issparse checks for partly populated files (sparsefiles) and prints their name
getaddrbyifname local inet addr (ip address) lookup by interfacename
lin-o-disk () is approach to fill some full booting floppydisk with as much unixlike functionality as possible.
libhide is usefull for hiding system and user information from blithering networkprograms like (apache, netscape) without patching them. Now with defined random values on each call. Is an example for shared library preload in Linux.
crypt generates crypted passwords a la /etc/passwd or for apache .htaccess/password-files.
firstpass generates a pronounceable password and it's crypt string. This is usefull when you have many users to set up and don't wanne give them all the same starting password.
netscaperc works like "netscape -remote" for X11, but has a faster startup and starts netscape when it's not already on display.
Perl-Hacks
mailto is a cgi-formmailer that checks for syntactical correct emailaddress, attaches ip of sender and works only from allowed referers.
whois is an whois-client that automatically chooses the right whois-server for several toplevel-domains (uk,mil,gov,us,tm,as,af,bt,mx,ca,dk,de,be,at,cz,fr,ch,st,au).
Shell-Hacks
ps is a small /bin/sh skript, that looks into /proc and shows all processes like /bin/ps -ax.