#!/bin/bash

function bksys() {
    filename=`date --date="-24 hour" +%Y-%m-%d_%H-%M`;
    tar cvpzf /kelu/Backup/$filename.tar.gz --exclude=/proc --exclude=/tmp --exclude=/lost+found --exclude=/mnt --exclude=/sys --exclude=/kelu/Backup/ --exclude=/pub /;
}

bksys 2>&1 | tee -a /var/log/bksys.log

YUKI.N> cat rsyncd.motd
+++++++++++++++++++++++++++
+     kelu.org  2015      +
+++++++++++++++++++++++++++
YUKI.N> cat rsyncd.password
12345678
YUKI.N> cat rsyncd.secrets
kelu:12345678

# Distributed under the terms of the GNU General Public License v2
# Minimal configuration file for rsync daemon
# See rsync(1) and rsyncd.conf(5) man pages for help

# This line is required by the /etc/init.d/rsyncd script
pid file = /var/run/rsyncd.pid
port = 873
# 你的IP地址！
address = 12.34.56.78 
#uid = nobody
#gid = nobody
uid = kelu
gid = kelu

use chkelu = yes
read only = yes

#limit access to private LANs 注意要把自己的IP添加进去！
hosts allow=192.168.1.0/255.255.255.0 10.0.1.0/255.255.255.0 
hosts deny=*

max connections = 5
# motd文件，欢迎语来着，在里面随便写点东西。当用户登录时会看到这个信息。
motd file = /etc/rsyncd/rsyncd.motd

#This will give you a separate log file
log file = /var/log/rsync.log

#This will log every file transferred - up to 85,000+ per user, per sync
transfer logging = yes

log format = %t %a %m %f %b
syslog facility = local3
timeout = 300

# 模块定义啦
[模块名称]
path = /
list=yes
ignore errors
auth users = kelu
secrets file = /etc/rsyncd/rsyncd.secrets
comment = YUKI.N>
exclude = proc/ tmp/ lost+found/ mnt/ sys/ kelu/Backup/ pub/

/usr/bin/rsync --daemon 				# 启动服务
rsync --list-only kelu@kelu.org:: 		# 备份信息
rsync -avzP kelu@kelu.org::kelu.org /kelu/Dropbox/kelu.org/
										# 备份

#!/bin/sh
# /usr/bin/rsync --daemon;
# 全量备份
# rsync -avzP --password-file=/etc/rsyncd/rsyncd.secrets kelu@kelu.org::kelu.org /kelu/Dropbox/kelu.org/$(date + '%m-%d-%y')
rsync -avzP --password-file=/etc/rsyncd/rsyncd.password kelu@kelu.org::kelu.org /kelu/Dropbox/kelu.org/											

crontab -e

# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.

# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/

40 2 * * * rsync -avzP --password-file=/etc/rsyncd/rsyncd.password kelu@kelu.org::kelu.org /kelu/Dropbox/kelu.org/

10 4 * * * /usr/bin/run-parts   /etc/cron.daily.kelu    1> /dev/null

$ apt-get install git
$ git config --global user.name "YOUR NAME"
$ git config --global user.email "YOUR EMAIL ADDRESS"
$ ssh-keygen -t rsa -C "YOUR EMAIL ADDRESS"

$ ssh-agent bash
$ ssh-agent -s
$ ssh-add ~/.ssh/id_rsa
$ ssh -T git@github.com

Hi username! You've successfully authenticated, but GitHub does not # provide shell access.

$ git clone git@github.com:YOUR NAME/PROJECT.github.com.git

chroot=$1
...
rm -rf $chroot/usr/share/doc

david% bash /tmp/shrink-chroot.sh
$chroot=
david% bash -u /tmp/shrink-chroot.sh
/tmp/shrink-chroot.sh: line 3: $1: unbound variable
david%

command
if [ "$?"-ne 0]; then echo "command failed"; exit 1; fi 可以替换成：

command || { echo "command failed"; exit 1; }

if ! command; then echo "command failed"; exit 1; fi

set +e
command1
command2
set -e

if [ $filename = "foo" ];

if [ "$filename" = "foo" ];

david% foo() { for i in $@; do echo $i; done }; foo bar "baz quux"
bar
baz
quux
david% foo() { for i in "$@"; do echo $i; done }; foo bar "baz quux"
bar
baz quux

david% touch "foo bar"
david% find | xargs ls
ls: ./foo: No such file or directory
ls: bar: No such file or directory
david% find -print0 | xargs -0 ls
./foo bar

trap command signal [signal ...]

if [ ! -e $lockfile ]; then
touch $lockfile
critical-section
rm $lockfile
else
echo "critical-section is already running"

fi 当最重要的部分(critical-section)正在运行时，如果杀死了脚本进程，会发生什么呢？锁文件会被扔在那，而且你的脚本在它被删除以前再也不会运行了。解决方法：

if [ ! -e $lockfile ]; then
trap " rm -f $lockfile; exit" INT TERM EXIT
touch $lockfile
critical-section
rm $lockfile
trap - INT TERM EXIT
else
echo "critical-section is already running"
fi

if ( set -o noclobber; echo "$$" > "$lockfile") 2> /dev/null;
then
trap 'rm -f "$lockfile"; exit $?' INT TERM EXIT
critical-section
rm -f "$lockfile"
trap - INT TERM EXIT
else
echo "Failed to acquire lockfile: $lockfile"
echo "held by $(cat $lockfile)"
fi

add_to_passwd $user
cp -a /etc/skel /home/$user
chown $user /home/$user -R

rollback() {
    del_from_passwd $user
        if [ -e /home/$user ]; then
            rm -rf /home/$user
        fi
        exit
}
trap rollback INT TERM EXIT
add_to_passwd $user
cp -a /etc/skel /home/$user
chown $user /home/$user -R
trap - INT TERM EXIT

for file in $(find /var/www -type f -name "*.html"); do
perl -pi -e 's/www.example.net/www.example.com/' $file
done

cp -a /var/www /var/www-tmp
for file in $(find /var/www-tmp -type -f -name "*.html"); do
perl -pi -e 's/www.example.net/www.example.com/' $file
done
mv /var/www /var/www-old
mv /var/www-tmp /var/www

	" ==========通用设置start================
	set encoding=utf-8
	set fileencodings=utf-8,shift-jis,cp936,latin1
	colo django " 主题配色
	set nocompatible " 关闭VI兼容模式
	set expandtab " 将tab扩展为空
	set mouse=a  " 开启鼠标模式
	set guifont=Monaco:h18 "字体
	set shiftwidth=4			" 设定 << 和 >> 命令移动时的宽度为 4
	set softtabstop=4		   " 使得按退格键时可以一次删掉 4 个空格
	set tabstop=4			   " 设定 tab 长度为 4
	set nobackup				" 覆盖文件时不备份
	set autochdir			   " 自动切换当前目录为当前文件所在的目录
	set backupcopy=yes		  " 设置备份时的行为为覆盖
	set ignorecase smartcase	" 搜索时忽略大小写，但在有一个或以上大写字母时仍大小写敏感
	set nowrapscan			  " 禁止在搜索到文件两端时重新搜索
	set incsearch			   " 输入搜索内容时就显示搜索结果
	set showmatch			   " 插入括号时，短暂地跳转到匹配的对应括号
	set matchtime=2			 " 短暂跳转到匹配括号的时间
	set magic				   " 显示括号配对情况
	set hidden				  " 允许在有未保存的修改时切换缓冲区，此时的修改由 vim 负责保存
	set nu " 显示行号
	set autochdir "自动切换工作目录
	syntax on " 语法高亮
	set so=4 " 设置光标距离上下边界的距离
	set ruler " 开启右下角光标位置显示
	set showcmd " 在窗口右下角显示完整命令已输入部分
	set cursorline " 高亮光标所在行
	set hlsearch " 搜索关键词高亮
	set cmdheight=2 " 设置命令行高度
	set foldenable			  " 开始折叠
	set foldmethod=syntax	   " 设置语法折叠
	set foldcolumn=0			" 设置折叠区域的宽度
	setlocal foldlevel=1		" 设置折叠层数为
	setlocal noswapfile " 关闭临时文件
	set wildmenu " 启用文本模式的菜单
	set guioptions-=m " 关闭菜单栏
	set guioptions-=T " 关闭工具栏
	set laststatus=2
	set statusline=YUKI.N>\ こんにちは\ %m%r\ %=
	set statusline+=\ %{&ff}\ %Y\ 0x%02.2B
	set statusline+=\ %-21(%11(%l/%L%),%-3v\ %P%)
	"set smartindent			 " 开启新行时使用智能自动缩进
	"set cindent
	" set nowrap				  " 不自动换行
	"set autoindent
	" set textwidth=76		  " 自动换行
	" ==========通用设置end================
	" ==========Plugin start================
	filetype plugin indent on   " 开启插件
	" filetype on 命令打开文件类型检测功能
	" filetype plugin on 允许vim加载文件类型插件。
	" filetype indent on 允许vim为不同类型的文件定义不同的缩进格式。可继续设置
	"
	set completeopt=longest,menu " 补全
	
	" 加速补全
	" supertab
	" 在输入变量名或路径名等符号中途按Tab键，得到以前输入过的符号列表，并通过Tab键循环选择。
	"0 - 不记录上次的补全方式
	"1 - 记住上次的补全方式,直到用其他的补全命令改变它
	"2 - 记住上次的补全方式,直到按ESC退出插入模式为止
	let g:SuperTabRetainCompletionType=2
	let g:SuperTabDefaultCompletionType=""
	"
	" vim配置及自动补全插件neocomplcache
	" 使用缓存，自动补全时效率高、生成的关键词列表准确等优点。
	let g:neocomplcache_enable_at_startup=1
	
	" Remove trailing whitespace when writing a buffer, but not for diff files.
	" 自动去除无效空白，包括行尾和文件尾
	" @see http://blog.bs2.to/post/EdwardLee/17961
	function RemoveTrailingWhitespace()
	 if &ft != "diff"
	  let b:curcol = col(".")
	  let b:curline = line(".")
	  silent! %s/\s\+$//
	  silent! %s/\(\s*\n\)\+\%$//
	  call cursor(b:curline, b:curcol)
	 endif
	endfunction
	autocmd BufWritePre * call RemoveTrailingWhitespace()