Every Linux file is associated with timestamps, which specifies the last access time, last modification time and last change time.
To get the timestamp of a file "ls -l" and "stat".
1. Use -c option to avoid creating new files, but will change the timestamp by present time.
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-10-18 23:42:12.000000000 -0700
Modify: 2012-10-18 23:42:12.000000000 -0700
Change: 2013-09-11 08:49:16.509859887 -0700
touch -c tgs.txt
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-09-11 08:49:25.685239864 -0700
Modify: 2013-09-11 08:49:25.685239864 -0700
Change: 2013-09-11 08:49:25.685239864 -0700
2. Change File’s Access Time using -a.
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-09-11 08:10:44.783796541 -0700
Modify: 2013-09-11 08:10:44.783796541 -0700
Change: 2013-09-11 08:10:44.783796541 -0700
touch -a tgs.txt
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-09-11 08:13:14.824798981 -0700
Modify: 2013-09-11 08:10:44.783796541 -0700
Change: 2013-09-11 08:13:14.824798981 -0700
3. Change File’s Modification Time using -m.
touch -m *.o
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-09-11 08:13:14.824798981 -0700
Modify: 2013-09-11 08:10:44.783796541 -0700
Change: 2013-09-11 08:13:14.824798981 -0700
touch -m tgs.txt
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-09-11 08:13:14.824798981 -0700
Modify: 2013-09-11 08:16:36.600236392 -0700
Change: 2013-09-11 08:16:36.600236392 -0700
4. Modification time using -t and -d.
touch -t [CCYYMMDDHHMM.SS] filename
touch -t 201212312359.59 tgs.txt
touch -a -m -t 201212312359.59 tgs.txt
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-12-31 23:59:59.000000000 -0800
Modify: 2012-12-31 23:59:59.000000000 -0800
Change: 2013-09-11 08:30:24.706252619 -0700
touch -d "2012-10-19 12:12:12.000000000 +0530" tgs.txt
stat tgs.txt
File: `tgs.txt'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 802h/2050d Inode: 525402 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-10-18 23:42:12.000000000 -0700
Modify: 2012-10-18 23:42:12.000000000 -0700
Change: 2013-09-11 08:37:51.182799786 -0700
5. Copy the Time-stamp from Another File using -r.
ls -l
-rw-r--r--. 1 root root 0 Sep 11 08:43 test.txt
-rw-r--r--. 1 root root 0 Oct 19 2012 tgs.txt
touch test.txt -r tgs.txt
ls -l
-rw-r--r--. 1 root root 0 Oct 19 2012 test.txt
-rw-r--r--. 1 root root 0 Oct 19 2012 tgs.txt
ref: http://www.thegeekstuff.com/2012/11/linux-touch-command/
No comments:
Post a Comment