用文件名做为参数，统计所有参数文件的总行数
[root@centos6mini 3.19]# ./linshi /etc/passwd /etc/sysconfig/network-scripts/ifcfg-eth1 /etc/passwd
89
[root@centos6mini 3.19]# cat linshi
#!/bin/bash
sumhang=0
while [ $# -gt 0 ];do
hang=$( cat $1 | wc -l )
let sumhang+=hang
shift
done
echo $sumhang
4、用二个以上的数字为参数，显示其中的最大值和最小值
方法一：
#!/bin/bash
min=$1 #最小值等于第一个数值
max=$1 #最大数等于第一个数值
while [ $# -gt 0 ];do #进行数值数量进行判断，做循环
value=$1 #定义变量
if [ $value -gt $max ];then #当第二个数大于第一个数时
max=$value #最大值等于后一个数值，对max从新赋与新的值
elif [ $value -lt $min ];then #当第二个数大于第一个数时
min=$value #最小值等于后一个数值 对min从新赋与新的值
fi
shift #不管前面判断是否成立，都进行数列左移，
done
echo "min $min"
echo "max $max"
方法二：
#!/bin/bash
if [ $# -lt 2 ];then #对输入数字数量进行检测
echo "type more than two numbers"
exit 1
fi
small=$(echo $* |xargs -n1 |sort -n |head -n 1) #进行数值排序
big=$(echo $* |xargs -n1 |sort -n |tail -n 1)
echo "Maximum number is $big"
echo "Minimum number is $small"
[root@localhost ~]# echo 1 -3 -99 46 7 32 43 2133 312 |xargs -n1 #以一数列进行显示
1
-3
-99
46
7
32
43
2133
312
read 示例：
[root@centos6mini 3.19]# while read -p "type your name: " name ;do echo your is $n$name; done type your name: zhangsan your is zhangsan type your name: lisi your is lisi type your name: wangwu your is wangwu type your name: ^C [root@centos6mini 3.19]# read bing < test。txt [root@centos6mini 3.19]# echo $bing hello ^C [root@centos6mini 3.19]# while read name ; do echo $name ;done # 没有指定输入 123 #输入 123 #输出 qwe #输入 qwe #输出 asd #输入 asd #输出 zxc #输入 zxc #输出 ^C^[[A^C [root@centos6mini 3.19]# while read name ; do echo $name ;done <6 #name为变量，输入来自文件文件内容读取完了，循环停止 hello qweqew 12341234 asdas ads sda sad asd as asd as
read 示例：
显示UID小于1000的为sys user，大于等于1000的为comm user。
[root@centos6mini 3.19]# cat linshi
#!/bin/bash
while read usline ;do #通过read ，定义变量值usline
usuid=$( echo $usline |cut -d: -f3 ) ，#引用变量usline ，并定义变量usuid
usname=$( echo $usline |cut -d: -f1 ) #引用变量usline ，并定义变量usname
#if [ $usuid -lt 1000 ];then #进行判断
if (( $usuid < 1000 )) ;then #进行判断（两种方式均可以）
echo "$usname is a sys user"
else
echo "$usname is a comm user"
fi
done < /etc/passwd #每次循环引用文件内容一行，进行操作，引用完了，循环停止。
[root@centos6mini 3.19]# ./linshi
root is a sys user
bin is a sys user
daemon is a sys user
adm is a sys user
lp is a sys user
sync is a sys user
shutdown is a sys user
halt is a sys user
mail is a sys user
uucp is a sys user
operator is a sys user
games is a sys user
gopher is a sys user
ftp is a sys user
nobody is a sys user
vcsa is a sys user
saslauth is a sys user
