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dunwudunwu
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update shell scripts
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‎codes/shell/README.md‎

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‎codes/shell/action/README.md‎

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# Shell 脚本实战
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> 本目录的代码是本人在学习、开发中总结的一些面向实战的 Shell 代码。

codes/shell/practice/system/useradd.sh renamed to codes/shell/action/system/useradd.sh

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‎codes/shell/demos/README.md‎

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# Shell 示例源码
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> 本目录的代码是和 『[一篇文章让你彻底掌握 shell 语言](https://github.com/dunwu/os-tutorial/blob/master/docs/linux/scripts/shell.md)』 相配套的示例代码。

codes/shell/array-demo.sh renamed to codes/shell/demos/array-demo.sh

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codes/shell/comment-demo.sh renamed to codes/shell/demos/comment-demo.sh

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‎codes/shell/demos/debug-demo.sh‎

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#!/usr/bin/env bash
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# 开启 debug
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set -x
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for (( i = 0; i < 3; i++ )); do
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printf ${i}
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done
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# 关闭 debug
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set +x
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# Output:
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# + (( i = 0 ))
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# + (( i < 3 ))
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# + printf 0
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# 0+ (( i++ ))
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# + (( i < 3 ))
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# + printf 1
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# 1+ (( i++ ))
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# + (( i < 3 ))
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# + printf 2
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# 2+ (( i++ ))
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# + (( i < 3 ))
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# + set +x
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for i in {1..5}; do printf ${i}; done
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printf "\n"
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# Output: 12345

‎codes/shell/demos/echo-demo.sh‎

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#!/usr/bin/env bash
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# 输出普通字符串
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echo "hello, world"
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# Output: hello, world
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# 输出含变量的字符串
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echo "hello, \"zp\""
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# Output: hello, "zp"
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# 输出含变量的字符串
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name=zp
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echo "hello, \"${name}\""
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# Output: hello, "zp"
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# 输出含换行符的字符串
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echo "YES\nNO"
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# Output: YES\nNO
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echo -e "YES\nNO" # -e 开启转义
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# Output:
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# YES
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# NO
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# 输出含不换行符的字符串
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echo "YES"
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echo "NO"
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# Output:
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# YES
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# NO
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echo -e "YES\c" # -e 开启转义 \c 不换行
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echo "NO"
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# Output:
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# YESNO
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# 输出内容定向至文件
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echo "test" > test.txt
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# 输出执行结果
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echo `pwd`
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# Output:(当前目录路径)

‎codes/shell/demos/function/function-demo.sh‎

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#!/usr/bin/env bash
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calc(){
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PS3="choose the oper: "
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select oper in + - \* / # 生成操作符选择菜单
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do
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echo -n "enter first num: " && read x # 读取输入参数
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echo -n "enter second num: " && read y # 读取输入参数
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exec
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case ${oper} in
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"+")
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return $((${x} + ${y}))
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;;
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"-")
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return $((${x} - ${y}))
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;;
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"*")
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return $((${x} * ${y}))
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;;
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"/")
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return $((${x} / ${y}))
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;;
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*)
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echo "${oper} is not support!"
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return 0
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;;
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esac
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break
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done
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}
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calc
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echo "the result is: $?" # $? 获取 calc 函数返回值
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# $ ./function-demo.sh
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# 1) +
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# 2) -
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# 3) *
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# 4) /
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# choose the oper: 3
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# enter first num: 10
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# enter second num: 10
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# the result is: 100

‎codes/shell/demos/function/function-demo2.sh‎

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#!/usr/bin/env bash
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runner() {
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return 0
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}
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name=zp
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paramsFunction(){
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echo "函数第一个入参：$1"
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echo "函数第二个入参：$2"
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echo "传递到脚本的参数个数：$#"
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echo "所有参数："
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printf "+ %s\n" "$*"
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echo "脚本运行的当前进程 ID 号：$$"
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echo "后台运行的最后一个进程的 ID 号：$!"
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echo "所有参数："
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printf "+ %s\n" "$@"
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echo "Shell 使用的当前选项：$-"
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runner
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echo "runner 函数的返回值：$?"
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}
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paramsFunction 1 "abc" "hello, \"zp\""
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# Output:
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# 函数第一个入参：1
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# 函数第二个入参：abc
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# 传递到脚本的参数个数：3
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# 所有参数：
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# + 1 abc hello, "zp"
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# 脚本运行的当前进程 ID 号：26400
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# 后台运行的最后一个进程的 ID 号：
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# 所有参数：
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# + 1
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# + abc
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# + hello, "zp"
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# Shell 使用的当前选项：hB
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# runner 函数的返回值：0

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