cmp functions for string

[huiyiqun]

Currently, we could compare string as float with some builtins such as >, < and ==.

However, how could we compare string as string?

[xiaq]

We will change == to work only on numbers and use eq for strings.

[xiaq]

I planned to adopt the names Perl use for string comparisons, i.e. lt le eq ne gt ge. However, according to Debian, only eq has not been taken:

~$ le
The program 'le' is currently not installed.  To run 'le' please ask your administrator to install the package 'le'
le: command not found
~$ lt
The program 'lt' is currently not installed.  To run 'lt' please ask your administrator to install the package 'looptools'
lt: command not found
~$ eq
eq: command not found
~$ ne
The program 'ne' is currently not installed.  To run 'ne' please ask your administrator to install the package 'ne'
ne: command not found
~$ ge
The program 'ge' is currently not installed.  To run 'ge' please ask your administrator to install the package 'pvm-examples'
ge: command not found
~$ gt
The program 'gt' is currently not installed.  To run 'gt' please ask your administrator to install the package 'genometools'
gt: command not found

[xiaq]

String comparison functions have been named <s <=s ==s !=s >s >=s, until we find a better way to name them.