1.显示消耗内存/CPU最多的10个进程 ps aux | sort -nk +4 | tail ps aux | sort -nk +3 | tail —————————————————————————————————————————— 2.查看Apache的并发请求数及其TCP连接状态 netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}’ —————————————————————————————————————————— 3.找出自己最常用的10条命令及使用次数(或求访问最多的ip数) sed -e ‘s/| /\n/g’ ~/.bash_history |cut -d ‘ ‘ -f 1 | sort | uniq -c | sort -nr | head —————————————————————————————————————————— 4.日志中第10个字段表示连接时间,求平均连接时间 cat access_log |grep “connect cbp” |awk ‘BEGIN{sum=0;count=0;}{sum+=$10;count++;}END{printf(“sum=%d,count=%d,avg=%f\n”,sum,count, sum/count)}’ —————————————————————————————————————————— 5.lsof命令 lsof abc.txt 显示开启文件abc.txt的进程 lsof -i :22 知道22端口现在运行什么程序 lsof -c abc 显示abc进程现在打开的文件 lsof -p 12 看进程号为12的进程打开了哪些文件 —————————————————————————————————————————— 6.杀掉一个程序的所有进程 pkill -9 httpd killall -9 httpd 注意尽量不用-9,数据库服务器上更不能轻易用kill,否则造成重要数据丢失后果将不堪设想。 —————————————————————————————————————————— 7.rsync命令(要求只同步某天的压缩文件,而且远程目录保持与本地目录一致) /usr/bin/rsync -azvR –password-file=/etc/rsync.secrets `find . -name “*$yesterday.gz” -type f ` storage@192.168.2.23::logbackup/13.21/ —————————————————————————————————————————— 8.把目录下*.sh文件改名为*.SH find . -name “*.sh” | sed ’s/\(.*\)\.sh/mv \0 \1.SH/’ |sh find . -name “*.sh” | sed ’s/\(.*\)\.sh/mv & \1.SH/’|sh (跟上面那个效果一样) —————————————————————————————————————————— 9.ssh执行远程的程序,并在本地显示 ssh -n -l zouyunhao 192.168.2.14 “ls -al /home/zouyunhao” —————————————————————————————————————————— 10. 直接用命令行修改密码 echo “zouyunhaoPassword” |passwd –stdin zouyunhao —————————————————————————————————————————— ssh-keygen ssh-copy-id -i ~/.ssh/id_rsa.pub user@remoteServer —————————————————————————————————————————— 12.以http方式共享当前文件夹的文件 $ python -m SimpleHTTPServer 在浏览器访问http://IP:8000/即可下载当前目录的文件。 —————————————————————————————————————————— 13.shell段注释 :<<’echo hello,world!’ —————————————————————————————————————————— 14.查看服务器序列号 dmidecode |grep “Serial Number” (查看机器其他硬件信息也可用这个命令) —————————————————————————————————————————— 15.查看网卡是否有网线物理连接 /sbin/mii-tool —————————————————————————————————————————— 16.查看linux系统或者mysql错误码表示的意思,如查看13错误码表示的意思: perror 13 —————————————————————————————————————————— 17.关于cpu个数 查看逻辑cpu个数:cat /proc/cpuinfo | grep “processor” | wc -l 查看物理cpu个数:cat /proc/cpuinfo | grep “physical id” | sort | uniq | wc -l 查看每个物理cpu的核数cores:cat /proc/cpuinfo | grep “cpu cores” 如果所有物理cpu的cores个数加起来小于逻辑cpu的个数,则该cpu使用了超线程技术。查看每个物理cpu中逻辑cpu的个数:cat /proc/cpuinfo | grep “siblings” —————————————————————————————————————————— 18.从格式不规范的日志中截取字符串 perl -ne ’print “$1\n” if /servletPath=(\S+)/g’ test.log —————————————————————————————————————————— 19. 把所有的文件名含有空格的,把空格去掉 find ./ -type f | while read line;do echo $line|grep -q " " && \mv "$line" $(echo $line|sed 's/ //g');done ------------------------------------------ 20.把所有的文件夹的文件名含有空格的,把空格去掉 find ./ -type d -name '*'|while read file; do echo $file|grep -q " " && mv "$file" $(echo $file|tr -d ' '); done 当文件名的末尾以空格结束时,就不能用命令行来实现,需要使用脚本: #!/bin/bash IFS=$'\n' find ./ -type f | while read line;do echo $line|grep -q " " && \mv "$line" $(echo $line|sed 's/ //g');done ------------------------------------------- 21.生成随机字符串: # tr -dc _A-Z-a-z#$%^*-0-9 </dev/urandom |head -c8 chgSh^eJ 或者 # mkpasswd -l 8 -d 1 -c 3 -C 2 -s 2 G_ze3Hto ------------------------------------------- 22.linux统计PCI插槽数量: [root@vcdog ~]# dmidecode |grep -1 PCI ISA is supported PCI is supported PC Card (PCMCIA) is supported -- System Slot Information Designation: PCI Slot J11 Type: 32-bit PCI Current Usage: In Use -- System Slot Information Designation: PCI Slot J12 Type: 32-bit PCI Current Usage: In Use -- System Slot Information Designation: PCI Slot J13 Type: 32-bit PCI Current Usage: In Use -- System Slot Information Designation: PCI Slot J14 Type: 32-bit PCI Current Usage: Available ---------------------------------------- 23. nmap探测远程主机的开放端口及操作系统: # nmap -A -T4 192.168.1.28 //此处可以为主机名,域名,或主机IP地址 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-12-28 09:46 CST Interesting ports on bogon (192.168.1.29): Not shown: 1677 closed ports PORT STATE SERVICE VERSION 135/tcp open msrpc Microsoft Windows RPC 139/tcp open netbios-ssn 445/tcp open microsoft-ds Microsoft Windows XP microsoft-ds MAC Address: 70:5A:B6:09:45:FA (Unknown) Device type: general purpose Running: Microsoft Windows NT/2K/XP OS details: Microsoft Widows XP SP2 Service Info: OS: Windows ------------------------------------ 24. linux下的文件去掉^M硬回车的方法: (1)# cat test.txt |tr -d '^M' >test.new (2).# sed -i 's/^M//g' test.txt (3)# dos2unix test.txt (4)在vi中用:%s/^M//g 注意:这里的“^M”要使用“CTRL-V CTRL-M”生成,而不是直接键入“^M”。 ------------------------------------- 25.删除文件中的所有空行: 1.使用awk方法如下: [root@dg ~]# cat t.txt | awk -F '' '{if($1!=null) print $0}' 203.208.46.146 www.google.com 223.208.46.146 www.google.com 203.208.46.147 www.google.com.hk 203.208.46.132 clients1.google.com 203.208.46.149 mail.google.com 2.sed方法如下: [root@dg ~]# sed '/^$/d' t.txt 203.208.46.146 www.google.com 223.208.46.146 www.google.com 203.208.46.147 www.google.com.hk 203.208.46.132 clients1.google.com 203.208.46.149 mail.google.com 203.208.46.161 chatenabled.mail.google.com 3.awk方法如下: [root@dg ~]# awk 'NF' t.txt 203.208.46.146 www.google.com 223.208.46.146 www.google.com 203.208.46.147 www.google.com.hk 203.208.46.132 clients1.google.com 203.208.46.149 mail.google.com 203.208.46.161 chatenabled.mail.google.com 4.vim中删除空行如下: :g/^$/d 203.208.46.146 www.google.com 223.208.46.146 www.google.com 203.208.46.147 www.google.com.hk 203.208.46.132 clients1.google.com 203.208.46.149 mail.google.com 203.208.46.161 chatenabled.mail.google.com ------------------------------------ 26.获取内存条TYPE和SPEED的信息: # dmidecode |grep -A 16 "Memory Device"|grep -E "Speed|Type" Type: DDR2 FB-DIMM Speed: 667 MHz (1.5 ns) Type: DDR2 FB-DIMM Speed: 667 MHz (1.5 ns) Type: DDR2 FB-DIMM Speed: 667 MHz (1.5 ns) Type: DDR2 FB-DIMM Speed: 667 MHz (1.5 ns) Type: DDR2 FB-DIMM Type: DDR2 FB-DIMM Type: DDR2 FB-DIMM Type: DDR2 FB-DIMM ================================================================= (不断更新中...)
转载于:https://blog.51cto.com/rainyang/1061744