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Full Discussion: Extreme Beginner
Special Forums UNIX Desktop Questions & Answers Extreme Beginner Post 302916002 by jim mcnamara on Friday 5th of September 2014 04:41:03 PM
Old 09-05-2014
Example first column of ls -l
Code:
File type: d== directory l== link
|
|
|
|
|
_
drwxrwxr-x
 ___   ___
  | ___ |
  |  |  |
  |  |  (World) other permissions  r,w,x, and -
  |  group permissions r,w,x, and -
  owner permissions: r == read, w== write, x ==execute  - == permission denied

Permission bits can also be written as octal numbers.
Code:
0 (no permission)
1 execute
2 write
3 execute + write
4 read
5 read + execute
6 read + write
7 read + write + execute

So 755 is
owner read, write, execute
group read, execute
other read, execute

Last edited by jim mcnamara; 09-05-2014 at 05:46 PM..
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stat.h(3HEAD)							      Headers							     stat.h(3HEAD)

NAME
stat.h, stat - data returned by stat system call SYNOPSIS
#include <sys/types.h> #include <sys/stat.h> DESCRIPTION
The system calls stat, lstat and fstat return data in a stat structure, which is defined in <stat.h>. The constants used in the st_mode field are also defined in this file: #define S_IFMT /* type of file */ #define S_IAMB /* access mode bits */ #define S_IFIFO /* fifo */ #define S_IFCHR /* character special */ #define S_IFDIR /* directory */ #define S_IFNAM /* XENIX special named file */ #define S_INSEM /* XENIX semaphore subtype of IFNAM */ #define S_INSHD /* XENIX shared data subtype of IFNAM */ #define S_IFBLK /* block special */ #define S_IFREG /* regular */ #define S_IFLNK /* symbolic link */ #define S_IFSOCK /* socket */ #define S_IFDOOR /* door */ #define S_ISUID /* set user id on execution */ #define S_ISGID /* set group id on execution */ #define S_ISVTX /* save swapped text even after use */ #define S_IREAD /* read permission, owner */ #define S_IWRITE /* write permission, owner */ #define S_IEXEC /* execute/search permission, owner */ #define S_ENFMT /* record locking enforcement flag */ #define S_IRWXU /* read, write, execute: owner */ #define S_IRUSR /* read permission: owner */ #define S_IWUSR /* write permission: owner */ #define S_IXUSR /* execute permission: owner */ #define S_IRWXG /* read, write, execute: group */ #define S_IRGRP /* read permission: group */ #define S_IWGRP /* write permission: group */ #define S_IXGRP /* execute permission: group */ #define S_IRWXO /* read, write, execute: other */ #define S_IROTH /* read permission: other */ #define S_IWOTH /* write permission: other */ #define S_IXOTH /* execute permission: other */ The following macros are for POSIX conformance (see standards(5)): #define S_ISBLK(mode) block special file #define S_ISCHR(mode) character special file #define S_ISDIR(mode) directory file #define S_ISFIFO(mode) pipe or fifo file #define S_ISREG(mode) regular file #define S_ISSOCK(mode) socket file ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
stat(2), types.h(3HEAD), attributes(5), standards(5) SunOS 5.11 30 Aug 2002 stat.h(3HEAD)
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