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Full Discussion: Stuck after typing goto
Top Forums UNIX for Dummies Questions & Answers Stuck after typing goto Post 302136930 by Perderabo on Thursday 20th of September 2007 01:19:04 PM
Old 09-20-2007
Wow! I have never encountered this before! Yet another reason to avoid csh. You must be using csh or tcsh as your shell. If you would switch to bash, you would not have this problem. But when csh sees an input line like "goto fubar", it will actually skip all further input lines until it encounters a line labeled "fubar". You can supply such an input line the first time. After that, another "goto fubar" sends it back to where it encountered the line labeled "fubar". Nice design...not.

Code:
$ csh
%echo $shell
/bin/tcsh
%goto fubar
goto? hello
goto? echo $shell
goto? fubar:
%date ; sleep 2
Thu Sep 20 13:06:49 EDT 2007
%
%
%
%echo we are gonna loop
we are gonna loop
%goto fubar
Thu Sep 20 13:07:16 EDT 2007
we are gonna loop
Thu Sep 20 13:07:18 EDT 2007
we are gonna loop
Thu Sep 20 13:07:20 EDT 2007
we are gonna loop
Thu Sep 20 13:07:22 EDT 2007
we are gonna loop
Thu Sep 20 13:07:24 EDT 2007
we are gonna loop
Thu Sep 20 13:07:26 EDT 2007
we are gonna loop

I'm guessing that the "fubar:" line needs to be in the history list in order to loop, but I don't feel like testing that.
 

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break(1)                                                           User Commands                                                          break(1)

NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)
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