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exit(n) [centos man page]

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

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NAME
exit - End the application SYNOPSIS
exit ?returnCode? _________________________________________________________________ DESCRIPTION
Terminate the process, returning returnCode to the system as the exit status. If returnCode is not specified then it defaults to 0. EXAMPLE
Since non-zero exit codes are usually interpreted as error cases by the calling process, the exit command is an important part of signaling that something fatal has gone wrong. This code fragment is useful in scripts to act as a general problem trap: proc main {} { # ... put the real main code in here ... } if {[catch {main} msg options]} { puts stderr "unexpected script error: $msg" if {[info exist env(DEBUG)]} { puts stderr "---- BEGIN TRACE ----" puts stderr [dict get $options -errorinfo] puts stderr "---- END TRACE ----" } # Reserve code 1 for "expected" error exits... exit 2 } SEE ALSO
exec(n) KEYWORDS
exit, process Tcl exit(n)

Check Out this Related Man Page

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)
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