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11:49
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A: Tell me my screen resolution!

manatworkBash + xrandr, 44 characters read -aa<<<`xrandr` echo ${a[7]}x${a[9]::-1} xrandr belongs to the X server, on Ubuntu is provided by x11-xserver-utils package. Sample run: bash-4.3$ read -aa<<<`xrandr`;echo ${a[7]}x${a[9]::-1} 1920x1080

Jonathan Allan
Jonathan Allan
I have no bash with a display, would xrandr|grep * work?
Maybe xrandr|grep *|cut -d' ' -f1? (using the matching line from your paste @TIO)
Ah yes it would, not sure what the OP wants in such a scenario though!
Jens
Jens
@JonathanAllan No, it wouldn't. An unescaped * is a glob that the shell expands to all files in the CWD.
Jonathan Allan
Jonathan Allan
@Jens huh it wouldn't what?
Jens
Jens
@JonathanAllan Work. Like you asked in your first comment.
Jonathan Allan
Jonathan Allan
What?! xrandr|grep * should not treat * as a glob as it's post-pipe :/
@Jens for example
Jens
Jens
11:49
@JonathanAllan Since when does the shell not glob expand after a pipe sign? That page you linked to with man man|grep * is crap.
Jonathan Allan
Jonathan Allan
@Jens That page is TIO, run by Dennis, one of the mods, It is running BASH.
are you running BASH somewhere? Have you tried it?
If your instance does not work then yeah you'd need ...|grep \* for a byte
but it only needs to work on some instance somewhere :p
Jens
Jens
I don't judge the quality of code by who wrote it. I judge by whether it does what it should. No, I haven't tried it, because I know how globbing works. But if seeing is believing: what does xrandr|echo * output on your machine?
Jonathan Allan
Jonathan Allan
It wont output anything on my machine I am on Windows mate.
Jens
Jens
bash on windows does not do globbing? Then it's broken.
Jonathan Allan
Jonathan Allan
I have no bash
and I do not know what it's SUPPOSED to do either
but shouldn't a pipe actually pipe?
i.e. run a command and pipe the output into another?
Jens
Jens
12:01
Yes it does. But commands in pipes can have arguments as well. And the shell expands globs BEFORE it starts any program in the pipeline.
Jonathan Allan
Jonathan Allan
The reason I said who is running it is so you can ask someone who actually knows this stuff and could explain why it is doing what it does AND fix it if it is wrong
weird that manatwork said "sure"
Jens
Jens
I'm on the POSIX comitte for Shell Standardization, if that means anything :-)
Jonathan Allan
Jonathan Allan
nope sorry means nothing to me "hand over head"
OK looked up "POSIX"
does not mean you should go around saying stuff is "crap"
Jens
Jens
Well, all I can says is that command|grep * expands the * in any shell and that is almost certainly not what the author intended. Glob expansion is suppressed by quoting.
Jonathan Allan
Jonathan Allan
most online bash will say man is unrecognised
Jens
Jens
12:05
I apologize for the harsh word.
Jonathan Allan
Jonathan Allan
the author is running some BASH...
so if it is wrong you can let him know!!
Jens
Jens
Does not matter. All Bourne shells behave the same in this regard.
Jonathan Allan
Jonathan Allan
maybe in the TryItOnline chat room
so why is it doing that then?
it is such a shell
Jens
Jens
Beats me. Maybe it's a markup problem, swallonging the quoting?
Jonathan Allan
Jonathan Allan
OK well I'll let him know then
Jens
Jens
12:07
Thanks, that would be helpful.
Jonathan Allan
Jonathan Allan
xrandr|echo * yields *
Jens
Jens
It yields empty here.
Jonathan Allan
Jonathan Allan
but xrandr will fail I believe
because no display it connected
but man man|echo * also yields *
Jens
Jens
Ok there is one exception, when globbing does not happen: when set -f (no filename expansion) is in effect. But the default for that is off.
Jonathan Allan
Jonathan Allan
NIX is so complicated LOL
Jens
Jens
12:11
I wouldn't touch a Windows shell with a ten foot pole :-)
Jonathan Allan
Jonathan Allan
you never need to though
Jens
Jens
I'm using Cygwin where I can, with zsh.
Mate, I need to work... nice having a chat with you :-)
I have deleted my harsh comment.
Jonathan Allan
Jonathan Allan
no problem, I wish I could understand NIX :p
Jonathan Allan
Jonathan Allan
12:30
@jens FYI the reason it works is because there are no files in the CWD.
so I guess it would be a valid submission to not escape it, just needs to be in it's own dir :p

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