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Full Discussion: Conditional execution
Top Forums Shell Programming and Scripting Conditional execution Post 302853169 by edstevens on Friday 13th of September 2013 10:35:59 AM
Old 09-13-2013
Conditional execution
Here's an interesting (to me, anyway) little puzzle.

Background:
I have a process that restores a number of large(ish) files from tape backup. As an individual file is being written, it is owned by root, then the ownership is changed when that file is complete. Since this process can take some time (and operations, who actually runs it) isn't timely about starting it when requested or telling me when it completes, I wrote a little script to watch for the presence of the root-owned files:

Code:
echo "Please enter sleep interval: "
read sleep_interval
while :
do
ls -ltr /mydir |grep root
date
echo Sleeping $sleep_interval seconds
sleep $sleep_interval
done

So when I first kick it off, I set the sleep interval to something large, like 300. Then when I see files who are owned by root showing up, I cancel the script and resubmit with a sleep interval of 10.

So it occurs to me, could I code it to self-determine what the sleep interval should be. Check the outcome of the 'ls', and if nothing is owned by root sleep for 300, else sleep for 10. So, on first starting, there would be no files, so it would sleep for 300. On the first iteration that turns up a file, sleep goes to 10, and on first following iteration with no files owned by root, sleep goes back to 300.

In pseudo code, something like this:

Code:
while :
do
ls -ltr /mydir |grep root|grep -v "lost+found"
#- begin pseudo code
if nothing found
   sleep 300
else
   sleep 10
fi
# - end pseudo code
done

 

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LEARN ABOUT OSF1

puzzle

puzzle(1X)																puzzle(1X)

NAME

       puzzle - 15-puzzle game for X

SYNOPSIS

       puzzle [-option...]

OPTIONS

       This  option  specifies	the display to use; see X(1X).	This option specifies the size and position of the puzzle window; see X(1X).  This
       option specifies the size of the puzzle in squares.  This option specifies the speed in tiles per second for  moving  tiles  around.   This
       option  specifies  an  image  file  containing  the picture to use on the tiles.  Try "mandrill.cm."  This only works on 8-bit pseudo-color
       screens.  This option indicates that the program should create its own colormap for the picture option.

DESCRIPTION

       Executing puzzle with no arguments plays a 4x4 15-puzzle.  The control bar has two boxes in it.	Clicking in the  left  box  scrambles  the
       puzzle.	 Clicking  in the right box solves the puzzle.	Clicking the middle button anywhere else in the control bar causes puzzle to exit.
       Clicking in the tiled region moves the empty spot to that location if the region you click in is in the same row or  column  as	the  empty
       slot.

BUGS

       The picture option should work on a wider variety of screens.

COPYRIGHT

       Copyright 1988, Don Bennett.

SEE ALSO

       X(1X)

AUTHOR

       Don Bennett, HP Labs

																	puzzle(1X)
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