日常小技巧

# pip3 install -i https://pypi.douban.com/simple/ package

# vim ~/.pip/pip.conf 
[global] index-url = https://pypi.tuna.tsinghua.edu.cn/simple 

# sudo sed -i ‘s/us.archive.ubuntu.com/mirrors.ustc.edu.cn/g‘ /etc/apt/sources.list
# sudo sed -i ‘s/mirrors.ustc.edu.cn/us.archive.ubuntu.com/g‘ /etc/apt/sources.list

# date -d "1970-01-01 UTC `echo "$(date +%s)-$(cat /proc/uptime|cut -f 1 -d‘ ‘)+202077.293542"|bc ` seconds"

# sudo tcpdump -i p2p1 -w ./1.pcap host 172.16.xx.144

:%s/字符串/&/gn          # 统计字符串出现的次数

:set ignorecase         # 不区分大小写（命令行模式）
:set noignorecase       # 区分大小写（命令行模式）

:set paste    # 命令行模式下输入命令

# du -sh webrtc/
# du -sh * |sort -h       # 按大小排序

# grep -o ‘[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}‘ file.txt
# grep -E -o ‘(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)‘ file.txt

# sed -n ‘200,300p‘ 172.16-ips.txt > 100.txt

# sed -e ‘s/$/\r/‘ 10-vul.txt > 10-vuls.txt

# wget -m -p -E -k -K -np -v http://www.baidu.com

# id 2>&1 |tee 12.txt
# id 1 |tee 1.txt

# curl -I -X OPTIONS http://what-site/

# find ./ -type d -name ‘.git‘    # 找出
# find ./ -type d -name ‘.git‘ -exec rm -rf {} \;    # 找出并删除

# find . -name *.wav -exec du -sh {} \; | sort -h

# find ./ -type f -size +102400k
# find ./ -type f -size +102400k -exec du -sh {} \;

如查找后缀为txt|ini|php的文件
# find ./ -regex ".*\.yuv"
# find ./ -regex ".*\.wav\|.*\.yuv"
# find ./ -regex ".*\.txt\|.*\.ini\|.*\.php" -exec rm -rf * {} \;

# ls -lR | grep "^-"| wc -l
# webrtc-linux/src# ls -lR | grep "^-"| wc -l

# find .  -name *.pyc -exec rm -rf {} \;

![image](https:///xxx.png)

# ls -l | awk ‘{print $9}‘

# groups            # 简单列表
# cat /etc/group    # 可以看到组里用哪些用户

Ubuntu/Debian
# apt-get install build-essential
RedHat/CentOS
# yum group install "Development Tools"