![]() ![]() We can also notice that stat command is highly exact in showing the seconds in a timestamp. The displayed date and time are converted from UTC to the local time zone when displayed to the user. The number +004 at the right of each timestamp is known as time zone offset, which indicates that the time zone is +004 hours ahead of UTC. In this image, the initial timestamps, which show the time that the file was created, are shown. The image below shows an example of using the stat command to view the 3 timestamps. Initially, the timestamps all show the time in which the file was created. We can also use the touch command or any text editor. The file was created at 14:04 on using the nano command. To further explain the concept, we will examine a file named test.txt, the following changes were made to the file: Creating the File ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.Python Backend Development with Django(Live) The touch command offers an option to change the modification time.In Linux, sometimes we use the short form mtime to indicate the last modification/change time of a file. The access time (or atime in short) timestamp is the last time a file was read. As the name implies, the timestamps are used to find out when a file was accessed, modified and changed. Android App Development with Kotlin(Live) Getting the Last Modification Time of a Directory. In Linux and Unix in general, every file has three types of timestamps namely atime (access time), mtime (modification time) and ctime (change time).Full Stack Development with React & Node JS(Live).Java Programming - Beginner to Advanced.Data Structure & Algorithm-Self Paced(C++/JAVA).Data Structures & Algorithms in JavaScript.Data Structure & Algorithm Classes (Live).It shows us the last time the file status was changed due to modifications such as changing the file permissions. While the ctime field sounds similar to crtime, it does not tell us the file creation date. We can see that we created the file on “Fri Dec 17 06:17:09 2021”. Here, the creation time is in the crtime field mentioned earlier. ![]() Linux chattr command can also change the ctime. assume the file is -rwxr-xr-x (755) then Code: chmod 755 filename you have to own the file to do this will set ctime to now. Mtime: 0圆1bc31c8:19fee850 - Fri Dec 17 06:44:24 2021Ĭrtime: 0圆1bc2b65:71f8e150 - Fri Dec 17 06:17:09 2021 The file creation date (ctime) is not really the creation date in unix, it is the last time the inode data and some other metadata was modified. The syntax is debugfs -R ‘stat ’ /dev/sdX where inode is our file inode, and /dev/sdX is the filesystem of the file: $ sudo debugfs -R 'stat ' /dev/sda2 There are some arguments to decide which timestamp to change (e.g. Now, we can pass this information to the debugfs command. A utility to change the timestamps would be touch. For this, we can use the –format flag with %w as its value:įilesystem 1K-blocks Used Available Use% Mounted on The programmatic way to set the access and modification timestamps of a file is using one of the following system calls: utime, utimes, futimes, futimens (simple internet search will give you the man page of them) i. It was inherited into the first version of POSIX.1 and the Single Unix Specification. ls is part of the X/Open Portability Guide since issue 2 of 1987. We can also instruct stat only to give us the required data, which is the file creation date in our case. An ls utility appeared in the first version of AT&T UNIX, the name inherited from a similar command in Multics also named ls, short for the word 'list'. Size: 15 Blocks: 8 IO Block: 4096 regular file Now, let’s modify the file and check that only the “Modify” field changes, as it indicates the last modification time: $ echo "Modified" > file ![]() Size: 6 Blocks: 8 IO Block: 4096 regular fileĪccess: (0644/-rw-r-r-) Uid: ( 1000/baeldung) Gid: ( 1000/baeldung)Īs we can see, the creation date is shown in the “Birth” field. An ls utility appeared in the first version of AT&T UNIX, the name inherited from a similar command in Multics also named ls, short for the word 'list'. ![]() Let’s create a file and check its creation time: $ date echo "Hello" > file The easiest way to get the file creation date is with the stat command. ![]()
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