I have two for loops here
for i in $(cat "firstFile.txt")
do
for j in $(cat "secondFile.txt")
do
if [ "$i" = "$j" ]; then
echo $i[$2] # use first file second column
fi
done
done
and I compare strings and if they are the same i want to echo $i[$2] print firstFile.txt second column. Is it possible to do that?
This can be done easily with awk:
awk 'NR==FNR { a[$1] = $2; next; } { if ($1 in a) { print $1, a[$1]; } }' firstFile.txt secondFile.txt
this will print matched values and second column from first file.
Or you can try this:
#!/bin/bash
while IFS=' ' read -r -a arr; do
while read j; do
if [ "${arr[0]}" = "$j" ]; then
echo "${arr[0]} ${arr[1]}"
fi
done < secondFile.txt
done < firstFile.txt
which assumes first and second columns in firstFile.txt are separated by space and that secondFile.txt has one column.
