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File creation timesFile creation timesPosted Jul 29, 2010 9:48 UTC (Thu) by fperrin (guest, #61941)In reply to: File creation times by saffroy Parent article: File creation times
> Any change to file data will require updating mtime, which is metadata, hence ctime will be updated too.
Does this mean that ctime is always more recent than mtime ?
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File creation times Posted Jul 29, 2010 10:01 UTC (Thu) by Mog (subscriber, #29529) [Link]
> Does this mean that ctime is always more recent than mtime ?
Since mtime can be set to any value (using touch for example), not always.
File creation times Posted Jul 29, 2010 17:10 UTC (Thu) by docwhat (subscriber, #40373) [Link] I had to try it for myself...$ mkdir -p /tmp/tmp.e0EkZhvZQR $ touch /tmp/tmp.e0EkZhvZQR/somefile $ stat /tmp/tmp.e0EkZhvZQR/somefile File: `/tmp/tmp.e0EkZhvZQR/somefile' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 801h/2049d Inode: 2760536 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1000/ holtje) Gid: ( 1000/ holtje) Access: 2010-07-29 13:09:14.990815140 -0400 Modify: 2010-07-29 13:09:14.990815140 -0400 Change: 2010-07-29 13:09:14.990815140 -0400 $ touch -m -d 2110-01-01 /tmp/tmp.e0EkZhvZQR/somefile $ stat /tmp/tmp.e0EkZhvZQR/somefile File: `/tmp/tmp.e0EkZhvZQR/somefile' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 801h/2049d Inode: 2760536 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1000/ holtje) Gid: ( 1000/ holtje) Access: 2010-07-29 13:09:14.990815140 -0400 Modify: 2110-01-01 00:00:00.000000000 -0500 Change: 2010-07-29 13:09:14.990815140 -0400Yup!
File creation times Posted Jul 29, 2010 23:45 UTC (Thu) by jzbiciak (✭ supporter ✭, #5246) [Link]
So how come ctime did *not* change? The metadata (ie. mtime) changed. I'm willing to believe that mtime is *not* in the set of metadata that ctime represents.
File creation times Posted Jul 30, 2010 0:13 UTC (Fri) by docwhat (subscriber, #40373) [Link] It happened too fast. I'm using a script. Here it is with a sleep.$ mkdir -p /tmp/tmp.RZFIqs7625 $ touch /tmp/tmp.RZFIqs7625/somefile $ stat /tmp/tmp.RZFIqs7625/somefile File: `/tmp/tmp.RZFIqs7625/somefile' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: ca02h/51714d Inode: 1622396 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1002/ docwhat) Gid: ( 1002/ docwhat) Access: 2010-07-29 19:50:55.000000000 -0400 Modify: 2010-07-29 19:50:55.000000000 -0400 Change: 2010-07-29 19:50:55.000000000 -0400 $ sleep 2 $ touch -m -d 2110-01-01 /tmp/tmp.RZFIqs7625/somefile $ stat /tmp/tmp.RZFIqs7625/somefile File: `/tmp/tmp.RZFIqs7625/somefile' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: ca02h/51714d Inode: 1622396 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1002/ docwhat) Gid: ( 1002/ docwhat) Access: 2010-07-29 19:50:55.000000000 -0400 Modify: 2110-01-01 00:00:00.000000000 -0500 Change: 2010-07-29 19:50:57.000000000 -0400The script I used: #!/bin/bash set -x mkdir -p /tmp/tmp.e0EkZhvZQR touch /tmp/tmp.e0EkZhvZQR/somefile stat /tmp/tmp.e0EkZhvZQR/somefile sleep 2 touch -m -d 2110-01-01 /tmp/tmp.e0EkZhvZQR/somefile stat /tmp/tmp.e0EkZhvZQR/somefileHere's how I ran it: $ /tmp/foo.sh |& perl -p -e 's@^\+@\$@'I just cut-and-pasted the middle of the output. Ciao!
File creation times Posted Jul 30, 2010 13:49 UTC (Fri) by jzbiciak (✭ supporter ✭, #5246) [Link]
Ah, ok. Mystery solved!
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