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unix "script" command (Security)

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Top Forums UNIX for Advanced & Expert Users unix "script" command (Security)
# 8  
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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LEARN ABOUT CENTOS

error::pass1

ERROR::PASS1(7stap)													       ERROR::PASS1(7stap)

NAME

       error::pass1 - systemtap pass-1 errors

DESCRIPTION

       Errors  that occur during pass 1 (parsing) usually mean a basic syntax error of some sort occurred in the systemtap script.  There are sev-
       eral classes of problems possible:

       plain syntax error
	      The systemtap script parser detects a large variety of errors, such as missing operands, bad punctuation.  It  tries  to	list  what
	      kinds  of  tokens  it was expecting to see, and will show the region of the source code with the problem.  Please review the stap(1)
	      man page and/or the tutorial, to correct the script's syntax.

       grammar ambiguities
	      There is at least one known ambiguity in the systemtap grammar.  It relates to the optionality of ; (semicolon)  separators  between
	      statements, and the ++ and -- increment/decrement operators.  If the parser indicates an error, consider adding some explicit ; sep-
	      arators between nearby statements and try again.

       missing command line arguments
	      A systemtap script that uses the $N and @N constructs for substituting in command-line options may fail if not enough  options  were
	      given on the stap command line.

       compatibility changes
	      Some  versions  of systemtap have changed the language incompatibly, for example by adding the try/catch keywords for exception han-
	      dling.  In such cases, rerun systemtap with the --compatibility=VERSION option, substituting the last systemtap version  where  your
	      script was known to work.  You may also check the release-history NEWS file for compatibility changes.

GATHERING MORE INFORMATION

       Increasing the verbosity of pass-1 with an option such as --vp 1 can help pinpoint the problem.

SEE ALSO

       stap(1),
       error::reporting(7stap)

															       ERROR::PASS1(7stap)