Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #959
Difficulty: Medium
The first virus attack against a Linux machine was by a virus called Stooge,
True or False?
Linux & Unix Commands - Search Man Pages

access(3f) [bsd man page]

ACCESS(3F)																ACCESS(3F)

access - determine accessibility of a file SYNOPSIS
integer function access (name, mode) character*(*) name, mode DESCRIPTION
Access checks the given file, name, for accessibility with respect to the caller according to mode. Mode may include in any order and in any combination one or more of: r test for read permission w test for write permission x test for execute permission (blank) test for existence An error code is returned if either argument is illegal, or if the file cannot be accessed in all of the specified modes. 0 is returned if the specified access would be successful. FILES
/usr/lib/libU77.a SEE ALSO
access(2), perror(3F) BUGS
Pathnames can be no longer than MAXPATHLEN as defined in <sys/param.h>. 4.2 Berkeley Distribution May 27, 1986 ACCESS(3F)

Check Out this Related Man Page

ACCESS(2)							System Calls Manual							 ACCESS(2)

access - determine accessibility of file SYNOPSIS
#include <sys/types.h> #include <unistd.h> #define R_OK 4/* test for read permission */ #define W_OK 2/* test for write permission */ #define X_OK 1/* test for execute (search) permission */ #define F_OK 0/* test for presence of file */ int access(const char *path, mode_t mode) DESCRIPTION
Access checks the given file path for accessibility according to mode, which is an inclusive or of the bits R_OK, W_OK and X_OK. Specify- ing mode as F_OK (i.e., 0) tests whether the directories leading to the file can be searched and the file exists. The real user ID and the group access list (including the real group ID) are used in verifying permission, so this call is useful to set- UID programs. Notice that only access bits are checked. A directory may be indicated as writable by access, but an attempt to open it for writing will fail (although files may be created there); a file may look executable, but execve will fail unless it is in proper format. RETURN VALUE
If path cannot be found or if any of the desired access modes would not be granted, then a -1 value is returned; otherwise a 0 value is returned. ERRORS
Access to the file is denied if one or more of the following are true: [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] The path name exceeds PATH_MAX characters. [ENOENT] The named file does not exist. [EACCES] Search permission is denied for a component of the path prefix. [ELOOP] Too many symbolic links were encountered in translating the pathname. (Minix-vmd) [EROFS] Write access is requested for a file on a read-only file system. [EACCES] Permission bits of the file mode do not permit the requested access, or search permission is denied on a component of the path prefix. The owner of a file has permission checked with respect to the ``owner'' read, write, and execute mode bits, members of the file's group other than the owner have permission checked with respect to the ``group'' mode bits, and all others have permissions checked with respect to the ``other'' mode bits. [EFAULT] Path points outside the process's allocated address space. [EIO] An I/O error occurred while reading from or writing to the file system. SEE ALSO
chmod(2), stat(2). 4th Berkeley Distribution May 22, 1986 ACCESS(2)

15 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script to parse an access-list

Folks, I have a textfile with the config of my router. Part of that config looks like this: router config ... ip access-list extended MyAccessList remark this is my security rule permit host any deny host any ... ip access-list extended YourAccessList ... (25 Replies)
Discussion started by: philipz
25 Replies

2. Programming

semaphore access speed

I am investigating some locking scheme using semaphores. To evaluate basic system speed I run a loop of getting some semaphore info and display it: while : ; do ./semshow; done > res.txt I ran this on 3 boxes - two similar modern HP XEON boxes, one running SCO OpenServer 5, the other is... (46 Replies)
Discussion started by: migurus
46 Replies

3. What is on Your Mind?

How Many Computers Do You Have Root Access At Work?

Here we go again :D At work, where ever that is, on how many computers/servers/workstations do you have root access? Only count unix or linux boxes, thanks (no mainframes, windows or older macs, etc). (34 Replies)
Discussion started by: Neo
34 Replies

4. What is on Your Mind?

Do You Use Your Mobile Phone to Access the Internet?

How much do you use your mobile phone to access the Internet? Vote and Discuss!! (46 Replies)
Discussion started by: Neo
46 Replies

5. Programming

write() issue during a low level hdd access

Hi, I am trying to write zeroes to the hdd using a c program. I don't want to use the dd or ddrescue or any such inbuilt program because of reasons like real time progress, writing custom patterns. (my program is more like an erasure application, but does only zero fill). here are the steps... (35 Replies)
Discussion started by: sponnusa
35 Replies

6. Programming

Oracle accessing from remote host

i have installd oracle 10 on Solaris 10 now i want to access this database from remote machine. -bash-3.00$ tnsping TNS Ping Utility for Solaris: Version - Production on 17-DEC-2010 21:06:51 Copyright (c) 1997, 2005, Oracle. All rights reserved. Used parameter... (23 Replies)
Discussion started by: akhaliq22
23 Replies

7. Linux

C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk)

Hi all, I'm kind of new to programming in Linux & c/c++. I'm currently writing a FileManager using Ubuntu Linux(10.10) for Learning Purposes. I've got started on this project by creating a loopback device to be used as my virtual hard disk. After creating the loop back hard disk and mounting it... (23 Replies)
Discussion started by: shen747
23 Replies

8. Solaris

Access Denied

Hi All, I have a root access for one of the server. But, when i try to cd one particular directory i will get the access denied message. Even though that particular directory is created under root. What would be the cause for this? I really wonder if any one have answer for my... (20 Replies)
Discussion started by: Sricharan21
20 Replies

9. Shell Programming and Scripting

Restrict access to .ksh scripts

Hi, How to restrict access to a .ksh script in such the way that the users can only execute the script, neither read nor write. I tried the below code so that my user alone has the rwx and other users can only execute. chmod 711 sample.ksh But when I logged in as a different user... (26 Replies)
Discussion started by: machomaddy
26 Replies

10. UNIX for Advanced & Expert Users

Access a File as a Device?

I backed up my 320GB hard drive to a file with dd: dd if=/dev/sda of=dev_sda.17-Mar-2012 bs=1048576The main idea was to be able to be able to completely replace my hard drive from this backup if necessary, but I'd also like to be able to restore individual files. I realize I could use this dd... (20 Replies)
Discussion started by: Matt Miller
20 Replies

11. AIX

Unable to access to p5 9131 AIX system

Hi, I am very newbie with AIX system. I have changed the default IP address of HMC1 to our LAN IP address. I can ping to the new ip address but unable to access to ASMI again with the new ip address. Is there a way that I can connect to the console or can reset to the default... (20 Replies)
Discussion started by: lilyn
20 Replies

12. Solaris

Impossible to access on /vol1

hi team, I'm a new with Solaris system and i'm a french, so my english will not be very good but I'll try to explain my problem. I have a Sun server SunFire X4170 with Solaris 10 as OS. since last week I am not able to access on /vol1 anymore. And bellow are the warning messages which are... (20 Replies)
Discussion started by: cerco
20 Replies

13. UNIX for Dummies Questions & Answers

New to Forum & Sun Surefire V210 Access

Purchased a Sun Surefire V210 Server off eBay. Unable to Access the Terminal Mode via the Terminal MGT. Using Windows 7 home, and downloaded the ConEmu. The ConEmu brings up a Command line on the PC, and that's it. Being new to all this, I was expecting a Login prompt to pop up. Read the... (22 Replies)
Discussion started by: screenprintr
22 Replies

14. UNIX for Dummies Questions & Answers

Alternatives to minicom During Remote Access?

Hey All, I am trying to find something similar to minicom, but it needs the ability to be ran during a remote dialup session on the remote device's side. If I dial into the remote server (*using minicom) and then try to run minicom on the remote server I get the following: # minicom... (20 Replies)
Discussion started by: mrm5102
20 Replies

15. UNIX and Linux Applications

Authentication via .htaccess and .htpasswd

I've created .htaccess and use htpasswd comand to create .htpasswd Now when I try to access my protected area I still have loging panel. I checked apache error log lile and found that there is some problem with mismatch password. I use Apache 2.2 .22 Is there some erron in creating... (25 Replies)
Discussion started by: Budrys
25 Replies

Featured Tech Videos