I try the code below to store the command output in an array but the array elements cannot be printed after the "while loop" I mean in the last line of my code is there any problem in my code?
#! /bin/bash
ls -a | while read line
do
array[$i]="$line "
echo ${array[ $i ]}
((i++))
done
echo ${array[@]} <------------
The problem is that you add the elements in a subshell. To elaborate:
command1 | command2
causes command2 to be executed in a subshell, which is a separate execution environment. This implies that the variables set in command2 are not available to the current shell, whose execution environment is not affected. You could instead use process substitution to achieve the same:
while read line; do
...
done < <(ls -l)
Please note that parsing ls is not recommended; try using find instead.
command1 is also executed in a subshell.
bash and not sh (POSIX), unfortunately.