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PsL Monthly 1994 February
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HPFSTIME.TXT
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1993-12-10
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HPFSTIME Copyright 1993 by Ira J. Minor. All rights reserved.
Table of Contents
1) Introduction
2) Command Syntax
3) Examples
4) Technical discussion
1) Introduction
HPFSTIME is SHAREWARE written and supported by:
Ira J. Minor
13024 S.W. 90 Court
Miami, FL 33176
Phone (305) 251-1875
If you find this program useful, as I know you will, please
send a registration fee of $10 along with your comments,
criticism and suggestions. I am working on additional
enhancements as well as other useful OS/2 utilities and tools.
Thank you.
Have you ever wondered what's going on when your hard disk
light keeps flashing on and off. Well, wonder no more.
HPFSTIME generates a list of files, for a given disk partition
(drive), that meet the specified HPFS date/time stamp
selection criteria. The HPFS file system maintains three sets
of date and time stamps for each file on an HPFS formatted
partition. They are as follows.
a) the date and time the file was Created.
b) the date and time the file was Last Accessed.
c) the date and time the file was Last Written.
For a detailed explanation of when these date/time stamps
are updated, see the technical discussion section of this
document.
2) Command Syntax:
HPFSTIME drive{:}{\}{path} {selection option}
Selection options:
N files that have Never been accessed since creation.
R files that have been Read but never written since creation.
T Total files, irrespective of date and time stamps.
Cdate files Created since "date".
Cminutes files created in the last "minutes".
W files Written since creation.
Wdate files Written since "date".
Wminutes files Written in the last "minutes".
A files Accessed since creation.
Adate files Accessed since "data".
Aminutes files Accessed in the last "minutes".
Notes:
1) If only a drive letter is entered, with no path,
the search starts with the root directory and all
subdirectories on the drive are searched.
2) If a drive letter and path are entered, the search starts
at the given path and all subdirectories from that path
are searched.
3) If no selection option is entered, the default selection
option is Atodays-date and generates a list of all files
Accessed today.
4) Dates MUST be EXACTLY six characters of the form YYMMDD.
5) Minutes is the number of minutes prior to now. Todays
date is assumed.
6) All files, including hidden, system, read only and archived
are searched.
Output:
If sorted output is desired, see examples below, the
following columns should be used:
Sort by Column
Created 1
Last Access 16
Last Written 31
File Name 49
3) Examples:
HPFSTIME D: list all files on the D drive that were
accessed today (default).
HPFSTIME D:\LOTUS list all files, on the D drive beginning
with the Lotus directory, that were
accessed today (default).
HPFSTIME D: W930601 list all files, on the D drive, that were
Written since June 1, 1993.
HPFSTIME D: A90 list all files, on the D drive, that were
Accessed in the last 90 minutes.
Examples using various command line capabilities:
HPFSTIME D: > PRN Redirect output to the default printer.
HPFSTIME D: | MORE Pause output to the screen after each
screen full.
HPFSTIME D: | SORT /+16 Sort output by Last Access time stamp.
HPFSTIME D: | SORT /+31 > PRN Sort output by Last Written time stamp
and redirect output to the printer.
4) Technical Discussion:
Have you ever wondered what OS/2 is doing when your hard disk
light is flashing on and off for what seems to be unbelievably
long periods of time? Well, wonder no more. OS/2, when accessing
an HPFS formatted partition, time stamps every file when it is
Created, Accessed or Written. The files include programs, DLLs,
data, etc. By running the HPFSTIME program you can create a
listing of a subset of the files that are of interest to you.
Some of the ways I have used HPFSTIME are as follows:
1) Run immediately after booting OS/2 to see what files get
loaded at boot time. If D: is the boot drive, run HPFSTIME D:.
If you are interested in the order of program load, run
HPFSTIME D: | SORT /+16. Remember that there are some files
that get loaded prior to the HPFS file system being initialized
and CONFIG.SYS loaded. These files will not show up. I have done
additional experimentation to determine what these files are
and the order that they get loaded.
2) Run immediately after booting OS2 to see what files get Written
at boot time. HPFSTIME C: W10 will display all files on the C:
drive that where Written in the lat 10 minutes.
3) Shut down the system, boot OS/2 from the install diskettes,
run HPFSTIME to see what files get written at shutdown.
Rather than boot from the install diskettes I have set up
a four meg partition on my hard disk that boots a mini OS/2
system that will run a single text mode OS/2 program such as
CHKDSK, FORMAT, HPFSTIME, or the C Set++ compiler. It
requires about three megs of files which I copy from my big
OS/2 system. By using HPFSTIME I was able to determine which
files I needed to copy and in what order. By copying the files
in the order that they will be loaded I minimize arm movement
so the boot of the mini system goes very fast. Of course I use
BootManager to give me the option of booting my big or mini
OS/2 systems.
4) I do a lot of C Set++ compiles. By running HPFSTIME against
my compiler and toolkit directories I was able to see exactly
what files were accessed. I created a VDISK and a CMD file
that copies the files from the hard disk to the VDISK. I also
had to modify CONFIG.SYS so the compiler will look for what it
needs in the VDISK first. My compiles go much faster now. I
also discovered that it was using the link editor that comes
with OS/2 rather than the one that comes with the compiler.
In general, if you have multiple files with the same name, in
different directories, you can see which one was actually
accessed.
Discussion of when HPFS date/time stamps are updated.
The HPFS file system maintains three sets of date
and time stamps for each file on an HPFS formatted
partition. They are as follows:
1) The date and time the file was Created.
2) The date and time the file was Last Accessed.
3) The date and time the file was Last Written.
The Created time stamp is the date and time the file
was originally placed on your hard disk. When a disk
partition is formatted there a