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Replay The Recorded Terminal Sessions Using Scriptreplay Command On Linux

How To Replay The Recorded Terminal Sessions Using Scriptreplay Command

By sk
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A while ago, we have learned how to record everything you do in Terminal using Script command on Linux. Using Script command, we can record the Terminal sessions in a typescript file and view them later using Cat command or any other text viewing applications. Today, we are going to see how replay the recorded Terminal sessions using Scriptreplay command on Linux.

The Scriptreplay is used to replay a typescript created by the "Script" command to the standard output. It is part of the util-linux package on RPM-based systems and bsdutils package on DEB-based systems and it comes pre-installed on most modern Linux operating systems. So, we don't need to install it.

Replay Recorded Terminal Sessions Using Scriptreplay

As you may already know, the cat command will only the display typescript, but won't play them. If you want to replay the Terminal activity instead of just viewing it, use "scriptreplay" command.

To replay the terminal activities using scriptreplay, you must first record it using "script" command with timing information in a file using -t parameter like below.

$ script -a my_terminal_activities -t=time.log

Or,

$ script -a my_terminal_activities --timing=time.log

Here,

  • terminal.log is the the file that contains timing output of the typescript. You can use any name of your choice, for example time.txt, timing.log etc.
  • my_terminal_activities is the file that contains the output script's terminal output i.e. all recorded terminal activities.

Now, do whatever you want to do in your Terminal. For example, I am going to run some random Linux commands in my Terminal.

$ lsb_release -a
$ uname -a

After running all commands, end the recording with command:

$ exit

After done with the recording, simply replay it with command:

$ scriptreplay -t=time.log my_terminal_activities

Or,

$ scriptreplay --timing=time.log my_terminal_activities

This command will start to replay the recorded terminal session instead of just showing the whole activity.

Here is a sample output from my Ubuntu 18.04 system:

Play Recorded Terminal Sessions Using Scriptreplay Command On Linux

Increase or decrease playback speed

By default, Scriptreplay will replay the output at the same speed as the way it originally appeared when the typescript was recorded. You can, however, increase or decrease the playback speed as you please.

For example, to replay the typescript at double(i.e. 2x speed) the original speed, run:

$ scriptreplay -t=terminal.log my_terminal_activities 2

To replay a typescript at half the original speed:

$ scriptreplay -t=terminal.log my_terminal_activities 0.5

To replay script with ten times slower than the original speed, run:

$ scriptreplay -t=terminal.log my_terminal_activities 0.1

Please note that Scriptreplay simply displays the session activity recorded with Script command. It will not actually run the commands/programs that were run when the typescript was recorded. Since the same information is simply being displayed, scriptreplay is only guaranteed to work properly if run on the same type of terminal the typescript was recorded on.

For help, run:

$ scriptreplay --help

Usage:
 scriptreplay [-t] timingfile [typescript] [divisor]

Play back terminal typescripts, using timing information.

Options:
 -t, --timing <file>     script timing output file
 -s, --typescript <file> script terminal session output file
 -d, --divisor <num>     speed up or slow down execution with time divisor
 -m, --maxdelay <num>    wait at most this many seconds between updates
 -h, --help              display this help
 -V, --version           display version

More details can be found in the man pages.

$ man scriptreplay

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