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Top Forums Shell Programming and Scripting Goto - UNIX v6 Manual Questions Post 302929690 by Scrutinizer on Wednesday 24th of December 2014 09:54:57 AM
Old 12-24-2014
This seems to me is referring to the historical Thompson shell (Its successor Bourne Shell in UNIX v7 did not have a goto...)

1.
I think it means that you cannot use gotos if you use the shell interactively.
V6 Thompson Shell Port - Manuals - GOTO(1)

Presumably because there is a separate, external goto command that needs to go look for the goto label, once invoked

2.
I would think that if the manual is explicit like that, only : end would be allowed (: being the first character on the line) with any number of spaces. The other label is maybe from another script, perhaps sed ?
See also :
V6 Thompson Shell Port - Manuals - GOTO(1)

3.
Quote:
If such a line is found, goto repositions the command-file offset to the line after the label and exits
V6 Thompson Shell Port - Manuals - GOTO(1)

So it does seem that no commands will be processed on the line with the label.

Last edited by Scrutinizer; 12-24-2014 at 12:09 PM..
These 2 Users Gave Thanks to Scrutinizer For This Post:
 

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exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. 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, following 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 word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)

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