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UGU: Unix Guru Universe - Unix Tip #4019- February 12, 2012
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Unix Tip #4019- February 12, 2012
WHY MV IS SLOW
mv command across filesystems
is slower on large files
WHY?
mv would be slow if you are
moving files across filesystem.
The inode number changes only
when a file is moved across
file system.
A new inode number means a new
file is physically created on
disk.
It remains unchanged, if it
is within the same filesystem.
One can verify by using
ls -il command on that file.
mv uses rename() system call.
if it fails, it uses copy routine
(basicailly reads from a file and
writes in another file).
mv command across filesystem is
more of a copy then mv.
This tip generously supported by: dkotian1@rediffmail.com
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
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production.
LAST 5 TIPS
4018
- ECHO LINES TO A BLANK
4017
- STAT FILES
4016
- AWK THE STATS
4015
- FTP AUTOMATED TRANSFERS
4014
- AUTOMATIC LOGIN TO REMOTE HOSTS
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