* Help find Zsh' Bash `read -N1 -p "Put here " var @ 2023-08-22 12:23 Budi 2023-08-22 12:44 ` Pier Paolo Grassi ` (2 more replies) 0 siblings, 3 replies; 11+ messages in thread From: Budi @ 2023-08-22 12:23 UTC (permalink / raw) To: Zsh Users What is the Zsh equivalent for Bash: read -N1 -p "Put here " var ? AI chat gave no solution ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 12:23 Help find Zsh' Bash `read -N1 -p "Put here " var Budi @ 2023-08-22 12:44 ` Pier Paolo Grassi 2023-08-22 14:19 ` Budi 2023-08-22 15:21 ` zeurkous 2023-08-22 17:42 ` Stephane Chazelas 2 siblings, 1 reply; 11+ messages in thread From: Pier Paolo Grassi @ 2023-08-22 12:44 UTC (permalink / raw) To: Budi; +Cc: Zsh Users [-- Attachment #1: Type: text/plain, Size: 701 bytes --] the manual offers: -k [ num ] Read only one (or num) characters. All are assigned to the first name, without word splitting. This flag is ignored when -q is present. Input is read from the terminal unless one of -u or -p is present. This option may also be used within zle widgets. Note that despite the mnemonic `key' this option does read full characters, which may consist of multiple bytes if the option MULTIBYTE is set. Pier Paolo Grassi Il giorno mar 22 ago 2023 alle ore 14:23 Budi <budikusasi@gmail.com> ha scritto: > What is the Zsh equivalent for Bash: read -N1 -p "Put here " var ? > > AI chat gave no solution > > [-- Attachment #2: Type: text/html, Size: 1287 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 12:44 ` Pier Paolo Grassi @ 2023-08-22 14:19 ` Budi 2023-08-22 14:30 ` Peter Stephenson 0 siblings, 1 reply; 11+ messages in thread From: Budi @ 2023-08-22 14:19 UTC (permalink / raw) To: Pier Paolo Grassi; +Cc: Zsh Users the ... -p "Put here " var ? On 8/22/23, Pier Paolo Grassi <pierpaolog@gmail.com> wrote: > the manual offers: > > -k [ num ] > Read only one (or num) characters. All are assigned > to the first name, without word splitting. This flag is ignored when -q is > present. Input > is read from the terminal unless one of -u or -p is > present. This option may also be used within zle widgets. > Note that despite the mnemonic `key' this option does > read full characters, which may consist of multiple bytes if the option > MULTIBYTE is set. > > Pier Paolo Grassi > > > Il giorno mar 22 ago 2023 alle ore 14:23 Budi <budikusasi@gmail.com> ha > scritto: > >> What is the Zsh equivalent for Bash: read -N1 -p "Put here " var ? >> >> AI chat gave no solution >> >> > ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 14:19 ` Budi @ 2023-08-22 14:30 ` Peter Stephenson 0 siblings, 0 replies; 11+ messages in thread From: Peter Stephenson @ 2023-08-22 14:30 UTC (permalink / raw) To: Zsh Users > On 22/08/2023 15:19 Budi <budikusasi@gmail.com> wrote: > the ... -p "Put here " var > ? read -k 1 REPLY'?Type a character: ' > On 8/22/23, Pier Paolo Grassi <pierpaolog@gmail.com> wrote: > > the manual offers: > > > > -k [ num ] > > Read only one (or num) characters. All are assigned > > to the first name, without word splitting. This flag is ignored when -q is > > present. Input > > is read from the terminal unless one of -u or -p is > > present. This option may also be used within zle widgets. > > Note that despite the mnemonic `key' this option does > > read full characters, which may consist of multiple bytes if the option > > MULTIBYTE is set. > > > > Pier Paolo Grassi > > > > > > Il giorno mar 22 ago 2023 alle ore 14:23 Budi <budikusasi@gmail.com> ha > > scritto: > > > >> What is the Zsh equivalent for Bash: read -N1 -p "Put here " var ? > >> > >> AI chat gave no solution > >> > >> > > ^ permalink raw reply [flat|nested] 11+ messages in thread
* RE: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 12:23 Help find Zsh' Bash `read -N1 -p "Put here " var Budi 2023-08-22 12:44 ` Pier Paolo Grassi @ 2023-08-22 15:21 ` zeurkous 2023-08-22 15:34 ` Ellenor Bjornsdottir 2023-08-22 17:42 ` Stephane Chazelas 2 siblings, 1 reply; 11+ messages in thread From: zeurkous @ 2023-08-22 15:21 UTC (permalink / raw) To: Budi, Zsh Users On Tue, 22 Aug 2023 19:23:23 +0700, Budi <budikusasi@gmail.com> wrote: > AI chat gave no solution This has to be some kind of parody. --zeurkous. -- Friggin' Machines! ^ permalink raw reply [flat|nested] 11+ messages in thread
* RE: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 15:21 ` zeurkous @ 2023-08-22 15:34 ` Ellenor Bjornsdottir 2023-08-22 15:39 ` zeurkous 2023-08-22 17:01 ` Andreas Kusalananda Kähäri 0 siblings, 2 replies; 11+ messages in thread From: Ellenor Bjornsdottir @ 2023-08-22 15:34 UTC (permalink / raw) To: Budi, Zsh Users The snarky comments aren't well appreciated, zeurkous. Please don't chastise people for thinking GPT can do things it can't. OP, GPT can't help you understand or accomplish this task. It's just a language model and it doesn't actually understand anything. It's been missold as this super app that knows everything. What are you trying to do? Are you trying to read a single character from std. input into ${var}? (I opened the Bash operator's handbook to page... this thing https://www.gnu.org/software/bash/manual/html_node/Bash-Builtins.html and that looks to be what you were trying to do) If I open `man zshbuiltins` and scroll down to the info for the `read` command I am told I can pass -k and a number to `read`. I think someone in this thread already mentioned that, without explaining how they got that. -- Ellenor Bjornsdottir (she) sysadmin umbrellix.net ^ permalink raw reply [flat|nested] 11+ messages in thread
* RE: RE: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 15:34 ` Ellenor Bjornsdottir @ 2023-08-22 15:39 ` zeurkous 2023-08-22 17:01 ` Andreas Kusalananda Kähäri 1 sibling, 0 replies; 11+ messages in thread From: zeurkous @ 2023-08-22 15:39 UTC (permalink / raw) To: Ellenor Bjornsdottir; +Cc: Budi, Zsh Users While me has no intention of holding a discussion about this off-topic subject here, me'll at least take responsibility for me words. On Tue, 22 Aug 2023 15:34:18 +0000, Ellenor Bjornsdottir <ellenor@umbrellix.net> wrote: > The snarky comments aren't well appreciated, zeurkous=2E Me'd answer this w/ a "speak for yourself", *if* mewas being snarky. Suffice it to say that's not the case -- it's the idea of consulting some fancy ELIZA successor, instead of RTFMing, that makes me groan (& wonder how much faster humanty's backslide will get). > Please don't chast= > ise people for thinking GPT can do things it can't=2E Like AI (it's actually plain old boring ML, but that doesn't sound fancy enough for the n00bs, so the peddlers lie). But like mesaid: here, that's off-topic. Baai, --zeurkous. -- Friggin' Machines! ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 15:34 ` Ellenor Bjornsdottir 2023-08-22 15:39 ` zeurkous @ 2023-08-22 17:01 ` Andreas Kusalananda Kähäri 1 sibling, 0 replies; 11+ messages in thread From: Andreas Kusalananda Kähäri @ 2023-08-22 17:01 UTC (permalink / raw) To: Ellenor Bjornsdottir; +Cc: Budi, Zsh Users On Tue, Aug 22, 2023 at 03:34:18PM +0000, Ellenor Bjornsdottir wrote: > The snarky comments aren't well appreciated, zeurkous. Please don't chastise people for thinking GPT can do things it can't. > > OP, GPT can't help you understand or accomplish this task. It's just a language model and it doesn't actually understand anything. It's been missold as this super app that knows everything. > > What are you trying to do? Are you trying to read a single character from std. input into ${var}? (I opened the Bash operator's handbook to page... this thing https://www.gnu.org/software/bash/manual/html_node/Bash-Builtins.html and that looks to be what you were trying to do) > > If I open `man zshbuiltins` and scroll down to the info for the `read` command I am told I can pass -k and a number to `read`. I think someone in this thread already mentioned that, without explaining how they got that. > -- > Ellenor Bjornsdottir (she) > sysadmin umbrellix.net A little tip that may help with finding the documentation for zsh built-ins: if ((${+aliases[run-help]})); then unalias run-help; fi autoload -Uz run-help This will make the run-help command available, which will present the manual page for the command that you give it as an argument (including the correct documentation for zsh built-ins). According to the run-help source code: "Figure out where to get the best help, and get it." -- Andreas (Kusalananda) Kähäri SciLifeLab, NBIS, ICM Uppsala University, Sweden . ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 12:23 Help find Zsh' Bash `read -N1 -p "Put here " var Budi 2023-08-22 12:44 ` Pier Paolo Grassi 2023-08-22 15:21 ` zeurkous @ 2023-08-22 17:42 ` Stephane Chazelas 2023-08-22 19:01 ` Bart Schaefer 2023-08-22 19:03 ` Stephane Chazelas 2 siblings, 2 replies; 11+ messages in thread From: Stephane Chazelas @ 2023-08-22 17:42 UTC (permalink / raw) To: Budi; +Cc: Zsh Users 2023-08-22 19:23:23 +0700, Budi: > What is the Zsh equivalent for Bash: read -N1 -p "Put here " var ? [...] read -k 'var?Put here ' Would be the closest equivalent (note that zsh's read has had -k since 1994, while bash added its -N in 2010, copied from ksh where it was added in 2003). The read 'var?prompt' is from ksh (circa 1983) also in zsh from the first version from 1990, bash's -p is from 1996. The differences (that I can think of): - in bash, read -N1 still does backslash processing even though there's nothing to escape as IFS handling is not done and newline is not treated specially, so if you enter \, you still need to press another key. zsh's read -k reads one character. Chances are you'd want to add the -r option in bash to avoid that and align with the zsh behaviour. - in bash NUL characters are ignored, so you can enter as many ^@s as you want, read won't return. zsh will return upon ^@ and store a NUL in $var. - read -k reads from the terminal device regardless of where stdin comes from, and puts that device in a mode where it sends characters as soon as they are typed (and restore the original settings upon return); bash's read -N1, like ksh's reads from stdin, and if stdin is a terminal device, puts it in that mode above. You'd do read -u0 -k in zsh to read one character from stdin instead of the terminal, but then if stdin is a terminal, it doesn't change its settings which means you'd likely need to press Return for the terminal device to make anything available for "read" to read.. In any case, both read a *character*, not necessarily a *byte* and despite the "k", not necessarily all the characters that are sent upon a key or key combination. For instance - pressing Shift+a will send a "A" which is both one byte and one character. - pressing € will send one € character which in UTF-8 locales is made of 3 bytes - pressing the "Home" key will generally send a sequence of characters each generally made of one byte each, potentially varying between terminals. For instance, on the terminal I'm typing this on, ESC, [, 1 and ~ are sent, and you'd need 4 read -k or read -N1, or read -k4 or read -N4 to consume it. To read one byte, you'd use: LC_ALL=C read -u0 -k1 var # zsh LC_ALL=C read -rN1 var # bash with the caveat about NUL above. Actually, in bash, you'd probably be better of using: LC_ALL=C read -rd '' -n1 var That is read up to one byte from a NUL-delimited record. So read would return immediately upon the first byte received even if it's 0. Beware of the effect on the exit status though. -- Stephane ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 17:42 ` Stephane Chazelas @ 2023-08-22 19:01 ` Bart Schaefer 2023-08-22 19:03 ` Stephane Chazelas 1 sibling, 0 replies; 11+ messages in thread From: Bart Schaefer @ 2023-08-22 19:01 UTC (permalink / raw) To: Budi, Zsh Users On Tue, Aug 22, 2023 at 10:42 AM Stephane Chazelas <stephane@chazelas.org> wrote: > > - in bash, read -N1 still does backslash processing Compare "read -n1" (which you did reference in your later examples). > - read -k reads from the terminal device regardless of where stdin This can be changed by e.g. "read -k 1 -u 0" (or other descriptor number). > In any case, both read a *character*, not necessarily a *byte* > and despite the "k", not necessarily all the characters that are > sent upon a key or key combination. If one wants to read full key combinations from within a ZLE widget, one should use "zle read-command" instead. ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Help find Zsh' Bash `read -N1 -p "Put here " var 2023-08-22 17:42 ` Stephane Chazelas 2023-08-22 19:01 ` Bart Schaefer @ 2023-08-22 19:03 ` Stephane Chazelas 1 sibling, 0 replies; 11+ messages in thread From: Stephane Chazelas @ 2023-08-22 19:03 UTC (permalink / raw) To: Budi, Zsh Users 2023-08-22 18:42:02 +0100, Stephane Chazelas: [...] > with the caveat about NUL above. Actually, in bash, you'd > probably be better of using: > > LC_ALL=C read -rd '' -n1 var > > That is read up to one byte from a NUL-delimited record. So read > would return immediately upon the first byte received even if > it's 0. Beware of the effect on the exit status though. [...] Sorry, should have been: LC_ALL=C IFS= read -rd '' -n1 var While bash's read doesn't do IFS processing with -N, it does with -n, so you need to set IFS to the empty string for read as otherwise it would strip any character in $IFS if input before storing into $var. May be worth mentioning the sysread builtin from the zsh/system module which gives you more control when reading a fixed number of bytes (see info zsh sysread). -- Stephane ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2023-08-22 19:08 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-08-22 12:23 Help find Zsh' Bash `read -N1 -p "Put here " var Budi 2023-08-22 12:44 ` Pier Paolo Grassi 2023-08-22 14:19 ` Budi 2023-08-22 14:30 ` Peter Stephenson 2023-08-22 15:21 ` zeurkous 2023-08-22 15:34 ` Ellenor Bjornsdottir 2023-08-22 15:39 ` zeurkous 2023-08-22 17:01 ` Andreas Kusalananda Kähäri 2023-08-22 17:42 ` Stephane Chazelas 2023-08-22 19:01 ` Bart Schaefer 2023-08-22 19:03 ` Stephane Chazelas
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