摘自:http://blog.51cto.com/lynnteng0/804520 describe="it's a describe by yourself" if echo "$describe" | grep -q '^[a-zA-Z0-9]\+$'; then echo "ok" else echo "invalid" fi describe="it's a describe by yourself"
function IsNumberic(Vaule:String):Boolean; //判断Vaule是不是数字 var i:integer; begin result:=true; //设置返回值为 是(真) Vaule:=trim(Vaule); //去空格 to length(Vaule) do //准备循环 begin 中的任一个 begin result:=false; //返回值 不是(假) exit; //退出函数 end; end; end; function IsUpperC
1.判断字符串为空 if [ -z "$str" ]; then echo "empty string" fi 2.判断文件是否存在 if [ -f /home/builder/.profile ]; then echo "File exists;" fi 3.逻辑非 if [ ! -f /home/builder/.bash_profile ]; then echo "here!"else echo "te