04-04-2007
read() without changing atime ?
Hey,
First of all I want to know
How do I see the atime of a file ?? Whats the command ??
I think
ls -l shows the last modified time right ? Because when I use cat to read a file, the timestamp shown by ls -l does not change.
Its not ls -lu ! man ls did not help ! How do I see the last access time of a file in unix ???
Now my next question is:
My C program reads a file using read(). But I do not want the last access time of the file to change. So, I am using utime() to update the atime and mtime of the file back to what it was before the read.
But the problem, the update will fail if the program does not have write permissions on the file. If the file is read only, the program will not be able to modify its attributes (am I right ?).
can you guys please help me out here
thanks,
Varun
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a tab delimited file which has 27 character fields. The file needs to be loaded into an Oracle table. But the challenge is that everytime the file comes it may or may not have values in all 27 fields.
Column Definition of the 27 fields:
TYPE: Char (1)
NAME: Char (30)
CUSTOM_VAL: Char... (8 Replies)
Discussion started by: madhunk
8 Replies
2. Shell Programming and Scripting
I have a directory with its subdirectories and files. I want to change them all to read only. Say it is ~/test
chmod -R 444 ~/test
chmod: `/home/myname/test': permission denied
I do not understand. Do I have to have executable mode for a diirectory to access.
How can I change ~/test to... (5 Replies)
Discussion started by: lalelle
5 Replies
3. Tips and Tutorials
Unix keeps 3 timestamps for each file: mtime, ctime, and atime. Most people seem to understand atime (access time), it is when the file was last read. There does seem to be some confusion between mtime and ctime though. ctime is the inode change time while mtime is the file modification time. ... (2 Replies)
Discussion started by: Perderabo
2 Replies
4. Linux
Hello everyone I recently clone a system and doing so it gave my nics cards id's of eth3 and eth4 instead of eth0 and eth1. Is there a config file or something out there where I can change these back? All help will be appreciated. (2 Replies)
Discussion started by: aojmoj
2 Replies
5. Shell Programming and Scripting
Hi All
At the moment the following code works but ideally i do not want to have to change the original $1
tr "\r" "\n" < "$1" > "$1.fix"
printf "\n" >> "$1.fix"
mv "$1.fix" "$1"
FILE=$1
coffee_out="splitmovie"
coffee_fill="-splitAt"
coffee_end="-self-contained -o output.mov $2"... (1 Reply)
Discussion started by: babajuma
1 Replies
6. UNIX for Advanced & Expert Users
hi, in trying to maintain your directories, one needs to do some housekeeping like removing old files. the tool "find" comes in handy. but how would you decide which option to use when it comes to, say, deleting files that are older than 5 days?
mtime - last modified
atime - last accessed... (4 Replies)
Discussion started by: pinoy43v3r
4 Replies
7. UNIX for Dummies Questions & Answers
I need to sort through a volume that contains video files by access time and delete files that have not been accessed over x days. I have to use the access time as video files are originals that do not get modified, just read
Testing commands on a local test folder...
$ date
Wed Sep 28... (10 Replies)
Discussion started by: canon273
10 Replies
8. Programming
I have the following piece of code. Currently the command line arguments are passed as shown below using the "= "sign. I capture the name of the argument, for example vmod and it's corresponding user parameter which is jcdint-z30.cmd.
./raytrac vmod=jcdint-z30.cmd srFile=jcdint.sr
Now I want... (12 Replies)
Discussion started by: kristinu
12 Replies
9. Shell Programming and Scripting
I want to read a constantly changing file and do some operation on text found in that file.
Actually that is log file of linux system and whenever i find a matching string in that file i want to create a text file with timestamp. is it possible to read that file?
here is sample output of log... (7 Replies)
Discussion started by: kashif.live
7 Replies
10. Solaris
It is widely documented that on zfs atime updates the access time on zfs.
Where is the access time updated on Solaris 11.2?
If I create file atimetest.txt under rpool/export/home:
# zfs list rpool/export/home
NAME USED AVAIL REFER MOUNTPOINT
rpool/export/home 13.3G ... (5 Replies)
Discussion started by: jabberwocky
5 Replies
LEARN ABOUT DEBIAN
libssh2_scp_send64
libssh2_scp_send64(3) libssh2 manual libssh2_scp_send64(3)
NAME
libssh2_scp_send64 - Send a file via SCP
SYNOPSIS
#include <libssh2.h>
LIBSSH2_CHANNEL *
libssh2_scp_send64(LIBSSH2_SESSION *session, const char *path, int mode,
libssh2_uint64_t size, time_t mtime, time_t atime);
DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3)
path - Full path and filename of file to transfer to. That is the remote file name.
mode - File access mode to create file with
size - Size of file being transmitted (Must be known ahead of time). Note that this needs to be passed on as variable type lib-
ssh2_uint64_t. This type is 64 bit on modern operating systems and compilers.
mtime - mtime to assign to file being created
atime - atime to assign to file being created (Set this and mtime to zero to instruct remote host to use current time).
Send a file to the remote host via SCP.
RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_SCP_PROTOCOL -
LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block.
AVAILABILITY
This function was added in libssh2 1.2.6 and is meant to replace the former libssh2_scp_send_ex(3) function.
SEE ALSO
libssh2_channel_open_ex(3)
libssh2 1.2.6 17 Apr 2010 libssh2_scp_send64(3)