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https://github.com/JamesonHuang/OpenWrt_Luci_Lua.git
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136 lines
2.6 KiB
Bash
136 lines
2.6 KiB
Bash
#!/bin/bash
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#以下代码中(())可替换为[]
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#--------------------------------------
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echo "var define"
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var="helo" #定义变量不需加$
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echo ${var} #使用变量时加$
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "echo about str"
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#单引号中任何字符均原样输出
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#单引号里不能出现单引号（使用转义符也不行）
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single_str='helo'
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#双引号里可以有变量
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#双引号里可以出现转义字符
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double_str="hello,\" ${single_str} \" "
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echo $single_str
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echo $double_str
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "字符串连接："
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#字符串连接
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#method 1
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echo "method1: ","helo", "helo"
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#method 2
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str="strcat"
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str2="helo"
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echo "method2: ${str},${str2}"
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#method 3
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echo "method3:" ${str} ${str2}
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "get strlen:"
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echo "strlen: ", "${#str}"
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "substr:"
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substr="hello Meizu!"
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echo ${substr:1:4}
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "查找子串: error"
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echo 'expr Meizu "${substr}"'
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "for sh format:"
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for((i=0; i<10; i++)) do
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echo $i
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done
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "if-else:"
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min=10
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max=10
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if ((${min} < ${max})); then
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echo "min < max"
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elif ((${min} > ${max})); then
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echo "min > max"
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else
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echo "min = max"
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fi
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "while"
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var=10
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while ((${var} > 0)); do
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var=$((var-1))
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echo $var
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done
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "执行shell命令，将结果赋给变量:"
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#var=`date`
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var=$(date)
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echo $var
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "echo不换行:"
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# -e 开启转义 \c 不换行
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echo -e "OK! \c oo"
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo -e "前台运行shell:\t\c"
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ls
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echo "后台运行shell："
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ls &
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo "/dev/null:"
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echo "helo" > /dev/null
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo '$?:'
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ls
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echo $?
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echo "---------------------------"
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echo ""
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#--------------------------------------
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echo HELLO'X'
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echo "---------------------------"
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echo ""
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