CODEWITHSUNDEEP
bashshell
unbox-us
unbox-us

Reputation: 423

How to store multiple lines of output in separate variables?

$ external_tool | grep -iE "id1|id2"
id1 Z55Hsh1abm
id2 sFXxu4KzkJbXab08UT

I have to store each id1 and id2 in separate variables mentioned below without executing external_tool twice. Below is how I am doing now but that's not acceptable.

export VAR1=$(external_tool | grep -i id1 | awk '{print $2}')
export VAR2=$(external_tool | grep -i id2 | awk '{print $2}')

Desired output from above should be

$ echo $VAR1
Z55Hsh1abm
$ echo $VAR2
sFXxu4KzkJbXab08UT

How do I store them in separate variables and export them in env var?

Upvotes: 2

Views: 1105

Answers (2)

tshiono
tshiono

Reputation: 22012

Would you please try the following:

#!/bin/bash

while read -r id val; do
    if [[ $id = "id1" ]]; then
        export var1=$val
    elif [[ $id = "id2" ]]; then
        export var2=$val
    fi
done < <(external_tool | grep -iE "id1|id2")

echo "$var1"
echo "$var2"
  • The basic concept is to keep the id's as the output of the command and switch the variable to assign depending on the value of id.
  • The <(command) expression is a process substitution and you can redirect the output of the command to the while loop.

Please note that it is not recommended to use uppercases as a normal variable. That is why I've modified them as var1 and var2.

Upvotes: 3

anubhava
anubhava

Reputation: 784948

You may get this done in a single call to external utility using process substitution using awk:

read -r var1 var2 < <(external_tool | awk -v ORS=' ' '$1~/^(id1|id2)$/{print $2}')

# check variables
declare -p var1 var2

Upvotes: 2

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