Can I do it better?

Both work, the advantage of second one is you can concatenate it with normal strings

should i make any variable $foo to “${foo}” ?

i guess no down side in using curly braces for most variables

$var is exactly the same as ${var}, but imagine if you would need to insert a variable value in the middle of a word or a link:
https://www.some$varlink.com
is it $var? or is it $varlink now? In order to disambiguate the situation and prevent the usage of a wrong variable identifier (because $varlink will be used in this case) you enclose the variable identifier inside curly braces:
https://www.some${var}link.com

no, there is no down side. the fact that you would use curly braces on every variable would only add consistency/uniformity to your code

Exactly that. No exceptions. Less thinking required

Thanks mate i understood it very well thanks alot

It is just like in windows we uses ” “so that if any folder have spaces in it then it will consider it one name just like that

plan9 is a real OS, it’s very healthy and has its own utilities, shell(rc), and other stuffs. you can try the ports, I did some stuffs with rc back in the past.

https://archlinux.org/packages/community/x86_64/plan9port/

But I don’t think it’s worth looking at it now.

like in 10 years then?

😂 dunno depends on what you want, that’s for me, I just stopped doing things for nothing, more objective now.

When I was younger, I was very exited about Plan9 and Hurd… Now both are being forgotten…

The only “real” thing about Plan9 I have seen recently is the 9p protocol used in KVM

I too, I was very excited about Plan9

Did not know about that, oh that’s cool, just that I forgot everything about it, I don’t even remember that 9p :).

Maybe I’ll try it again(just for fun) when I’m 70(if I’m still alive)? lol I’m just ~ 20.

fortune was good 🙂

Also /proc filesystem is from plan9 AFAIK

in scripts i either use “${var1?mandatory var1 was not set}” or “${var1:-default value}” anyway

good practice I’d say 😛

combined with set -e it’s an easy way to assert vars are set before continuing

hi there, I’m investigating an issue on an “external resource” that sometime somehow magically disapears… I like to know when it is deleted. Let say I have a magic command to look at this resource

querythethings | grep “it-is-ok”

my first idea was to use watch and time

time watch –chgexit ‘querythethings | grep “it-is-ok”‘

can I do it better?maybe recording the result to file? maybe logging the date and time in place of the duration?

ssh 1.2.3.4 test -f /path/to/file

not sure if that’s what you’re asking exactly

there’s also inotify for file changes on the system

inotfiy_add_watch(STDOUT, “path/to/file”, IN_DELETE);

no it is not a file, let say it could be something like ‘curl https://something’

while curl -s ‘somesite.com’; do sleep 5; done && date

once curl exits unsuccessfully, it would continue onto &&

easy…I like it!!!!! thanks

nice

Most everyone, if they still use the weird research operating system, have moved to 9front. The original Bell Labs distribution doesn’t see a lot of activity.

There’s Plan 9 from User Space in case you want some of the tools natively on Unix.

I ported Inferno, the weird research operating system that thinks it’s a weird virtual machine, to L4 when I should’ve been writing my master’s thesis.

It was actually an operating system in its own right, meant mostly as a research vehicle.

@smol_mazunki you seem to use a curl a lot. I only know basics and want to know more of it (actually don’t wanna use a GUI, like postman, insomnia etc.)
Can you point to some resource which tell important things about curl. I need somewhat extensive guide

i only use curl in scripts

The more you use the tool the more comfortable you’ll feel with it. Also: man curl should be your first source of knowledge.