Shell Programming and Scripting

Hello,

I am trying to write a unix cmd , that if files in folder /path/FTP are all zero kb or empty then good to go, if not empty then sleep for 8 hrs.

Following cmd list me the files which are not empty, But when I am incorporating IF ELSE cmd fails

Code:

find /path/FTP. -type f -exec wc -l {} \; | awk '$1 >0 {print $2}'

Any help will be appreciated.
Thanks

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I'm a bit unsure - how do you want to incorporate IF ELSE in a find command? Did you consider the -size test? You can have two (or more) branches in the find parameters. Read man find.

And, why and how do you differentiate between zero kB and empty?

Please be way more precise with your specification.

Find itself can test for non-empty files, in an if test this could look like:

Code:

if [ -n "`find /path/FTP. -type f -size +0`" ]; then sleep 28800; fi

Also, you can stop at the first file; use 'read' or 'line' to detect the first line. Be careful of read, as "| read x' in ksh is fine, but in bash, read runs in an implicit subshell and x is not set for your shell, so try explicit subshell in which you test x: '|( read x ; . . . .)'. While 'line' is not a built-in (if you have it at all), it is good at expediting data out of a pipe, where one byte reads are given special treatment, do not block awaiting a bull buffer, and it returns 1 to $? on EOF.

Maybe wait and repeat?

Code:

until find /path/FTP. -type f -size 0 | awk '{print; exit 1}'
do
  sleep 28800
done

Instead of until or while you can also use an if clause. It gets the exit status of the awk command, 0 normally, 1 if a zero-file was found.
NB in the shell an exit status 0 is a true condition (for practical reasons).
You can suppress awk's output with >/dev/null, this doesn't affect its exit status.

---------- Post updated at 02:57 PM ---------- Previous update was at 02:49 PM ----------

Just seeing the proposal with line.

Code:

while find /path/FTP. -type f -size 0 | line
do
 sleep 28800
done

Thank You everyone, My problem is solved , If cmd worked for me.

I think in find the size must be '+0' for > 0, else you find empty files.