while read line into array, bash

Question

I read file, but data of array exist only in loop. At the end of code i try to echo tab[3], but it is empty.

ls -t > lista.txt
N=$(wc -l lista.txt)
N=${N:0:1}
tab[$N]=0


let I=0
while read line 
do
    tab[$I]="$line"
    echo ${tab[$I]}
    ((I+1))
done <lista.txt
echo ${tab[3]} #no Value

choroba · Accepted Answer · 2015-11-26 15:52:35Z

1

((I+1)) doesn't change the value of $I. You have to assign the value to it

(( I = I + 1 ))

or use an increment

# You can use any of the following lines:
(( I++ ))
(( ++I ))
(( I += 1 ))

answered Nov 26, 2015 at 15:52

choroba

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1 Comment

choroba Over a year ago

@Xalion: Yes, because $I stays 0 and it changes and shows ${tab[0]} all the time.

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