# 1、学习链接
* [Linux / Unix入门教程：7天内在线学习](https://www.guru99.com/unix-linux-tutorial.html)
* [所有命令](https://www.commandlinefu.com/commands/browse)
* [linux-cmd](https://wangchujiang.com/linux-command/hot.html)
* [命令行的艺术](https://github.com/jlevy/the-art-of-command-line/blob/master/README-zh.md)
* [程序猿成长计划](https://github.com/mylxsw/growing-up)
* [learn-c-the-hard-way-lectures](https://github.com/zedshaw/learn-c-the-hard-way-lectures)
* [linux 调优](https://xwl-note.readthedocs.io/en/latest/linux/tuning.html)
* [The Linux man-pages project](https://www.kernel.org/doc/man-pages/)
* [man7](http://man7.org/index.html)
* [TLDR pages](https://tldr.sh/)
* [An A-Z Index of the Linux command line: bash + utilities.](https://ss64.com/bash/)
* [Arch manual pages](https://jlk.fjfi.cvut.cz/arch/manpages/)
* https://explainshell.com/
* https://huataihuang.gitbooks.io/cloud-atlas/content/
* https://github.com/judasn/Linux-Tutorial
* https://docs.linux-code.com/
* https://www.kancloud.cn/devops-centos/
* https://gitee.com/linjialiang/full-stack-developer/
* https://wizardforcel.gitbooks.io/llthw/content/
* https://wiki.archlinux.org


# 2、Linux tuning
```bash
ulimit -a
# 使用netstat 命令查看连接数
netstat -n | awk '/^tcp/ {++state[$NF]} END {for(key in state) print key,"t",state[key]}'
# 查看网络状态
sar -n DEV 1
# 查看IO状态
iostat 1
# 查看cpu状态
mpstat -P ALL
# 查看22端口链接
ss -lntup |grep 22
ss -tunl | grep 6443
netstat -lntup |grep 22
# 查找文件
find *.md | xargs grep -ri "ch"
```
# 3、命令
```bash
tmux
screen
tree
dirs
pushd
popd
locate
iftop
percol
fasd
sed
awk
perl
htop
grep
awk
sed
cat
find
which
xargs
lsof
netstat
iotop
iftop
apg
`locate / | fzf -m`
fish
ag
cloc
dtrx
aunpack
less
sdcv
httpie
jq
expect
traceroute -> mtr / mtr-tiny
top -> htop
tmux -> byobu
sysvinit -> systemd 
bash -> zsh + oh-my-zsh 
cd -> popd
apt-get -> aptitude
scp -> rsync
grep - > ack
ncdu - > du
ls - >exa
watch -n 1 -d netstat -lnp
df - > pydf
net-tools - > iproute2
iptables - > nftables
{i，} python - > ptipython
df - > dfc
```