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  • shell 编程初级

    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" ! 
    "
    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! 
    "    # -e 开启转义  c no line
    echo -e "ok c"
    
    echo "it is a test " > myfile
    
    echo `date`
    
    
    printf "%-10s %-8s %-4s
    " 姓名 性别 体重kg
    printf "%-10s %-8s %-4.2f
    " 郭靖 男 66.1234
    printf "%-10s %-8s %-4.2f
    " 杨过 男 48.6543
    printf "%-10s %-8s %-4.2f
    " 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! 
    
    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 14 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 !
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  • 原文地址:https://www.cnblogs.com/wanghuixi/p/10786460.html
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