[leetcode] shell - Tenth Line

# Read from the file file.txt and output the tenth line to stdout.
 
#!/bin/sh
 
line_number=$(wc -l ./file.txt | awk '{print $1}')
#echo $(expr ${line_number})
 
cat ./file.txt | while read line
do
        if [ ${line_number} -eq 10 ]
        then
                echo $(cat file.txt | sed -n 10p)
        break
        else
            echo $(cat file.txt | sed -n 10p)
            break
        fi
done