Test

!= 	not equal
= 	equal
-eq	equal
-gt 	greater than
-ge	greater than or equal
-lt	less than
-le	less than or equal
!	logical negotiation
-a	logical and
-o	logical or
-r file	true if hte file exists and is readable
-w file	true if the file exs and is writable
-x file  ..........................executable
-s file	......................size >0
-d file	true if .... directory
-f file true if..... file
-z 	true if the lenght of the str is zero




 example of test

#test to see if only one argument is passed to the shell script
if test $#   !=1
then
	echo "You must supply one argument"; exit
fi




#test for two or more arguments
if test $# -lt 2
then
	echo "You must supply two or more arguments"; exit
fi




#test to see if the argument is a file or directory
if test $# !=1
then 
	echo "you must supply one argument"; exit
fi
if test -d $1
then
	echo "$1 is a directory"
else
if test	-f $1
then 
	echo "$1 is a directory"
else
	echo "$1 does not exist"
fi