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Some Ruby lesser used functions

Tidying up (as one does after the recent server move!), I came across a list of functions in Ruby which are important at times, but not exactly top of the list ... and I thought I would share them here - with a few words on each - in the hope that I might save someone a lot of hairpulling at some stage in the future!

abort - teminate your program
at_exit - register code to be run when you exit
autoload - register a class to be loaded only when used
caller - return the current execution stack
eval - evalute the given string as ruby code
exec - exit and run the given command in its place
fork - create a child process (could be a whole module on this!)
sub and gsub - perform string substitution (see under regular expressions)
lambda, proc - convert a block into a proc object
readline - same as gets but throws exception at eof
select - checks for availabilty of inputs without blocking
sleep - suspend operation for n seconds
srand - seed the random number generator
syscall, system - run system calls and commands
trap - set a signal handler (e.g. if you need to catch ^C)
(written 2008-07-26)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R119 - Ruby Miscellany
  [3799] Ruby Documentation through rdoc - (2012-07-07)
  [3783] Load path, load and require in Ruby, and a change from 1.8 to 1.9 - (2012-06-24)
  [3622] Loading Ruby classes - where does Ruby look? - (2012-02-24)
  [3428] How many days to Christmas? - (2011-09-09)
  [3155] Rake - a build system using code written in Ruby - (2011-02-03)
  [1890] MySQL database from Ruby - an example - (2008-11-16)
  [1889] Ruby mixins, modules, require and include - (2008-11-16)
  [1586] Variable types in Ruby - (2008-03-21)
  [1181] Good Programming practise - where to initialise variables - (2007-05-09)


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