How to do it...

Start recording the terminal session with the following command:

$ script -t 2> timing.log -a output.session

A full example looks like this:

$ script -t 2> timing.log -a output.session

# This is a demonstration of tclsh
$ tclsh
% puts [expr 2 + 2]
4
% exit
$ exit

Note that this recipe will not work with shells that do not support redirecting only stderr to a file, such as the csh shell.

The script command accepts a filename as an argument. This file will hold the keystrokes and the command results. When you use the -t option, the script command sends timing data to stdout. The timing data can be redirected to a file (timing.log), which records the timing info for each keystroke and output. The previous example used 2> to redirect stderr to timing.log.

Using the two files, timing.log and output.session, we can replay the sequence of command execution as follows:

$ scriptreplay timing.log output.session
# Plays the sequence of commands and output