/tmp/dir1

INPUT2=/tmp/dir2

INPUT3=/tmp/dir3



for i in 1 2 3

do 

echo $(INPUT$i)

done

When I run this script, tho output is:

syntax error: operand expected (error token is "/tmp/dir1

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answered 1 Year ago guialk · Accepted Answer

Bash doesn't support that kind of syntax directly. You could use 'eval', however with modern versions of 'bash' the cleanest way imho is via an array

input=( "/tmp/dir1" "/tmp/dir2" "/tmp/dir3" )



for i in {0,1,2}; do echo "${input[i]}"; done

(note that bash arrays are zero-indexed); or to list all elements you can use

for i in "${input[@]}"; do echo "$i"; done