Getting Information about file

File Checking
Existence:

if( -e $file) { print "File exists \n";}
else { print "File doesn't exist\n"; }

File exists with size 0(zero) : -z
File exists with size non-zero : -s

Readable/writable/Executable

File Readable : -rFile Writable : -w
File Executable : -x

Text/Binary

Text : -T
Binary : -B