le filename Function
Returns true if filename is not the empty string, is a file and is readable.
mbfl_file_is_writable filename Function
Returns true if filename is not the empty string, is a file and is writable.
mbfl_file_is_directory directory F... directory Function
Returns true if directory is not the empty string, is a directory and is readable.
mbfl_file_directory_is_writable directory Function
Returns true if directory is not the empty string, is a directory and is writable.
mbfl_file_is_symlink pathname Func
tion of this comparison operator.
----
-z
string is null, that is, has zero length
<code>
String='' # Zero-length... if [ -z "$String" ]
then
echo "\$String is null."
else
echo "\$String is NOT null."
fi # $String is null.
</code>
----
-n
string is not null.
Caution
The -n test
