shell脚本学习笔记.pdf

shell脚本学
2016/02/10 17:46 -
1.
1. a=10
2. echo -e "Value of a is $a \n"
3. 这里 -e 表示对转义字符进行替换。如果不使用 -e 选项，将会原样
件的各种属性：
1. #!/bin/sh
2. file="/var/www/tutorialspoint/unix/"
3. if[ -r $file]
4. then
5. echo "File has read access"
6. else
7. echo "File does not have read access"
8. fi
9. if[ -w $file]
10. then
11. echo "File has write permission"
12. else
13. echo "File does not have write permission"
14. fi
15. if[ -x $file]
16. then
17. echo "File has execute permission"
18. else
19. echo "File does not have execute permission"
20. fi
21. if[ -f $file]
22. then
23. echo "File is an ordinary file"
24. else
25. echo "This is sepcial file"
26. fi
27. if[ -d $file]
28. then
29. echo "File is a directory"
30. else
31. echo "This is not a directory"
32. fi
33. if[ -s $file]
34. then
35. echo "File size is zero"
36. else
37. echo "File size is not zero"
38. fi
39. if[ -e $file]
40. then
41. echo "File exists"
42. else
43. echo "File does not exist"
44. fi运行结果：
File has read access
File has write permission
File has execute permission
File is an ordinary file
This is not a directory
File size is zero
File exists
文件测试运算符列表
操作符 说明 举例
-b file 检测文件是否是块设备文件，如果是，则返回 true。