A Unix programmer heads over to the local diner to get something to eat for lunch. He, or Bob as he prefers, knows better than to manually scan the...
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What sort of monster does
cat | grep!?With real life menus with millions of lines, you usually start with
head | grep, and then, when you one-liner of 15 lines is complete, you replace head with cat and cross your fingersreal life menus with millions each? ;)
That was my attempt to make a joke
You can almost accomplish this entire task using awk. For example:
awk -F '$' '/shrimp/ {printf "%s- %.2f\n", $1, $NF}' < menu.txt
awk is Turing Complete.
s/almost//
Some people, including me:
reddit.com/r/programming/comments/...
Grep won't be able to find anything because you are searching for ! Which is not in the menu
I've been reading the thread about this on /r/programming (how circular!) and they're mostly (deliberately?) missing the point and trying to optimise it rather than to see it as a demonstration of pipes.
cough
EDIT: changed
\dshortcode for[0-9]so it'll work with BSD and GNU grep.That's what this bit at the end is for:
That bit of the regex will only match on a line that contains a dollar sign (
$), a single digit ([0-9]), and a literal dot (\.). So "$2.99" will match, but "$12.99" won't, because there are two digits between the dollar sign and the dot.Try it.
| rev | cut -d\ -f1 | revThe equivalent is much more readable with PowerShell:
$shrimp = Get-Content menu.txt | Select-String 'shrimp'
$price = $shrimp | ForEach-Object { $cols = $_ -split ' '; $cols[-1] }
$under10 = [decimal]$price.Substring(1) -lt 10
if ( $under10 ) { 'Available!' } else { ':(' }
Of course, you can use aliases to make this a bit "shorter", but then we're back in the world of Unix, where precious bytes have to be saved to achieve acceptable performance on 300 baud Teletype terminals:
$p = gc menu.txt | sls 'shrimp' | % { $c = $_ -split ' '; $c[-1] }
if ([decimal]$p.Substring(1) -lt 10) {'Available!'} else {':('}
Given this menu:
My Nix programmer does this:
awk rules!
if you are looking for meals under 10 bucks, as shown in
($NF < 10), why isn't caesar salad($6.50) in the output ?"test returns an exit status code of 1 if the condition passes or 0 if no match." It is actually backwards: reddit.com/r/programming/comments/...
Why are you guys alwas using awk for field separation? There ist
cut -d" " -f3that is nice as wellThis is why two unix programmers will never eat together, because they will start to discuss which is the best way to order the shrimps
Bob should've rounded up. He probably ran off when he remembered he didn't factor taxes in!
Oh & btw, he should've done a case insensitive grep
grep -i shrimp menu.txt. Although if he's using awk anyway, then he might have included that there too and avoid all those unnecessary pipes!awk '$0~/shrimp/{print $NF}In a lot of countries the tax is part of the price
You're blowing up on Reddit
I think we have a winner!
hahaha, it's amazing! Congratulations.
You need to replace your double quotes with literal single quotes. Here's why.
$ echo "Available!"
bash: !": event not found
$ echo 'Available!'
Available!
Hilarious!
This article is awesome. It really shows all the possibilities in Linux. I am quite surprised by the comments here where people are trying to correct you. Anyways, good job
Or, he could merely 'read' visually the menu??? Didn't realize this was a lesson in Unix coding until the end... :-) Laugh at me...
I don't like how there's no code for how to scrape the website into menu. txt. Incomplete solution! ;-)
It took me a while to realize that the price is truncated to an integer only because 'test' can't handle decimals. That might deserve a mention.
Awesome!
Why.