try "apropos " apropos(1) apropos(1) NAME apropos - search the whatis database for strings SYNOPSIS apropos keyword ... DESCRIPTION apropos searches a set of database files containing short descriptions of system commands for keywords and displays the result on the standard output. SEE ALSO whatis(1), man(1).
play with linux , play with different shells, play with various tools(awk,perl,sed,lex,yacc,gnuplot,vi,make ,gdb,gcc,RCS,gprof,expect,Tcl/Tk,...) BTW, u should learn emacs first. I began to love UNIX after I mastered 30% of emacs. Then, you could begin to learn UNIX system programming and hack around its kernel....(I am on the way too) The strongest recommended Book: Kernighan & Pike <> If you are truly interested, you can visit the website to hear the suggestion