unix "script" command (Security)


 
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Old 10-07-2002
Krusty,

You will have a problem with this if your users use vi. It is not very compatible with the script command.

Commands like cat and more and vi will cause grief for you.


From the man page for script.


WARNINGS
A command such as cat scott, which displays the contents of the
destination file, should not be issued while executing script because
it would cause script to log the output of the cat command to itself
until all available disk space is filled. Other commands, such as
more(1), can cause the same problem but to a lesser degree.

script records all received output in the file, including typing
errors, backspaces, and cursor motions. Note that it does not record
typed characters; only echoed characters. Thus passwords are not
recorded in the file. Responses other than simple echoes (such as output from screen-oriented editors and ksh command editing) are
recorded as they appeared in the original session.



Smilie
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script(1)						      General Commands Manual							 script(1)

NAME
script - Makes a transcript of terminal session SYNOPSIS
script [-a] [file] The script command makes a transcript of everything printed on your terminal. OPTIONS
Appends the transcript to file rather than writing it to file. OPERANDS
The name of an output file that will contain the transcript of the session. If this parameter is omitted, the file typescript is written. DESCRIPTION
The transcript is written to file, or appended to file if the -a option is given. If no file name is given, the transcript is saved in the file typescript. The script ends when the forked shell exits. This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create an example of a working session this way). If you specify the -a option and the file does not exist, it is created. If you do not specify the -a option and the file exists, it is replaced. RESTRICTIONS
The script command requires a streams based terminal. In single user mode, streams may not be enabled. Under these circumstances, script will exit with no action. If you are the superuser and need to run this command in single user mode, use the following special instruc- tions. Enabling Streams If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams. This command is avail- able to the superuser only. SEE ALSO
Commands: autopush(8), cat(1), echo(1), strsetup(8), tee(1) System Administration script(1)