Nan-Zhang

To format a line to the left I use :left. Use this format an entire file:

:%le

grep -E "[0-9]{3}-[0-9]{7}" ./test/* | wc -l

grep -lE "[0-9]{3}-[0-9]{7}" ./test/*
-E activates regular expressions (you could use egrep instead)

-l filters grep results, only the file name will be printed

	export PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "
	export CLICOLOR=1
	export LSCOLORS=ExFxBxDxCxegedabagacad
	alias ls='ls -GFh'

	The first line changes the bash prompt to be colorized, and rearranges the prompt to be “username@hostname:cwd $”

	The next two lines enable command line colors, and define colors for the ‘ls’ command

	Finally, we alias ls to include a few flags by default. -G colorizes output, -h makes sizes human readable, and -F throws a / after a directory, * after an executable, and a @ after a symlink, making it easier to quickly identify things in directory listings.

	show ith of a: a & 1 << i

	reset ith of a: a &= ~(1 << i)

	populate the result: result \|= 1 << i

	(-i) & i; //NOTE from right to left, get first '1' and other bits is '0'

	n & (n - 1) == 0 check if n is power of 2

	Shift + V for visual line to select the lines in visual mode


	If all that is wanted is to display the name of the current file, type Ctrl-G (or press 1 then Ctrl-G for the full path).

	1. Type gg to move the cursor to the first line of the file, if it is not already there.
	2. Type dG to delete all the lines.