linux运维常用命令

ps aux | sort -nk +4 | tail

Push your present working directory to a stack that you can pop later
pushd /tmp

Create a script of the last executed command
echo "!!" > foo.sh

Watch Network Service Activity in Real-time
lsof(list open files)是一个列出当前系统打开文件的工具。lsof -i显示符合条件的进程情况

lsof -i

Show apps that use internet connection at the moment. (Multi-Language)
显示当前用于互联网连接的应用程序

lsof -P -i -n

Reuse all parameter of the previous command line
重用前一个命令的所有参数；如：先使用ls查看文件是否存在，然后cat !*

!*

Add Password Protection to a file your editing in vim. vim
加密文件

vim -x

Display which distro is installed
显示系统是哪个发行版

cat /etc/issue

A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram
显示内存中的字符串

sudo dd if=/dev/mem | cat | strings

Graphical tree of sub-directories
子目录的图形树

ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'

intercept stdout/stderr of another process
拦截另一进程的 stdout/stderr

strace -ff -e trace=write -e write=1,2 -p SOME_PID

Copy a file using pv and watch its progress
拷贝文件，并实时显示进度、当前速度、耗费时间、估计剩余时间等。

pv sourcefile > destfile

Make directory including intermediate directories
创建目录，包括中间目录

mkdir -p a/long/directory/path

Multiple variable assignments from command output in BASH
bash命令输出的结果给多个变量赋值

read day month year <<< $(date +'%d %m %y')

Create a pdf version of a manpage
创建一个PDF

man -t strcpy | ps2pdf - filename.pdf

Show apps that use internet connection at the moment. (Multi-Language)

显示目前使用互联网连接的应用程序

ss -p

Graph # of connections for each hosts.
图形化显示当前机器连接了哪些IP，每个IP有多少个连接

netstat -an | grep ESTABLISHED | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | awk '{ printf("%s\t%s\t",$2,$1) ; for (i = 0; i < $1; i++) {printf("*")}; print "" }'

Job Control
作业控制

^Z $bg $disown

Edit a file on a remote host using vim
远程修改文件

vim scp://username@host//path/to/somefile

Record a screencast and convert it to an mpeg
录屏

ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/outputFile.mpg

Search for a string inside all files in the current directory
在当前目录中的所有文件中搜索字符串

grep -RnisI *

Convert seconds to human-readable format
时间戳转时间

date -d@1234567890

Get the 10 biggest files/folders for the current direcotry
获取当前目录中10个最大文件/文件夹

du -s * | sort -n | tail

Show numerical values for each of the 256 colors in bash
在bash中显示256种颜色和其值。

for code in {0..255}; do echo -e "\e[38;05;${code}m $code: Test"; done

Display a cool clock on your terminal
在你的终端上显示一个炫酷的时钟

watch -t -n1 "date +%T|figlet"

while true; do echo "$(date '+%D %T' | toilet -f term -F border --gay)"; sleep 1; done

Processor / memory bandwidthd? in GB/s
处理器/内存带宽？以GB/S表示

dd if=/dev/zero of=/dev/null bs=1M count=32768

Send pop-up notifications on Gnome
在gnome上发送弹出通知。

notify-send ["