Rust Programming Language Rust Belt Rust 2016, 9 Jan 2017

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From YouTube: Beyond the up arrow (Lightning Talk) — Bill Laboon

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A

So I was actually deliberately told several times today. I would not be giving a lightning talk, so so this is towed. This is really lightning talk. This is maybe like a thunder talk since I did absolutely no preparation, so the title of the talk is beyond the up arrow. So what I see is a lot of people there. You know working at the command line. They want to do something they've done before, and so a barrow oppo oppo a book for what they were doing before, but it turns out their act and I apologize.

A

You can see so my other stuff here I'm going to bother getting rid of it, nothing secret. What people may not know there's a lot there, a lot better ways, there's actually a whole variety of ways of dealing with your command line history, so first you'll see I actually have a number. Next to my prompt again, this is totally you know uh from scratch. I otherwise would have started at one but we're starting at 15,000 397.

A

So one thing you can do is: if you do the history command. It'll tell you, you know what what did you type you know recently, so you can see my following along yesterday and so again. Normally what someone might do if they wanted to like, say rerun a cargo bill to go up up up there we go, but I can see here from running history, while that was a command 15 391, so I do bang !, 15, 391 and boom I'm in the wrong directory, but I was able to run it again.

A

Yah deacon you can tell this is like you know very unscripted so, but you can see. I can run that command just by using bang and then the number of that command. There are actually a lot of other sort of bang abbreviations that you can use. So, let's start I'm going to do see if there's a file in this directory.

A

Let me go into a directory that has a file here. We go Kark I want to look at cargo tamil, so cat cargo, tamil and then I. Think oh I want to cat that out again: okay, cuz acts. You know uh whatever I'm gonna do this command again, so you could just do up arrow enter. You also can do bang bang, which does the last command. You think. Well that actually does not save me a keystroke lagoon. Why would I do that?

A

But it actually becomes a more interest more interesting. You can add things on fits almost like its own little programming language. So let's say you want to see what the last thing you type was. You don't want to actually execute it, so you can do bang bang colon P, which just prints out what you did so this can also be calm. If you want to see something you did like a while ago, like back 13, 951 I want to look.

A

What was that is that a typo there, but I replaced be with B equals short B, plus a for that command. So with these bangs you can also not just do absolute references like that. You can say all right. What did I do three commands ago, bang minus three or what did I do ten commands ago? Bang I pinged google. Apparently, oh, it's always amazing. What do I do in my spare time?

A

um Realis I, know you're all excited, so we can also look at things a little bit more granularly if we want to access specific elements of a command that we typed in so before. I had cat cargo tamil right, but let's say I want to edit it so emacs dash and w give me the last argument from the last command bang dollar. So this is going to open up well. Actually, a first can give me a little emacs error and then it emacs is the latter edits the last the last argument of the last command.

A

You can actually get more into detail, let's say instead of just bang dollar, let's say: I'm catting, a bunch of files, so cargo tamil cargo, lock, okay and I'm, like oh I, just want to edit the the one remember so there's ear. The first argument is 0. The second is one that the third is to etc. So bang colon one will edit the second element of that. Okay. So on you can actually combine these two, like let's say I want to edit.

A

Emacs, thus, two commands back the last argument from it and I. Actually don't want to do this command I just want to print it out, so Emacs banging minus two dollar p, so it's just I would have edited cargo dot lock. So there's a whole bunch of these bank commands that are actually really useful for constructing your history and one last thing I wanted to talk about and for I know. Someone said like everyone on rust does Emacs soon I was just the core team.

A

I assume that applies to everyone here, hey uh I said you could actually what's that I? Don't know about that control, our does a reverse search, so you can just from the command line search. I went and it will interactively. Ser was last time I used cat and then I say enter and selected, so you can actually do that reverse search. So we have the bang commands history to see the number and reverse search.