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exit(3tcl) Tcl Built-In Commands exit(3tcl) 





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 exists 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(3tcl)






KEYWORDS


abort, exit, process







  

    
    Tcl