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dunwudunwu
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update shell scripts
1 parent 4fc170b commit 43f4c50

15 files changed

Lines changed: 426 additions & 170 deletions

‎codes/shell/array-demo.sh‎

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#!/usr/bin/env bash
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# 创建数组
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nums=([2]=2 [0]=0 [1]=1)
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colors=(red yellow "dark blue")
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# 访问数组的单个元素
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echo ${nums[1]}
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# Output: 1
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# 访问数组的所有元素
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echo ${colors[*]}
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# Output: red yellow dark blue
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echo ${colors[@]}
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# Output: red yellow dark blue
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printf "+ %s\n" ${colors[*]}
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# Output:
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# + red
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# + yellow
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# + dark
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# + blue
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printf "+ %s\n" "${colors[*]}"
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# Output:
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# + red yellow dark blue
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printf "+ %s\n" "${colors[@]}"
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# Output:
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# + red
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# + yellow
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# + dark blue
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# 访问数组的部分元素
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echo ${nums[@]:0:2}
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# Output:
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# 0 1
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# 访问数组长度
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echo ${#nums[*]}
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# Output:
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# 3
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# 向数组中添加元素
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colors=(white "${colors[@]}" green black)
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echo ${colors[@]}
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# Output:
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# white red yellow dark blue green black
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# 从数组中删除元素
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unset nums[0]
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echo ${nums[@]}
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# Output:
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# 1 2

‎codes/shell/array/arrayDemo.sh‎

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This file was deleted.

‎codes/shell/comment-demo.sh‎

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#!/usr/bin/env bash
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#--------------------------------------------
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# shell 注释示例
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# author：zp
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#--------------------------------------------
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# echo '这是单行注释'
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########## 这是分割线 ##########
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:<<EOF
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echo '这是多行注释'
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echo '这是多行注释'
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echo '这是多行注释'
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EOF
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# Execute: ./comment-demo.sh
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# Output: null

‎codes/shell/operator/operator-demo.sh‎

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#!/usr/bin/env bash
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x=10
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if [[ -n $1 ]]; then
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x=$1
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fi
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y=20
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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val=`expr ${x} + ${y}`
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echo "${x} + ${y} = $val"
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val=`expr ${x} - ${y}`
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echo "${x} - ${y} = $val"
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val=`expr ${x} \* ${y}`
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echo "${x} * ${y} = $val"
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val=`expr ${y} / ${x}`
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echo "${y} / ${x} = $val"
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val=`expr ${y} % ${x}`
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echo "${y} % ${x} = $val"
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if [[ ${x} == ${y} ]]; then
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echo "${x} = ${y}"
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fi
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if [[ ${x} != ${y} ]]; then
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echo "${x} != ${y}"
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fi
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# Execute: ./operator-demo.sh
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# Output:
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# x=10, y=20
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# 10 + 20 = 30
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# 10 - 20 = -10
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# 10 * 20 = 200
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# 20 / 10 = 2
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# 20 % 10 = 0
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# 10 != 20
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# Execute: ./operator-demo.sh 10 30
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# Output:
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# x=10, y=30
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# 10 + 30 = 40
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# 10 - 30 = -20
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# 10 * 30 = 300
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# 30 / 10 = 3
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# 30 % 10 = 0
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# 10 不等于 30

‎codes/shell/operator/operator-demo2.sh‎

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#!/usr/bin/env bash
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x=10
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if [[ -n $1 ]]; then
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x=$1
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fi
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y=20
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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if [[ ${x} -eq ${y} ]];then
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echo "${x} -eq ${y} : x 等于 y"
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else
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echo "${x} -eq ${y}: x 不等于 y"
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fi
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if [[ ${x} -ne ${y} ]]; then
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echo "${x} -ne ${y}: x 不等于 y"
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else
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echo "${x} -ne ${y}: x 等于 y"
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fi
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if [[ ${x} -gt ${y} ]]; then
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echo "${x} -gt ${y}: x 大于 y"
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else
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echo "${x} -gt ${y}: x 不大于 y"
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fi
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if [[ ${x} -lt ${y} ]]; then
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echo "${x} -lt ${y}: x 小于 y"
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else
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echo "${x} -lt ${y}: x 不小于 y"
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fi
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if [[ ${x} -ge ${y} ]]; then
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echo "${x} -ge ${y}: x 大于或等于 y"
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else
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echo "${x} -ge ${y}: x 小于 y"
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fi
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if [[ ${x} -le ${y} ]]; then
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echo "${x} -le ${y}: x 小于或等于 y"
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else
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echo "${x} -le ${y}: x 大于 y"
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fi
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# Execute: ./operator-demo2.sh
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# Output:
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# x=10, y=20
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# 10 -eq 20: x 不等于 y
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# 10 -ne 20: x 不等于 y
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# 10 -gt 20: x 不大于 y
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# 10 -lt 20: x 小于 y
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# 10 -ge 20: x 小于 y
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# 10 -le 20: x 小于或等于 y

‎codes/shell/operator/operator-demo3.sh‎

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#!/usr/bin/env bash
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x=10
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if [[ -n $1 ]]; then
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x=$1
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fi
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y=20
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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if [[ ${x} != ${y} ]];then
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echo "${x} != ${y} : x 不等于 y"
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else
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echo "${x} != ${y}: x 等于 y"
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fi
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if [[ ${x} -lt 100 && ${y} -gt 15 ]];then
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echo "${x} 小于 100 且 ${y} 大于 15 : 返回 true"
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else
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echo "${x} 小于 100 且 ${y} 大于 15 : 返回 false"
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fi
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if [[ ${x} -lt 100 || ${y} -gt 100 ]];then
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echo "${x} 小于 100 或 ${y} 大于 100 : 返回 true"
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else
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echo "${x} 小于 100 或 ${y} 大于 100 : 返回 false"
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fi
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if [[ ${x} -lt 5 || ${y} -gt 100 ]];then
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echo "${x} 小于 5 或 ${y} 大于 100 : 返回 true"
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else
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echo "${x} 小于 5 或 ${y} 大于 100 : 返回 false"
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fi
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# Execute: ./operator-demo3.sh
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# Output:
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# x=10, y=20
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# 10 != 20 : x 不等于 y
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# 10 小于 100 且 20 大于 15 : 返回 true
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# 10 小于 100 或 20 大于 100 : 返回 true
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# 10 小于 5 或 20 大于 100 : 返回 false

‎codes/shell/operator/operator-demo4.sh‎

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#!/usr/bin/env bash
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x=10
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if [[ -n $1 ]]; then
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x=$1
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fi
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y=20
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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if [[ ${x} -lt 100 && ${y} -gt 100 ]]
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then
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echo "${x} -lt 100 && ${y} -gt 100 返回 true"
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else
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echo "${x} -lt 100 && ${y} -gt 100 返回 false"
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fi
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if [[ ${x} -lt 100 || ${y} -gt 100 ]]
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then
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echo "${x} -lt 100 || ${y} -gt 100 返回 true"
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else
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echo "${x} -lt 100 || ${y} -gt 100 返回 false"
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fi
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# Execute: ./operator-demo4.sh
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# Output:
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# x=10, y=20
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# 10 -lt 100 && 20 -gt 100 返回 false
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# 10 -lt 100 || 20 -gt 100 返回 true

‎codes/shell/operator/operator-demo5.sh‎

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#!/usr/bin/env bash
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x="abc"
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if [[ -n $1 ]]; then
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x=$1
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fi
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y="xyz"
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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if [[ ${x} = ${y} ]];then
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echo "${x} = ${y} : x 等于 y"
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else
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echo "${x} = ${y}: x 不等于 y"
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fi
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if [[ ${x} != ${y} ]];then
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echo "${x} != ${y} : x 不等于 y"
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else
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echo "${x} != ${y}: x 等于 y"
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fi
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if [[ -z ${x} ]];then
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echo "-z ${x} : 字符串长度为 0"
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else
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echo "-z ${x} : 字符串长度不为 0"
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fi
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if [[ -n "${x}" ]];then
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echo "-n ${x} : 字符串长度不为 0"
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else
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echo "-n ${x} : 字符串长度为 0"
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fi
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if [[ ${x} ]];then
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echo "${x} : 字符串不为空"
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else
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echo "${x} : 字符串为空"
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fi
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# Execute: ./operator-demo5.sh
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# Output:
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# x=abc, y=xyz
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# abc = xyz: x 不等于 y
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# abc != xyz : x 不等于 y
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# -z abc : 字符串长度不为 0
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# -n abc : 字符串长度不为 0
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# abc : 字符串不为空

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