Dotfile

keeping dotfiles somewhere is an good practice. Once you need setup new machine, It’s easier to bring back favourite aliases and configuration.

ZSH

Please check oh-my-zsh which brings tones of good magic.

In example:

alias | grep '\.\.\.' | head -n4
...=../..
....=../../..
.....=../../../..
......=../../../../..

Any SHELL

parallel processing using bash

Why ? Because we can! In real world it’s also useful, as sometimes you don’t want to use strong programming language and loose easy access to unix shell tools.

find ~/workspace/my_project -print0 -name '*.go' | xargs -0 -P3 -IITEM bash -c 'echo ITEM | wc -c'

Please have a look at: -print0 which means find will separate matched using null. Same null can be used by xargs as separator. -P means max processes executed by xargs.

brackets

rename using brackets for name evaluation

mv myfile{.txt,.md}

or use brackets to eval sequence or set

$ for i in {1..4}; do echo $i; done  
1
2
3
4
$ for i in {1,99,4}; do echo $i; done
1
99
4

Hide command from .${SHELL}_history

If you want to hide your action from being logged in ~/.bash_history you can put a space before it. Please checkout the difference between: echo llama & ` echo beer`.

$ echo 'llama'      
llama
$ history | tail -n2
10118  pwd
10119  echo 'llama'
$  echo 'beer' # <--- please focus on additional space here    
beer
$ history | tail -n2
10118  pwd
10119  echo 'llama'

Bang Bang

!! can be used to execute previous command. Please check the snippet. Once you press enter shell will autofill previous command and you can press enter one more time to execute it.

$ echo 'llama'
llama
$ !! # <--- bang bang
$ echo 'llama'
llama
$