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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catch(n)						       Tcl Built-In Commands							  catch(n)

__________________________________________________________________________________________________________________________________________________

NAME
catch - Evaluate script and trap exceptional returns SYNOPSIS
catch script ?varName? _________________________________________________________________ DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe- cute script, and always returns without raising an error, regardless of any errors that might occur while executing script. If script raises an error, catch will return a non-zero integer value corresponding to one of the exceptional return codes (see tcl.h for the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret- ing script. If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script. Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error. EXAMPLES
The catch command may be used in an if to branch based on the success of a script. if { [catch {open $someFile w} fid] } { puts stderr "Could not open $someFile for writing $fid" exit 1 } The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will be generated. proc foo {} { catch {expr {1 +- }} } KEYWORDS
catch, error Tcl 8.0 catch(n)