shell编程的简单代码 一些基础代码 直接上代码
#!/bin/bash myUrl="gggggggg" # 只读变量设置 # readonly myUrl echo "myUrl =" ${myUrl} unset myUrl echo 'myUrl = ' ${myUrli} # string splice your_name='wanghuixi' str="hello I know you are \"$your_name\" ! \n" echo -e $str greeting="hello,"$your_name"!" greeting1="hello,${your_name} !" echo $greeting $greeting1 greeting2='hello, '$your_name'!' greeting3='hello, '${your_name}'ddd!' echo $greeting2 $greeting3 echo ${#your_name} echo ${your_name:1:2} string="runoob is a great site" echo `expr index "$string" io` array_name=(value0 value1 value2 value3) echo $array_name[0] echo ${array_name[@]} #获取数组的长度 echo ${#array_name[@]} echo ${#array_name[*]} # 取得数组单个元素的长度 echo ${#array_name[2]} :<<. zhu shi . echo "can shu: $0" echo "can shu: $1" echo "can shu num : $#" echo "proess ID is : $$" echo "can shu $* " echo "-- \S* --" for i in "$*"; do echo $i done echo "-- \$@ --" for i in "$@"; do echo $@ done :<<. array write readd . my_array=(A B "ccc" D) echo "first :${my_array[0]}" echo "second: ${my_array[2]}" echo " ${my_array[*]}" echo " ${my_array[@]}" echo " ${#my_array[*]}" echo " ${#my_array[@]}" :<<. ji ben yun suan fu . val=`expr 2+2` echo "val: $val" a=10 b=20 val=`expr $a - $b` echo "a -b : $val" val=`expr $a + $b` echo "a + b : $val" if [ $a == $b ] then echo " a = b " fi if [ $a != $b ] then echo "a != b" fi :<<. file yun suan 文件测试运算符 . # echo # read name # echo "$name It is a test" echo "ok! \n" # -e 开启转义 \c no line echo -e "ok \c" echo "it is a test " > myfile echo `date` printf "%-10s %-8s %-4s\n" 姓名 性别 体重kg printf "%-10s %-8s %-4.2f\n" 郭靖 男 66.1234 printf "%-10s %-8s %-4.2f\n" 杨过 男 48.6543 printf "%-10s %-8s %-4.2f\n" 郭芙 女 47.9876 for loop in 1 2 3 4 5 do echo "The value is : $loop" done for str in "this is a string " do echo $str done int=1 while(($int<=5)) do echo $int let "int++" done echo "##########" :<<. echo -n '输入你最喜欢的网站名:' while read FILM do echo "$FILM" done . a=0 until [ ! $a -lt 10 ] do echo $a a=`expr $a + 1` done # case echo "输入 1 到 4 之间的数字" echo "你输入的数字为:" read aNum case $aNum in 1) echo '1';; 2) echo '2';; 3) echo '3';; 4) echo '4';; *) echo '你没有输入 1 到 4 之间的数字';; esac funWithParam(){ echo "第一个参数为 $1 !" echo "第二个参数为 $2 !" echo "第十个参数为 $10 !" echo "第十个参数为 ${10} !" echo "第十一个参数为 ${11} !" echo "参数总数有 $# 个!" echo "作为一个字符串输出所有参数 $* !" } funWithParam 1 2 3 4 5 6 7 8 9 34 73
运行结果：
myUrl = gggggggg myUrl = hello I know you are "wanghuixi" ! hello,wanghuixi! hello,wanghuixi ! hello, wanghuixi! hello, wanghuixiddd! 9 an 4 value0[0] value0 value1 value2 value3 4 4 6 can shu: ./text.sh can shu: can shu num : 0 proess ID is : 23470 can shu -- \S* -- -- $@ -- first :A second: ccc A B ccc D A B ccc D 4 4 val: 2+2 a -b : -10 a + b : 30 a != b ok! \n ok Sun Apr 28 05:15:39 PDT 2019 姓名 性别 体重kg 郭靖 男 66.12 杨过 男 48.65 郭芙 女 47.99 The value is : 1 The value is : 2 The value is : 3 The value is : 4 The value is : 5 this is a string 1 2 3 4 5 ########## 0 1 2 3 4 5 6 7 8 9 输入 1 到 4 之间的数字 你输入的数字为: 2 2 第一个参数为 1 ! 第二个参数为 2 ! 第十个参数为 10 ! 第十个参数为 34 ! 第十一个参数为 73 ! 参数总数有 11 个! 作为一个字符串输出所有参数 1 2 3 4 5 6 7 8 9 34 73 !
