cache of commands, du -sh, find, grep

[sathiya]

Hi,

Am pretty sure that most of the commands in Linux does caching of information.

where it does the caching, is it will be human understandable ??

Any persuasion is appreciated.

[daark.child]

The history of commands you have run is located in ~/.bash_history. This maybe different if you are not using the bash shell.

[sathiya]

sorry, if am not clear already

actually my question is not about history, it is about cache.

History
Which you are speaking about the commands which i have executed already can be again got by using the navigation keys.

Cache
Which i am telling is, the result of the command is cached, and it is given while executing the next time.
Example:
when you execute du -sh ~, it takes 3 minutes and tells that your home directory is 4.3 GB at first time, and from then onwards for some time it will tell 4.3 with in some 1 or 2 seconds, in the next executions ???? how it is ???

And for how much time the cache will be used ?? this is my question?? GOT IT ???