Tenth Line

题目大意：给一个多行的文件，让你写一段shell脚本把文件的第10行输出来。

方法一：

# Read from the file file.txt and output the tenth line to stdout.
count=0
while read line && [ $count -le 10 ]
do
    count=$[$count+1]
    if [ $count -eq 10 ]
    then
        echo $line
        exit
    fi
done < file.txt

方法二：

# Read from the file file.txt and output the tenth line to stdout.
sed -n '10p' file.txt

方法三：

# Read from the file file.txt and output the tenth line to stdout.
awk '{if(NR==10) print $0}' file.txt

方法四：（方法三的简化）

# Read from the file file.txt and output the tenth line to stdout.
awk 'NR==10' file.txt