how to replace characters or remove them in golfscript efficiently

Question

If I have a character list already, how can I remove certain character, or replace all occurrences of such character with another character?

Answer 1

# remove any 'l'
'hello world' 'l'-
puts

# replace all 'l' with 'X'
'hello world' 'l'/ 'X'* 
puts

Please also have a look into the page for GolfScript built-ins.