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The script  command makes a copy (type script) of a terminal session. It probably would be better called carboncopy. The most common use of script  is to document terminal session. By running script  you log all the information displayed on your terminal. You can then print the log file or view it with an editor. In a way script is a specialized tee for the shell.

When you run script  a new shell is forked. This new shell makes a complete copy of everything displayed on your terminal. It reads standard input and output for your terminal tty and stores the data in a file. The default filename is typescript.

To exit from a script  session you simply press Ctrl-D  or type exit.

Format of the scriptcommand.

     script [ -a ] [ typescript_file ]

Options

-a  Append the output of scriptto file. Normally scriptbegins writing to a new file; if the file exists it is overwritten unless you specify the -a option. This is the only option present in all versions of Unix.

Gnu version (Linux) has three additional options

-f
Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can supervise real-time what is being done using `cat foo'.
-q
Be quiet.
-t
Output timeing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays.

typescript file specifies output file. If no output file is specified, the output of scriptis placed in the file named typescript

 If  applications with cursor control were used, control characters will reside in the output file produced by script. Therefore, if you send the file to a printer or terminal, it may not print or display properly. You can use the col command to remove control characters from the typescript file.


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The Unix script command

script is a standard Unix command that records a script of your interaction with the Unix system. Once it's started, it works "in the background", meaning that you continue to work normally, but the script session is dumping everything that shows up on your screen (more or less*) into some file. To start a script session, issue the command script to the Unix shell; then continue on working normally as long as you like. If you don't provide a file name to the script command, it places its output in a default file named typescript, but for CS125, I recommend you name your script file hwn.txt, where n is the number of the programming assignment you're doing. Whatever you do, do not use the name of your program's source code file as the filename for the output of the script command. If you type script hello.c, the output from the script command will overwrite and destroy whatever used to be in hello.c  

When you decide you don't need to record stuff anymore, exit from the scripting session by issuing the command exit to the Unix shell. Here's a picture and some further discussion:

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Linux

Script 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

Options:

-a
Append the output to file or typescript retaining the prior contents.
-f
Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can supervise real-time what is being done using `cat foo'.
-q
Be quiet.
-t
Output timeing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays.

The script ends when the forked shell 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. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal.

AIX

Makes a typescript of a terminal session.

script [ -a ] [ File ]

-a Appends the typescript to the specified file or to the typescript file.

The script command makes a typescript of everything displayed on your terminal. The typescript is written to the file specified by the File parameter. The typescript can later be sent to the line printer. If no file name is given, the typescript is saved in the current directory with the file name typescript.

The script ends when the forked shell exits.

This command is useful for producing hardcopy records when hardcopy terminals are in short supply. For example, use the script command when you are working on a CRT display and need a hardcopy record of the dialog.

Since the script command sets the SetUserID mode bit, due to security reasons the value of LIBPATH variable is unset when the command is invoked. However, LIBPATH is automatically reset in the forked shell if it is defined in the environment file. For related information, see the exec subroutine.



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