This is my $a output:
[root@node1 ~]# echo "${a}"
/dev/vdc1 /gfs1
/dev/vdd1 /elastic
mfsmount /usr/local/flytxt
I gotta store these in an associative array fsmounts with first column as keys and second col as value.
This is my code for that:
declare -A fsmounts
echo "$a" | while read i ; do key=$(echo "$i" | awk '{print $1}'); value=$(echo "$i" | awk '{print $2}');fsmounts[$key]=$value; done;
But when I try to print outside the loop with
[root@node1 ~]# echo ${fsmounts[/dev/vdb1]}
Blank is the output. I think the associative array fsmounts is not actually storing values. Please help me.
But I can actually able to echo fsmounts[$key] inside the loop. See this:
echo "$a" | while read i ; do key=$(echo "$i" | awk '{print $1}'); value=$(echo "$i" | awk '{print $2}');fsmounts[$key]=$value; echo ${fsmounts[$key]}; done;
/gfs1
/elastic
/usr/local/flytxt
The imminent problem associated with your logic is I set variables in a loop that's in a pipeline. Why do they disappear after the loop terminates? Or, why can't I pipe data to read?
You don't need awk or any third party tool at all for this. Just run it over a loop with a read and feed the string via standard input over the loop
declare -A fsmounts
while read -r key value; do
fsmounts["$key"]="$value"
done <<<"$a"
now loop over the array with key and values
for key in "${!fsmounts[@]}"; do
printf 'key=%s value=%s\n' "$key" "${fsmounts[$key]}"
done
More on how to use associative arrays - How can I use variable variables (indirect variables, pointers, references) or associative arrays?