running commands sequentially in background with exec($commands_in_background)

[Dasdan <dasdan20@xxxxxxxxxxx>]

I want to execute a couple of linux commands from a php script 
'sequentially in background'.

I want to run them in background so the php script doesn't hang while 
the linux commands are running.

example:


first i create a lock file with php
   $lockfile_path :  /home/web/...blablabla.../test.tar.bz2_Lock.txt

the I execute the following command from my php script:

   exec("du -a ~/ 2>&1 > /home/web/...blablabla.../backupFSlog.txt ;
   sleep 10 >/dev/null 1>/dev/null 2>/dev/null ; rm -f $lockfile_path
   >/dev/null 1>/dev/null 2>/dev/null &);

problem:
the php script hangs for 10 seconds (sleep), what is not what I want

I've read a lot of sugestions but I can't get it to work.

When I execute the commands one by one, it works in background, but 
when I want to run them 'sequentially in background', the php script 
hangs

They need to run sequentially because the $lockfile_path may only be 
deleted when all the other commands are executed

Some advice please?

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http://www.dasdan.be

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