how to log all the command output to one single file in bash scripting [duplicate]

Question

In gnu/Linux i want to log all the command output to one particular file. Say in terminal,i am typing

echo "Hi this is a dude"

It should print in the file name specified earlier without using the redirection in every command.

Answer 1

$ script x1
Script started, file is x1
$ echo "Hi this is a dude"
Hi this is a dude
$ echo "done"
done
$ exit
exit
Script done, file is x1

Then, the contents of file x1 are:

Script started on Thu Jun 13 14:51:29 2013
$ echo "Hi this is a dude"
Hi this is a dude
$ echo "done"
done
$ exit
exit

Script done on Thu Jun 13 14:51:52 2013

You can easily edit out your own commands and start/end lines using basic shell scripting (grep -v, especially if your Unix prompt has a distinctive substring pattern)