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What is Bash or Linux command for extracting the common string out of 2 partly similar, partly different strings

how to get variable

a="How good is it to"

out of

b="How good is it to die in defending fatherland"
c="How good is it to live in dedicating oneself to nation"

With a bash loop over the strings:

i=0
a=
while [[ $b:i:1 == $c:i:1 ]]; do a+=$b[i]; ((++i)); done

Or, with less manipulation:

i=0
while [[ $b:i:1 == $c:i:1 ]]; do ((++i)); done
a=$b:0:i

Note that this results in the string:

printf -- '-->%s<--n' "$a"
-->How good is it to <--

... with the trailing space, since that character is common to both source strings.

Try the following code:

b="How good is it to die in defending fatherland"
c="How good is it to live in dedicating oneself to nation"
a=()
count=0
for i in $b[@]
do
 if [ "`echo "$c[@]" | grep $i`" ]; then
 a[count]=$i
 count=$((count+1))
 fi
done
echo $a[@]

i have redirected value of variable "a" and "b" to file "file1" and "file2"

Below is command i have used to fetch the common strings

Let me know for any suggestions or corrections

for i in 1..13; do awk -v i="$i" 'NR==FNRa[$i];next($i in a)print $i' file1 file2 ; done|sed '/^$/d'| perl -pne "s/n/ /g"

output

How good is it to in