shell脚本判断文件和目录是否存在

01

#!/bin/sh

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

03	myFile="/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

05	if [ ! -x "$myPath"]; then

06	mkdir "$myPath"

07

fi

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

31	Conditional 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

63	named 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

73	terminal 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！