econd case, the second word is $LINENO, so the current line number
is 1 (2 in current versions, since -c command initializes to 1). Everything
else works as before.
--
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``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, U
know how
prevalent that is.
but, again, that's aimed at apps.
Yep, bash is definitely a unicorn here.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.
On 7/8/23 7:41 AM, Rob Landley wrote:
On 7/6/23 20:09, Chet Ramey wrote:
...
Distinguishing : from true seems deeply silly
true wasn't a special builtin in the Bourne shell.
It isn't because it wasn't. Historical reasons, no other pattern or logic.
Is there pattern or logic
On 7/9/23 7:43 PM, Rob Landley wrote:
On 6/18/23 16:28, Rob Landley wrote:
On 6/12/23 19:40, Chet Ramey wrote:
I wish you were not so reluctant. Look at how many things you've discovered
that I decided were bugs based on our discussions.
But since you asked, today's new question I wrestled
t a lot
of value, but you're right, sometimes you have to break it. That's why bash
has its compatibility mode. But it seems like gradually fixing things, or
adding a compatibility mode setting, sometimes only gives people the
opportunity to complain simultaneously about both the problem and the
s
know you will, it's best to start looking forward to it now.
Chet
--
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``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
_
our distro can't even be bothered to apply all the patches for a
single version?
Devuan is a thin skin over Debian, when I ask about this sort of thing on the
#devuan libra.chat channel they point me at
https://packages.debian.org/search?keywords=bash and similar.
Debian still has bug reports on th
On 6/30/23 8:57 PM, Rob Landley wrote:
On 6/12/23 19:40, Chet Ramey wrote:
I wish you were not so reluctant. Look at how many things you've discovered
that I decided were bugs based on our discussions.
But since you asked, today's new question I wrestled with was
Why does eval "&q
he EOF (-1) sentinel leaked into the string and
came out as an unsigned char (0xff). That's pretty clearly a bug.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.edu
On 6/17/23 7:23 PM, Rob Landley wrote:
On 6/12/23 19:40, Chet Ramey wrote:
and they have a list of "special built-in utilities" that does NOT include cd
(that's listed in normal utilities: how would one go about implementing that
outside of the shell, do you think?)
That's not what
On 6/12/23 5:23 PM, Rob Landley wrote:
On 6/9/23 15:23, Chet Ramey wrote:
On 6/8/23 10:31 PM, Rob Landley wrote:
On 6/5/23 18:08, Chet Ramey wrote:
You got me. You're right; I had it backwards.
I'm not trying to gotcha anybody, I'm just trying to understand what the right
thing to implement
On 6/8/23 10:31 PM, Rob Landley wrote:
On 6/5/23 18:08, Chet Ramey wrote:
But escaping a _newline_ is funny in that it glues lines together instead of
creating a command line argument out of the result, which means it has to be
special cased and obviously I'm special casing it wrong
On 6/5/23 1:04 AM, Rob Landley wrote:
On 6/1/23 10:20, Chet Ramey wrote:
On 5/29/23 12:39 PM, Rob Landley wrote:
But I'm still left with this divergence:
$ ./sh -c 'echo abc\'
abc
$ bash -c 'echo abc\'
abc\
The backslash doesn't escape anything, EOF delimits the token
f so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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``Ars longa, vita brevis'' - Hippocrates
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, the craft so long to lerne.'' - Chaucer
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with that, then roll forward if
you want to. Report things that seem wrong or inconsistent, and see if they
change in a future version.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UT
short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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< potatosalad
$ a
potatosalad
$ a
potatosalad
$ a() { cat; } <(echo hello)
bash: syntax error near unexpected token `<(echo hello)'
And here.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CW
e out of _our_ host /dev?)
It's not useful, true, but you can do it.
> Other than this, the only other example I can think of is telling the kernel:
>
> KCONFIG_ALLCONFIG=<(cat file) make allnoconfig
The reason to use process substitution is to communicate with asynchronous
child process
rly insane proposal about
unicode and locales:
https://lists.gnu.org/archive/html/bug-bash/2019-12/msg00013.html
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.c
hat any arbitrary shell script
can appear in $() command substitution, so I got a bunch of bug reports.
I ended up having to write special-case code for this, because bison/yacc
can't easily handle calling the parser recursively.
--
``The lyf so short, the craft so long to lerne.'' -
instance that can be ignored.)
The standard doesn't provide it to you at all, and most shells don't have a
way to obtain it.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduht
On 7/1/20 4:50 PM, Chet Ramey wrote:
>> But implementing it seems tricky: ${x;%} reliably errors whether or not x is
>> set, ${x~#%} never does (I can't find what ~ is supposed to do here in the
>> man
>> page,
>
> Of course the first one errors -- `x;' is not a
? The bash version of readline and the standalone version of readline
>> are identical. Identical consisting of the same source.
>
> Ask https://github.com/akinomyoga/ble.sh ?
Yeah, no.
>
>>>> Sure. That's why declare reports `?' as not found. It's not a variable.
but triggers in the else case of that test.
Yes, `+' is the opposite of `-'; I feel like Bourne was being clever when
he decided on that syntax.
> I have a great big todo item to make a math parser. I did an elaborate one in
> java years ago that handled triginometric functions and fractional
> exponentiation and such. But that was a long enough time ago I still thought
> digital watches Java was a pretty neat idea. I remember there were
> two stacks and I learned why reverse polish notation exists. You'd compare
> precedence to see whether you push the operation and argument, or perform it
> now
> and possibly consume your way down the tree, which is why I had to bother the
> posix guys to put the precedence BACK when they broke it in their html
> rendering
> of the expr command years ago because when I sat down to try it there they'd
> broken the spec...
That sounds ... complicated.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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e.
>
> $ echo ${*@notanerror}
Well, you can short-circuit if there are no positional parameters (in which
case `*' ends up expanding to null), or you can error because neither `n'
(bash-5.0) nor `notanerror' is a valid transformation operator. It's the
same thing as above.
>
>
the behavior of constructs like ${@##...}
and #{@:..}, and others, than to jam the parameters together.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
___
On 6/18/20 7:48 PM, Rob Landley wrote:
> On 6/18/20 1:46 PM, Chet Ramey wrote:
>> On 6/17/20 1:22 PM, Rob Landley wrote:
>>> Trying to figure out when spaces are and aren't allowed in ${blah} led to
>>> asking
>>> why echo ${!a* } is an error but ${!a@
On 6/18/20 2:46 PM, Chet Ramey wrote:
>> I'm pretty sure the array mangling logic ties in here somehow, but there's
>> some
>> missing error checking somewhere...
>
> Invalid transformation operators just expand to nothing.
Sorry, that's not right. Variables with
result being used as the parameter
for the rest of the expansion.
>
> I'm pretty sure the array mangling logic ties in here somehow, but there's
> some
> missing error checking somewhere...
Invalid transformation operators just expand to nothing.
--
The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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On 5/29/20 2:09 PM, Chet Ramey wrote:
>>> Bash-5.1 will change the way it does $SECONDS to use gettimeofday(), btw.
>>
>> Meanwhile, I'm fielding:
>>
>> https://github.com/landley/toybox/pull/210
>
> Ironically, gettimeofday() is more portable.
use gettimeofday(), btw.
>
> Meanwhile, I'm fielding:
>
> https://github.com/landley/toybox/pull/210
Ironically, gettimeofday() is more portable.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevi
t suite that assumes all the tests _succeed_ is easy to write.
If you mean "succeed or fail in predictable ways when given incorrect
input," sure.
If you're worried about leaving stray background jobs around, end your
test script with `wait'. But you can always save a background job's pi
ve something in the background, and
you know its job number or how to refer to it using %name, you can run bg
and fg to your heart's content, use `kill' to kill it, and use `wait' to
clean up.
Job control, at least the terminal-based aspects of it, is n
On 5/25/20 6:39 AM, Rob Landley wrote:
> On 5/24/20 4:32 PM, Chet Ramey wrote:
>>> In new tab:
>>> $ echo $LINENO\
>>> > $LINENO
>>> 22
>>> $ echo $LINENO
>>> 3
>>>
>>> It cares about the space.
>>
On 5/24/20 5:05 PM, Rob Landley wrote:
> On 5/24/20 3:46 PM, Chet Ramey wrote:
>>> No, I meant the LINENO on the second line isn't noticing it's on a later
>>> line,
>>> it's now reporting the first line for both LINENOs, and I thought my initial
>&g
and can return to its own caller asking for additional
> continuations because of unfinished blocks and here documents and trailing
> flow
> control characters).
So you're saying that `&' can either be a WORD (in the grammar sense) or an
operator depending on context? If that'
; confusion was about it NOT doing that?
I'm not sure myself.
The backslash-newline gets removed, so the command is a single logical
line, which, since the lexer was on line 1 when the parser figured out it
was parsing a simple command, is all on line 1. The simple command gets
the line numbe
st of shell WORDs, and a command list, which
is terminated by the *operator* `&'.
Unquoted `&' is always an operator, it is never a WORD, and so it can't
appear in a list of WORDs, which is what follows `in'.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
On 5/23/20 1:06 PM, Rob Landley wrote:
> On 5/23/20 9:41 AM, Chet Ramey wrote:
>> On 5/21/20 6:50 PM, Rob Landley wrote:
>>
>>>>> But the same command line in the current shell and in bash -c are parsing
>>>>> different despite presumably reading the
d
> to reboot the mainframe to stop. I got in trouble for that.)
Now that seems like a reaction due to embarrassment. It's not like the
developers could have done input validation or anything.
> Leaving posterity in a good position is sort of the point of the exercise,
> though:
Well, you hope to, at least.
--
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``Ars longa, vita brevis'' - Hippocrates
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On 5/19/20 4:03 PM, Rob Landley wrote:
> On 5/18/20 10:41 AM, Chet Ramey wrote:
>> On 5/17/20 7:11 AM, Rob Landley wrote:
>>> I had a reply window open to this when my laptop battery died, and
>>> thunderbird
>>> doesn't store unfinished messages like kmail an
pics to consider.
> I only started using bash in 1998. :)
And it was 10 years old at that time. Man, we've come a long way.
> If your current locale setting has an appropriate gettext database
> installed,
> $"strings" get looked up and replaced with translate
to be translated according to the current locale. If the
>current locale is C or POSIX, the dollar sign is ignored. If the
>string is translated and replaced, the replacement is double-quoted.
>
> was supposed to work. (HOW is it translated? Bash calls out to
> translate.google.com to convert english to japanese? Is there a thing humans
> can
> do to supply an external translation file? Is it just converting dates and
> currency markers and number grouping commas?)
You have a message catalog, install the right files, and use the gnu
gettext infrastructure to get translated versions of the strings you
mark. It's a shell script way of doing what bash does internally for its
own messages. Very little-used.
> Ah, gettext. That would explain why I don't know about it. I always used
> http://penma.de/code/gettext-stub/ in my automated Linux From Scratch test
> builds because it's one of those gnu-isms like info and libtool.
It will be in Posix one day.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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On 5/8/20 4:17 PM, Rob Landley wrote:
> On 5/6/20 2:32 PM, Chet Ramey wrote:
>> On 5/6/20 2:08 PM, Rob Landley wrote:
>>
>>>> You're blogging these bash corner cases, too?
>>>
>>> I was. I was recently asked to stop.
>>
>> Who asked you to s
ards.
Hey, it's supposed to be brief. I did consider how to handle the long
options, since it's easy to do the one-letter options, and decided there
wasn't really a better way to do it.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
On 5/5/20 1:47 PM, Rob Landley wrote:
> On 5/4/20 1:16 PM, Chet Ramey wrote:
>>> Still trying to work out what the "bash spec" would be, vs implementation
>>> details...
>>
>> I'll be interested when you get that spec done.
>
> I'd love to read it
On 5/4/20 12:20 PM, Rob Landley wrote:
> On 5/4/20 8:39 AM, Chet Ramey wrote:
>> On 5/2/20 4:01 PM, Rob Landley wrote:
>>
>>> Why does the export flag on $_ toggle?
>>
>> It does three different things. It's initially exported if bash inherits it
>&
.'' - Chaucer
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On 4/24/20 3:07 PM, Rob Landley wrote:
>
>
> On 4/24/20 10:55 AM, Chet Ramey wrote:
>> On 4/24/20 9:48 AM, Rob Landley wrote:
>>> Try this in bash, and hit ctrl-Z before it returns:
>>>
>>> /bin/echo $(ls /usr/bin; sleep 5)
>>>
>>>
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
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http:/
u have
to do more work that arrays give you for free. Since your primary group is
in ${GROUPS[0]}, referencing $GROUPS give you your primary group in a
painless fashion.
If you don't have arrays, you're not constrained by bash's builtin array
variables anyway.
Chet
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On 4/1/20 6:20 PM, Chet Ramey wrote:
> Dynamic variables only have their value functions called when the variable
> is referenced. When the variables are simply fetched (declare -p, and
> similar) or enumerated (building an export array), you get the value
> stored in the var
and RANDOM, at least, should accept arithmetic
expressions on assignment. I'll make that change.
Chet
--
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Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~
will make that change in the next devel branch push.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
__
On 3/16/20 8:54 AM, Rob Landley wrote:
> On 3/13/20 1:45 PM, Chet Ramey wrote:
>> On 3/13/20 12:27 PM, enh wrote:
>>
>>>> The dash folks would say so.
>>>
>>> except now you need two shells :-)
>>
>> Well, that's their bed. I would say
Hippocrates
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- Chaucer
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n again, I'm trying to implement more functionality in that budget than
> dash
> is. Does that make it less minimalist?
The dash folks would say so.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTe
On 3/12/20 12:53 PM, Rob Landley wrote:
> On 3/12/20 9:37 AM, Chet Ramey wrote:
>> On 3/11/20 11:55 PM, Rob Landley wrote:
>>> Word splitting isn't really a seperate step, exactly? "echo one two three"
>>> doesn't care about $IFS, and the out
th.
--
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sible.
>
> Also expansion of arguments should use the same or similar
> logic... so "rm -" -> "rm ./-" if there is a file "./-" would help.
This is something to suggest to the bash-completion folks.
--
``The lyf so short, the craft so long to lerne.'' -
remove everything that's not in posix", that was just a side effect.
Minimalism and POSIX conformance are the big selling points now, at least
on the shell side of things.
Chet
--
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ita brevis'' - Hippocrates
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On 3/9/20 4:10 PM, Rob Landley wrote:
> On 3/8/20 2:57 PM, Chet Ramey wrote:
>> Remember the brouhaha (this was at least 15 years ago) about the standard
>> saying that `set -e' only applied to simple commands and bash having the
>> audacity to implement what the stan
On 3/8/20 2:55 PM, Rob Landley wrote:
> On 3/8/20 11:44 AM, Chet Ramey wrote:
>> On 3/8/20 10:53 AM, Rob Landley wrote:
>>>
>>> I read through the posix shell bits long enough ago it was probably SUSv3
>>> rather
>>> than v4, but at the moment
to be an array, so as long as you DTRT when IFS is a
string variable, you should be free to do whatever you like.
> Sorry to bother you, I should have (and eventually did) figure this out for
> myself.
No bother.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
On 3/6/20 9:05 PM, Rob Landley wrote:
>>> you could try chet ramey or the bash mailing list... he joins in a lot
>>> of the shell discussions on the POSIX mailing list.
>>
>> I'm reluctant to trigger a change in bash's behavior that it's been doing
>> consis
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