shell下查看某几行文件

比如需要查看passwd文件9－12行的文件可以用：
[root@localhost dbdata_qeesoo]# cat -n /etc/passwd |awk 'NR >= 9'|awk 'NR <= 4'
     9  mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
    10  news:x:9:13:news:/etc/news:
    11  uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
    12  operator:x:11:0:operator:/root:/sbin/nologin
[root@localhost dbdata_qeesoo]# nl /etc/passwd |awk 'NR >= 9'|awk 'NR <= 4'     
     9  mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
    10  news:x:9:13:news:/etc/news:
    11  uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
    12  operator:x:11:0:operator:/root:/sbin/nologin
[root@localhost dbdata_qeesoo]#

[root@server ~]# cat check_line.sh
read -p "Please enter the file path & name which you want to check : " filename

        if [ "$filename" == "" ]; then
        exit
        fi

test ! -e $filename && echo "The filename $filename DO NOT exist" && exit

read -p "start from which line ?? " start_line
read -p "end of which line ?? " stop_line
if [ "$start_line" -gt "$stop_line" ]; then
        echo "Start line nerver geart then stop line, program end!! please check"
        exit
fi

end_line=`echo "( $stop_line - $start_line ) + 1" |bc`

cat $filename |awk 'NR >= '$start_line''|awk 'NR <= '$end_line''
[root@server ~]#