08-15-2019
You didn't say which operating system this is but there has to be difference between read and open. If you think about it, if a read updated the access time then all the access times would change when a backup is run which wouldn't be any good if you had to restore the whole lot. However, if an application opens a file then that will update the access time. For example, if you open a file with vi and then immediately quit with :q!, the access time should update because the file has been specifically opened. Additionally, if youvi followed by :w! (even if you haven't changed anything) the file will be written back so the modified date should change.
Now with a directory it is holding the details of its files so if a new file is created the directory is modified. Also, if an application specifically opens a file with that directory in its pathname (and blocks may need to be allocated/deallocated to the file), then the access time should change.
You should be able to verify this on your operating system with a few tests.
Last edited by hicksd8; 08-16-2019 at 05:20 AM..
These 2 Users Gave Thanks to hicksd8 For This Post:
8 More Discussions You Might Find Interesting
1. Solaris
Hi all,
can some one help me in chmod command, and let me know the various combinations for this command.
for : eg chmod -R 777 <dir names>
this gives all rights to all but i want the specific access levels kindly help me out in this issue.
Thank you,
lakshmanan (2 Replies)
Discussion started by: lakshmananl
2 Replies
2. Linux
If i want to display a banner that says Happy Bday, but I want to put that output banner into a file called bday4me,
could I use the command (echo) or (banner -w35) Happy Bday >> bday4me
would this command work? Sorry for asking, but i'm at home just now and don't have access to a UNIX... (3 Replies)
Discussion started by: Cisco
3 Replies
3. Shell Programming and Scripting
Hi all,
Can you tell me how to change the prompt color (only the path part) when I chnange directory with "cd"?
I use the sequence below in ".bashrc" (Solaris 8) to change my prompt colors and I'd like to modify it to change the path color when I cange directory.
PSC() { echo -ne "\"; }... (0 Replies)
Discussion started by: majormark
0 Replies
4. Shell Programming and Scripting
Hi.,
Last modified time of the folder is changing when I view the file inside the directory. Here is the test on sample directory. I believe that ls -l commands gives the time detail w.r.t last modified time. Pl. suggest.
bash-3.2$ mkdir test
bash-3.2$ cd test
bash-3.2$ touch myfile.txt... (2 Replies)
Discussion started by: IND123
2 Replies
5. UNIX for Dummies Questions & Answers
Hey All,
I want to get the access time of files in a directory.
I used ls -lu on a directory and picked a file that had the access time of Mar 1 and used cat to get the contents of the file. Then I used the ls -lu again and the access time changed on that file. Perfect !!
Now if I cat a... (10 Replies)
Discussion started by: vipulgupta0
10 Replies
6. Shell Programming and Scripting
This piece of code is in a shell script I'm trying to modify to run on my system.
sed s:nu\\t.\*:"nu=0"
It's clearly a substitute script which replaces nu\\t.\* with nu = 0.
What exactly does nu\\t.\* demarcate though-- I thought it was just the previous nu = xxxxx (which existed and is... (3 Replies)
Discussion started by: czar21
3 Replies
7. Shell Programming and Scripting
I am trying to do the following task :
export ENV=aaa
export ENV_PATH=$(cd /apps | ls | grep $ENV)
However, it's not working. What's the way to change to directory and search some file in that directory in single command
Please help. (2 Replies)
Discussion started by: saurau
2 Replies
8. Shell Programming and Scripting
When I run the below bash I get the expected output, which is the sum of all matching targets less than 20 in $file1. The filename in the directory is fixed (in bold).
for file1 in /home/cmccabe/Desktop/test/panel/reads/16-0000_EPIL70.txt ; do
bname=`basename $file1`
... (3 Replies)
Discussion started by: cmccabe
3 Replies
LEARN ABOUT ULTRIX
access
access(2) System Calls Manual access(2)
Name
access - determine the accessibility of file
Syntax
#include <unistd.h>
accessible = access(path, mode)
int accessible;
char *path;
int mode;
Description
The system call, checks the given file path for accessibility according to mode. The argument mode is an inclusive OR of the bits R_OK,
W_OK, and X_OK. Specifying the argument mode as F_OK tests whether the directories leading to the file can be searched and whether the
file exists.
The real user ID and the group access list (including the real group ID) are used to verify permissions. This call is useful to set-UID
programs.
Note that only access bits are checked. The call may indicate that a directory is writeable, but an attempt to open the directory fails,
although files are present in the directory. Additionally, a file may appear to be executable, but fails unless the file is in proper for-
mat.
If a path cannot be found, or if the desired access modes are not granted, a -1 value is returned; otherwise, a 0 value is returned.
Diagnostics
Access to the file is denied if any of the following is true:
[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's read, write, and execute mode bits.
Members of the file's group, other than the owner, have permission checked with respect to the group's mode bits. All oth-
ers have permissions checked with respect to the other mode bits.
[EFAULT] The path points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[ENAMETOOLONG] A path component length exceeds 255 characters or the length of path exceeds 1023 characters.
[ENOENT] The file referred to by path does not exist or the path points to an empty string and the environment defined is POSIX or
SYSTEM_FIVE.
[ENOTDIR] A component of the path prefix is not a directory.
[EROFS] Write access is requested for a file on a read-only file system.
[ESTALE] The file handle given in the argument was invalid. The file referred to by that file handle no longer exists or has been
revoked.
[ETIMEDOUT] A connect request or remote file operation fails because the connected party did not respond after a period of time deter-
mined by the communications protocol.
[ETXTBSY] Write access is requested for a pure procedure (shared text) file that is being executed.
See Also
chmod(2), stat(2)
access(2)