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- Newsgroups: gnu.bash.bug
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!ihspa.ATt.COM!danj1
- From: danj1@ihspa.ATt.COM (Dan Jacobson)
- Subject: I want # to be my interactive comment character; histchars bitch
- Message-ID: <1992Aug19We160535a.danj1@ihspa.att.com>
- Sender: gnulists@ai.mit.edu
- Organization: GNUs Not Usenet
- Distribution: gnu
- Date: Wed, 19 Aug 1992 20:05:00 GMT
- Approved: bug-bash@prep.ai.mit.edu
- Lines: 104
-
- [Bash 1.12] I want # to be my interactive comment character, so
- I will get this:
-
- bash$ echo bla # pla
- bla
-
- at the same time, I don't want to "enjoy" any "!" expansion (so, yes, I do
- set +o histexpand
- and, yes, it does work. No complaint about this).
-
- Now, about getting # to be my interactive comment character,
- First, we see under
- bash$ help
- |Type `help name' to find out more about the function `name'.
- |Use `info bash' to find out more about the shell in general.
- [by the way, you should add a note saying that "info" might not be
- installed at every site.]
- [...]
- bash$ help Variables
- | histchars Characters controlling history expansion and quick
- | substitution. The first character is the history
- | substitution character, usually `!'. The second is
- | the `quick substition' character, usually `^'.
- no mention of comment characters here. Plus the final "substition" is
- misspelled...[one of the Markowitz keywords that when misspelled may
- indicate stress during childhood :-)]
-
- $ man bash
- | histchars
- | The two characters which control history expansion and
- | tokenization. The first character is the history
- | expansion character, that is, the character which sig-
- | nals the start of a history expansion, normally `!'.
- | The second character is the character which signifies
- | that the remainder of the line is a comment, when found
- | as the first character of a word.
- ah ha... a different meaning for the second character! shame shame.
- But no word on how to assign that second character without also
- assigning a first character, and thus bringing on "! expansion
- pleasure" :-( , [perhaps set +o histexpand would then be the official
- recommended way of re-nullifying that hopefully...] but, ah, dear
- friends, the plot thickens:
-
- bash$ cat bash-1.12/documentation/features.texi
- |@vindex histchars
- |@item histchars
- |Up to three characters which control history expansion, quick
- |substitution, and tokenization. The first character is the
- |@dfn{history-expansion-char}, that is, the character which signifies the
- |start of a history expansion, normally `!'. The second character is the
- |character which signifies `quick substitution' when seen as the first
- |character on a line, normally `^'. The optional third character is the
- |character which signifies the remainder of the line is a comment, when
- |found as the first character of a word, usually `#'.
- still another definition! We're talking "anti family values", dear
- friends :-) And again, no word on how to assign the third character with
- out tripping off the first two... Indeed, when one looks at
- bash-1.12/subst.c, one sees code reminiscent of features.texi's
- version of the story.
-
-
- Plus, I tried using various combos of the above, and could not turn on
- my interactive comment character, though the evil "!" expansion stuff
- did come back to life...
-
- There are tons of times when I want to
- bash$ do some command #with the back half commented out
- bash$ #or even the whole thing commented out
- in an interactive shell. Therefore my needs are justified and I would
- like to see how one does it in bash 1.12. Hmmm?
-
- A further bitch about the man page:
- |COMMENTS
- | In a non-interactive shell, a word beginning with # causes
- | that word and all remaining characters on that line to be
- | ignored.
- in the _same spot in the manual_, you should tell folks how to turn # on
- for interactive shells.
-
- Plus, saying "a word beginning with #" implies that
- rm -rf bla # /
- will get different treatment than
- rm -rf bla #/
-
- Too bad if other leading brand shells have the same "word" mistake in
- their man pages.
-
- If you fix the "COMMENTS" part of the man page, you would also want to
- fix this part of the man page:
-
- $ man bash
- | histchars
- | The two characters which control history expansion and
- | tokenization. The first character is the history
- | expansion character, that is, the character which sig-
- | nals the start of a history expansion, normally `!'.
- | The second character is the character which signifies
- | that the remainder of the line is a comment, when found
- | as the first character of a word.
- ^^^^^^^^^^^^^^^^^^^^^^^^^
- --
- danj1@ihspa.att.com (Dan Jacobson) Naperville IL USA
- +17089796364 Chinese~{;}5$Da~}Ji1Dan1ni2
-
-