Want to know if exist a function that controls if a folder in unix system is empty or not.

What means "control"? - perhaps " a way to test if a directory is empty"?

Yes, I have to check if the directory is empty.
 

I'm assuming you want a script function. This works with ksh:

listfiles() { ls -1 ${1:+"$@"} 2>/dev/null; }

is_dir_empty()
{ test ! -d $1 -o -z "$(listfiles -A $1)";}

# here's how if can be used: execute the chmod command only if there's something in the directory:

dirobj="/tmp/mydir"
is_dir_empty $dirobj && echo $dirobj is empty || chmod 666 $dirobj

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