ctime --In UNIX, it is not possible to tell the actual creation time of a file. The ctime--change time--is the time when changes were made to the file or directory's inode owner, permissions, etc.. The ctime is also updated when the contents of a file change. It is needed by the dump command to determine if the file needs to be backed up. mtime is one of the three timestamps in Unix that are maintained for each file in most of the filesystems. Purpose of mtime. The real purpose of the mtime timestamp is to track the last time.
atime, ctime and mtime in Linux. As you know, Unix filesystems store a number of timestamps for each file. This means that you can use these timestamps to find out when any file or directory was last accessed read from or written to, changed file access permissions were. If you remember, all files and directories in Unix filesystems have three timestamps associated with them – atime, ctime and mtime. Since questions about modifying access time atime and modification time mtime are quite frequent in my website logs, I thought I'd explain how it is done. atime • the last time the file was read, view or displayed. Probably by executing command more, cat, less. mtime • the last time the file content was modified. Probably by executing command vi. ctime • the last time the file meta data was changed. Probably by executing command chmod, chown. I just created a text-file yyy in my home-directory. I modified it both with touch yyy and edited it manually. Then I wanted to find this file and others via: find ~/ -type f -mtime 1 -ctime 1. So, I understand the difference between the three ideas in the title. atime -- access time = last time file opened mtime -- modified time = last time file contents was modified ctime -- changed ti.
The file ctime and atime are OS dependent. For Linux, ctime is set by Linux to the current timestamp when the inode or file is changed. Here's an example, on Linux, of implicitly changing ctime by setting atime and mtime to their original values. If you are dealing with files, you might wonder what the difference is between `mtime`, `ctime` and `atime`. This is how you easily differentiate them. I know that find -ctime 1 will find ALL files that have been modified that are greater than 1 day old and -ctime 1 will find files that are ONLY 1 da. Can any one tell me how to find out ctime, mtime,atime for a file/directory on unix. Cheers, Nilesh 5 Replies Discussion started by: nilesrex.
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. "Change" and "modification" are pretty much synonymous. You can't assume that ctime happened before mtime, but normally ctime is the same as, or after, mtime. ctime on unix is not "create time", but "change time". mtime is updated when a file's contents are changed, but ctime is updated when file metadata is changed which means it's updated when mtime is updated too, so it's perfectly normal for. What are atime, ctime and mtime? Files, directories, fifos, sockets and device files later on refered as files has three different time values. Normally no-one is interested of these time values, but when something strange happens people tend look up when something happened and then you need to understand what are these times. -mtimen The primary shall evaluate as true if the file modification time subtracted from the initialization time, divided by 86400 with any remainder discarded, is n. Interestingly, the description of find does not further specify 'initialization time'. It is probably, though, the time when find is initialized run.
How to find ctime, mtime, etc. of files I have a script to go clean up some files based on their name and ctime. A simple thing, really, except that it fails to find some files that I know it should. ctime - the last time the file's inode was changed e.g. permissions changed, file renamed, etc. mtime - last time the file's CONTENTS were changed atime - last time the file was accessed. The numbers are simply unix timestamps - signed 32bit ints representing seconds since Jan 1/1970, aka the epoch. And yes, smaller numbers = earlier in time.
What time is it ? atime ctime mtime In the unix world and with the unix find command, you will need to know how to search for files that are suspect of being access/readed, modify or created. Knowing the difference of the three time options with the unix find command, can come in handy. The asctime and ctime functions, and other time functions can use a common, statically allocated buffer to hold the return string. Each call to one of these functions might destroy the. Convert Unix timestamp to Readable Date/time based on seconds since standard epoch of 1/1/1970 UNIX TimeStamp.
mtime - File Modify Time. Last modification time shows time of the last change to file's contents. It does not change with owner or permission changes, and is therefore used for tracking the actual changes to data of the file itself. Find atime, ctime and mtime with ls. The simplest way to confirm the times associated with a file is to use ls. Mtime may refer to: st_mtime, a file's last modification time, part of the stat in Unix;, Chinese film website; This disambiguation page lists articles associated with the title Mtime. If an internal link led you here, you may wish to change the link to point directly to the. The events are usually described as "modification" the data in the file was modified, "access" some part of the file was read, and "metadata change" the file's permissions or ownership were modified, although the acronym is derived from the "mtime", "atime", and "ctime" structures maintained by Unix.
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