script1

Usage

Overview

The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript.

If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.

The following options are available:

-a

Append the output to file or typescript, retaining the prior contents.

-d

When playing back a session with the -p flag, do not sleep between records when playing back a timestamped session.

-e

Accepted for compatibility with util-linux script. The child command exit status is always the exit status of script.

-F

Immediately flush output after each write. This will allow a user to create a named pipe using mkfifo(1) and another user may watch the live session using a utility like cat(1).

-k

Log keys sent to the program as well as output.

-p

Play back a session recorded with the -r flag in real time.

-q

Run in quiet mode, omit the start, stop and command status messages.

-r

Record a session with input, output, and timestamping.

-t time

Specify the interval at which the script output file will be flushed to disk, in seconds. A value of 0 causes script to flush after every character I/O event. The default interval is 30 seconds.

-T fmt

Implies -p, but just reports the time-stamp of each output. This is very useful for assessing the timing of events.

If fmt does not contain any ‘%’ characters, it indicates the default format: ‘%n@ %s [%Y-%m-%d %T]%n’, which is useful for both tools and humans to read, should be used. Note that time-stamps will only be output when different from the previous one.

The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if ignoreeof is not set) for the C-shell, csh(1)).

Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one.

Environment

The following environment variables are utilized by script:

SCRIPT

The SCRIPT environment variable is added to the sub-shell. If SCRIPT already existed in the users environment, its value is overwritten within the sub-shell. The value of SCRIPT is the name of the typescript file.

SHELL

If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically).

Examples

Record a simple csh(1) session with no additional details like input, output, and timestamping:

$ SHELL=/bin/csh script
Script started, output file is typescript
% date
Tue Jan  5 15:08:10 UTC 2021
% exit
exit
Script done, output file is typescript

Now, replay the session recorded in the previous example:

$ cat ./typescript
Script started on Tue Jan  5 15:08:08 2021
% date
Tue Jan  5 15:08:10 UTC 2021
% exit
exit
Script done on Tue Jan  5 15:08:13 2021

Record a csh(1) session, but this time with additional details like timestamping:

$ SHELL=/bin/csh script -r
Script started, output file is typescript
% date
Tue Jan  5 15:17:11 UTC 2021
% exit
exit
Script done, output file is typescript

In order to replay a sessions recorded with the -r flag, it is necessary to specify -p( cat(1) will not work because of all the aditional information stored in the session file). Also, let us use -d to print the whole session at once:

$ script -dp ./typescript
Script started on Tue Jan  5 15:17:09 2021
% date
Tue Jan  5 15:17:11 UTC 2021
% exit
exit
Script done on Tue Jan  5 15:17:14 2021