Unix tricks • Hacker News Board

Re: Unix tricks

#51

Post by nicholassmith » Thu, Mar 07, 2013, 3:43 PM UTC

crusso wrote: post #20

The special bash command I'm most often asked about by shoulder surfers is !$. It substitutes the last argument in the previous command into the current one. For example: $ ls /some/long/path/somewhere/looking/around/ $ cd !$ cd /some/long/path/somewhere/looking/around/

I like that one and `!!` for the inevitable point I've forgotten to put sudo in before a command.

Re: Unix tricks

#52

Post by VeXocide » Thu, Mar 07, 2013, 3:47 PM UTC

Instead of

    ProxyCommand ssh -T host1 'nc %h %p'

you can use

    ProxyCommand ssh -W %h:%p host1

which uses ssh itself and therefor also works on machines where netcat isn't installed.

Re: Unix tricks

#53

Post by Ensorceled » Thu, Mar 07, 2013, 3:50 PM UTC

Weird, I've been using vi/elvis/vim/MacVim as my primary editor since 1984 and I hate vi key bindings for shell; I always use the emacs bindings.

Re: Unix tricks

#54

Post by growt » Thu, Mar 07, 2013, 3:50 PM UTC

If I may add a trick:

ctrl-z - stops a program

bg - sends the stopped program to the background

fg - gets the program back to the foreground (interactive mode)

very useful in editor sessions or when you want to get rid of the endless download/scp that is blocking your terminal

Re: Unix tricks

#55

Post by etrain » Thu, Mar 07, 2013, 3:50 PM UTC

His last trick - compressed fie transfer without intermediate state:

  'tar cz folder/ | ssh server "tar xz"'

Can be pulled off with two flags to scp - and you get to see progress as a benefit!

  scp -Cr folder server:dest/

Re: Unix tricks

#56

Post by AaronBBrown » Thu, Mar 07, 2013, 3:51 PM UTC

Ensorceled wrote: post #53

Weird, I've been using vi/elvis/vim/MacVim as my primary editor since 1984 and I hate vi key bindings for shell; I always use the emacs bindings.

I'm the opposite. Every time I log into a server that doesn't have my bashrc, I immediately have to `set -o vi` or else I'm useless.

Re: Unix tricks

#57

Post by sp332 » Thu, Mar 07, 2013, 3:51 PM UTC

growt wrote: post #54

If I may add a trick: ctrl-z - stops a program bg - sends the stopped program to the background fg - gets the program back to the foreground (interactive mode) very useful in editor sessions or when you want to get rid of the endless download/scp that is blocking your terminal

You can also use "jobs" to see background and stopped tasks. If there are multiple jobs, you can use "fg 2" to foreground the second job on the list, etc.

Re: Unix tricks

#58

Post by 65a » Thu, Mar 07, 2013, 3:52 PM UTC

Here's one it took me a while to figure out...

Hung SSH session (such as wifi out of range)?

Type Return-Tilde-Period

Re: Unix tricks

#59

Post by init0 » Thu, Mar 07, 2013, 3:52 PM UTC

Md version for readabilty https://gist.github.com/hemanth/5109020

Re: Unix tricks

#60

Post by lucastheisen » Thu, Mar 07, 2013, 3:53 PM UTC

nathanstitt wrote: post #15

Whut? ctrl-r? How have I missed that? No more 'history|grep foo' for me!

If you are using 'set -o vi', then you can just use 'ESC' -> '/' then use 'n' to iterate in reverse order through the commands that match the vi regex. really powerful and useful.