shell脚本判断文件和目录是否存在

01#!/bin/sh

02myPath="/var/log/httpd/"

03myFile="/var /log/httpd/access.log"

04# 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限

05if [ ! -x "$myPath"]; then

06mkdir "$myPath"

07fi

08 # 这里的-d 参数判断$myPath是否存在

09 if [ ! -d "$myPath"]; then

10 mkdir "$myPath"

11 fi

12 

13 # 这里的-f参数判断$myFile是否存在

14 if [ ! -f "$myFile" ]; then

15 touch "$myFile"

16 fi

17 # 其他参数还有-n,-n是判断一个变量是否是否有值

18 if [ ! -n "$myVar" ]; then

19 echo "$myVar is empty"

20 exit 0

21 fi

22 

23 # 两个变量判断是否相等

24 if [ "$var1" = "$var2" ]; then

25 echo '$var1 eq $var2'

26 else

27 echo '$var1 not eq $var2'

28 fi

29-f 和-e的区别

30 

31Conditional Logic on Files

32 

33 

34 

35-a file exists.

36 

37-b file exists and is a block special file.

38 

39-c file exists and is a character special file.

40 

41-d file exists and is a directory.

42 

43-e file exists (just the same as -a).

44 

45-f file exists and is a regular file.

46 

47-g file exists and has its setgid(2) bit set.

48 

49-G file exists and has the same group ID as this process.

50 

51-k file exists and has its sticky bit set.

52 

53-L file exists and is a symbolic link.

54 

55-n string length is not zero.

56 

57-o Named option is set on.

58 

59-O file exists and is owned by the user ID of this process.

60 

61-p file exists and is a first in, first out (FIFO) special file or

62 

63named pipe.

64 

65-r file exists and is readable by the current process.

66 

67-s file exists and has a size greater than zero.

68 

69-S file exists and is a socket.

70 

71-t file descriptor number fildes is open and associated with a

72 

73terminal device.

74 

75-u file exists and has its setuid(2) bit set.

76 

77-w file exists and is writable by the current process.

78 

79-x file exists and is executable by the current process.

80 

81-z string length is zero.

82 

83 

84 

85是用 -s 还是用 -f 这个区别是很大的！