topic Re: simple test in a script in Operating System - HP-UX

simple test in a script

Terrence — Wed, 09 Mar 2005 10:06:28 GMT

I have a portion of a script that needs a test statement to validate that a file has something in it and is not empty. I compare a file to an earlier version of itself to make sure it's no longer growing. However if the file is at zero to start and stays that way for too long the script will assume it's no longer growing and will continue. I want the script to loop back to the compare if it finds the file is empty. I know this is easy but I barely know how to script.

until cmp -s $SOURCE /var/STOCK_ARCHIVE/$SOURCE

do
cp -p $SOURCE /var/STOCK_ARCHIVE/
sleep 300
done

Re: simple test in a script

Patrick Wallek — Wed, 09 Mar 2005 10:09:36 GMT

To test for file existance and non-zero size do:

if [ -s /dir/filename ] ; then
do something
else
doe something else
fi

'man test' for more information and other options.

Re: simple test in a script

Gary L. Paveza, Jr. — Wed, 09 Mar 2005 10:10:44 GMT

Use the -s test

if [ -s /var/STOCK_ARCHIVE/${SOURCE} ]
then
file is not empty
else
file is empty
fi

Re: simple test in a script

Terrence — Wed, 09 Mar 2005 10:18:16 GMT

But how do i put this test after my until, do done so that if the file is empty, it goes back to the until do done?

I need to loop it back.

Re: simple test in a script

Robert Bennett_3 — Wed, 09 Mar 2005 10:21:16 GMT

Here's some little ditty for your notes on test conditions.

The test condition or [condition] - (K) = Korn shell specific
Testing Files
-a file file exists (K)
-b file file exists and is a block special file.
-c file file exists and is a character special file
-d file file exists and is a directory
-e file true if the file exists
-f file file exists and is a regular file
-G file file exists and its group is the effective group ID. (K)
-g file file exists and its set-group-id bit is set
-k file file exists and its sticky bit is set.
-L file file exists and is a symbolic link (K)
-O file file exists and its owner is the effective user ID (K)
-o c Option c is on (K)
-p file file exists and is a named pipe (fifo)
-r file file exists and is readable
-S file file exists and is a socket (K)
-s file file exists and has a size grreater than zero
-t [n] The open file descriptor n is associated with a terminal device; default n is 1
-u file file exists and its set-user-id bit is set
-w file file exists and is writable
-x file file exists and is executable
f1 -ef f2 files f1 and f2 are linked (refer to same file) (K)
f1 -nt f2 file f1 is newer than f2 (K)
f1 -ot f2 file f1 is older than f2 (K)

Re: simple test in a script

Steve Steel — Wed, 09 Mar 2005 10:30:02 GMT

Hi

www.shelldorado.com will help

Also put a while loop round your loop

while [ ! -s "/tmp/toto" ]
do
ll -d /tmp/toto
echo lala
sleep 30
done

As long as /tmp/toto is zero length loop continues

Steve Steel

Re: simple test in a script

Robert Bennett_3 — Wed, 09 Mar 2005 10:44:25 GMT

Thanks Steve - shelldorado.com just went into my favorites....nice site.

B