06-04-2009
Processing very big directory
Hello,
I have a very big directory with lots of small files. Just doing a single "ls" takes eternity, so I even can't know how many files the directory has.
I need to get the newest files in the last 15 minutes, but I can't get an eficient way of doing it. I've tried find, perl, shell script, etc. Is there any more eficient way of doing this? Maybe avoiding reading all the files, or going to the end of the directory...
PS: Using HP-UX B.11.31 U ia64
Any help?
Thanks.
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lndir(1X) lndir(1X)
NAME
lndir - create a shadow directory of symbolic links to another directory tree
SYNOPSIS
lndir fromdir [todir]
DESCRIPTION
lndir makes a shadow copy todir of a directory tree fromdir, except that the shadow is not populated with real files but instead with sym-
bolic links pointing at the real files in the fromdir directory tree. This is usually useful for maintaining source code for different
machine architectures. You create a shadow directory containing links to the real source which you will have usually NFS mounted from a
machine of a different architecture, and then recompile it. The object files will be in the shadow directory, while the source files in
the shadow directory are just symlinks to the real files.
This has the advantage that if you update the source, you need not propagate the change to the other architectures by hand, since all
source in shadow directories are symlinks to the real thing: just cd to the shadow directory and recompile.
The todir argument is optional and defaults to the current directory. The fromdir argument may be relative (e.g., ../src) and is relative
to todir (not the current directory).
Note that RCS, SCCS, and CVS.adm directories are not shadowed.
Note also that if you add files, you must run lndir again. Deleting files is difficult because the symlinks will point to places that no
longer exist.
BUGS
The patch routine needs to be able to change the files. You should never run patch from a shadow directory.
Use a command like the following to clear out all files before you can relink (if the fromdir has been moved, for instance):
find todir -type l -print | xargs rm
The following command will find all files that are not directories:
find . ! -type d -print
lndir(1X)