shell 读取文件

#!/bin/bash
content=`cat test.txt`
echo "begin"
for i in $content
do
    echo $i
done

读取前10行

head -n  test.txt

读取后10行

tail -n  test.txt

读取第5行

sed -n "5,1p" test.txt

读取5到10行

sed -n “,10p” test.txt