Insights on some basic commands in Linux (20 bases)

Find files containing AAA in all files in the current directory

ls |grep aaa ./*
Find the file named AA in the current path

find aa.*
Find the process currently occupying port 80

netstat -antpl |grep 80
View logs dynamically

tail -f 日志路径
tailf
ddos attack command

etstat -nut |awk '{print $5}' | cut -d: -f1 |sort|uniq -c|sort -n
Use awk to intercept the IP of the current server

ifconfig eth0 |grep netmask |awk '{print $2}'
Use AWK to intercept the ip of the current server and show it as IP: xxxx

ifconfig eth0 |grep netmask |awk '{print "ip:" $2}'
Look at line 64 of the passwd file

cat /etc/passwd|head -64|tail -1

sed -n ' 行数p'/etc/passwd
View a file and compress the continuous blank lines of the file into one line

cat -s 文件名
Query the line ending with abc in the txt file

grep abc$ txt

Delete blank lines in txt file

grep -v '^\s*$'  文件名     
sed '/^\s*$/d'文件名
sed -i '/^$/d' file.txt

Backup and restore the mysql database test library

备份：	mysqldump -u root -p test >备份路径
恢复：	mysql -u root -p test <文件路径

iptables prohibit 192.168.1.64 local access port 80
iptables -I INPUT -s 192.168.1.64 -p TCP --dport 80 -j ACCEPT
View the number of concurrent requests http
netstat -an | grep ESTABLISHED | wc -l
Find the ip most visited by Apache, the top 10
awk '{print $1}'日志文件名 |sort |uniq -c|sort-nr|head -行数
Statistics Number of files in / var / log directory
cat /var/log|wc -l
Taken Linux system, the network address of the machine, the format 172.168.1.200/255.255.255.0
ifconfig eth0 |grep netmask |awk '{print $2 "/" $4 }
View the current available memory
free
df -h
After entering mysql, reset the password

	在/etc/my.cnf中写入skip-grant-tables  用来跳过密码验证
    登入mysql
     update user set password=PASSWORD('xxx') where user='root';
    刷新权限
    flush privileges；
    去掉配置文件中的 skip，然后重启mysql 在使用账户和密码登录

Linux which support the power and resume function
isync

Insights on some basic commands in Linux (20 bases)

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