linux command?

Question

what this command do :

grep, egrep, fgrep, export, find a file in history?


history | grep cat
and how can we find something in our history file?
or how we can display all files which ends with *.html in our current directory or history file.
waht does export command exactly do and grep and egrep and fgrep?
thanks,

Answer 1

Type "man grep" at the command prompt to get all the info you need.

Your history file is in your home dir. Mine is called ".bash_history" because i'm using a bash shell.

(ls -lA displays all contents of your current dir.)