概述

在使用linux的时候我们会经常碰到这样的问题，比如使用nmap，我后面到底加什么参数呢？碰到这种情况我们只能使用man或者它的帮助命令来查看使用方法，但是有的时候我们只是想要有一个使用的示例而已，man和帮助命令真的太长了，有时候对于我这种英文不好的人真的是看了也不会用，于是今天我推荐一个命令，名字叫cheat

安装

cheat是使用python开发的，使用pip安装就好
sudo pip install cheat
怎么安装python或者python的版本管理你可以看我的这篇文章
fedora安装pyenv实现python的版本管理

使用

对于这个命令真的可以说是相见恨晚，比如，如果你不知道docker这个命令怎么去使用你只要输入cheat然后加docker这个命令就好

  ~ cheat docker       
# Start docker daemon
docker -d

# start a container with an interactive shell
docker run -ti <image_name> /bin/bash

# "shell" into a running container (docker-1.3+)
docker exec -ti <container_name> bash

# inspect a running container
docker inspect <container_name> (or <container_id>)

# Get the process ID for a container
# Source: https://github.com/jpetazzo/nsenter
docker inspect --format {{.State.Pid}} <container_name_or_ID>

# List the current mounted volumes for a container (and pretty print)
# Source:
# http://nathanleclaire.com/blog/2014/07/12/10-docker-tips-and-tricks-that-will-make-you-sing-a-whale-song-of-joy/
docker inspect --format='{{json .Volumes}}' <container_id> | python -mjson.tool

# Copy files/folders between a container and your host
docker cp foo.txt mycontainer:/foo.txt

# list currently running containers
docker ps

# list all containers
docker ps -a

# list all images
docker images

而且列出来的示例很详细，简单又明了，再比如

  ~ cheat vim
# File management

:e              reload file
:q              quit
:q!             quit without saving changes
:w              write file
:w {file}       write new file
:x              write file and exit

# Movement

    k
  h   l         basic motion
    j

w               next start of word
W               next start of whitespace-delimited word
e               next end of word
E               next end of whitespace-delimited word
b               previous start of word
B               previous start of whitespace-delimited word
0               start of line
$               end of line
gg              go to first line in file
G               go to end of file
gk      move down one displayed line
gj      move up one displayed line

# Insertion
#   To exit from insert mode use Esc or Ctrl-C
#   Enter insertion mode and:

a               append after the cursor
A               append at the end of the line
i               insert before the cursor
I               insert at the beginning of the line
o               create a new line under the cursor
O               create a new line above the cursor
R               enter insert mode but replace instead of inserting chars
:r {file}       insert from file

# Editing

u               undo
yy              yank (copy) a line
y{motion}       yank text that {motion} moves over
p               paste after cursor
P               paste before cursor
<Del> or x      delete a character
dd              delete a line
d{motion}       delete text that {motion} moves over

# Search and replace with the `:substitute` (aka `:s`) command

:s/foo/bar/ replace the first match of 'foo' with 'bar' on the current line only
:s/foo/bar/g    replace all matches (`g` flag) of 'foo' with 'bar' on the current line only
:%s/foo/bar/g   replace all matches of 'foo' with 'bar' in the entire file (`:%s`)
:%s/foo/bar/gc  ask to manually confirm (`c` flag) each replacement 

# Preceding a motion or edition with a number repeats it 'n' times
# Examples:
50k         moves 50 lines up
2dw         deletes 2 words
5yy         copies 5 lines
42G         go to line 42

看完上面的东西我们就可以初步使用vim了，还需要去看文档？
如果你想看cheat现在支持什么命令你可以使用
cheat -l
来查看

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