shell脚本操作备忘录

1. shell判断文件
-a file exists.
-b file exists and is a block special file.
-c file exists and is a character special file.
-d file exists and is a directory.
-e file exists (just the same as -a).
-f file exists and is a regular file.
-g file exists and has its setgid(2) bit set.
-G file exists and has the same group ID as this process.
-k file exists and has its sticky bit set.
-L file exists and is a symbolic link.
-n string length is not zero.
-o Named option is set on.
-O file exists and is owned by the user ID of this process.
-p file exists and is a first in, first out (FIFO) special file or
named pipe.
-r file exists and is readable by the current process.
-s file exists and has a size greater than zero.
-S file exists and is a socket.
-t file descriptor number fildes is open and associated with a
terminal device.
-u file exists and has its setuid(2) bit set.
-w file exists and is writable by the current process.
-x file exists and is executable by the current process.
-z string length is zero.

例：
# 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限 
  if [ ! -x "$myPath"]; then 
  mkdir "$myPath" 
fi 

2.比较字符写法：
-eq    等于
-ne    不等于
-gt     大于
-lt    小于
-le     小于等于
-ge    大于等于
-z    空串
* =    两个字符相等
* !=   两个字符不等
* -n   非空串

3.特殊变量
$0 这个程序的执行名字
$n 这个程序的第n个参数值，n=1..9
$* 这个程序的所有参数
$# 这个程序的参数个数
$$ 这个程序的PID
$! 执行上一个指令的PID
$? 执行上一个指令的返回值