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Full Discussion: what does this command do?
Top Forums Shell Programming and Scripting what does this command do? Post 302190295 by wrapster on Tuesday 29th of April 2008 09:21:33 AM
Old 04-29-2008
what does this command do?

Hi all,

I would like to know how this command works

exec </dev/console >/dev/console 2>&1

Also please pay particular attention to the syntax and i would like to know if the syntax is correct (particularly the spacing!!)
Am trying to debug a script at boot time and am not getting any errors so thought i would use this to figure out what's going wrong?

Thanks
 

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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 +- }} } SEE ALSO
error(n), break(n), continue(n) KEYWORDS
catch, error Tcl 8.0 catch(n)
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