#!/bin/bash
#propram:
#This program shows "Hello Shell!".
fileisexist=/aa/b.info
test -f $fileisexist && echo 'exist' || echo 'not exist'
test -d $fileisexist && echo 'exist' || echo 'not exist'
test -r $fileisexist && echo 'exist' || echo 'not exist'
echo "$pidfile does not exist, process is not running"。echo for %%%%a in ("if not exist %%2/nul md %%2" "if exist %%2/nul cd %%2") do %%%%a >>c:/temp.bat。例如：“if exist test.txt. else echo test.txt.missing ”，注意命令中的“.”。
echo "$pidfile does not exist, process is not running"。例如：“if exist test.txt. else echo test.txt.missing ”，注意命令中的“.”。if(fileisexist=="exist"){。
exit 0
用if else代替&& ||
例子2：用[]作判断要注意空格
例子3：用if%20[];then%20fi
例子4：多分支判断elif
例子5：case%20in
例子6.while
#!/bin/sh
int=1
while%20[%20$int%20-lt%2010%20];do
echo%20$int;
((int++));
done
例子7.until
例子8：for
#!/bin/bash
echo%20'输入一下数字';
read%20number;
for((i=0;i<=$number;i++));do
echo%20$i;
done;
8.%20function函数、
demoFun(){
echo%20"这是我的第一个%20shell%20函数!"
}
echo%20"-----函数开始执行-----"
demoFun
echo%20"-----函数执行完毕-----"
9.执行shell文件时可以传参执行
function%20print(){
echo%20"your%20input%20is%20$1";
}
case $1 in
"one") print 1
;;
