常用linux shell命令组合

[ 2014-07-27 23:13:42 | Author: zhenhua ]
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任务  命令组合
1  删除0字节文件  find . -type f -size 0 -exec rm -rf {} \;
find . type f -size 0 -delete
2  查看进程,按内存从大到小排列  ps -e -o "%C : %p : %z : %a"|sort -k5 -nr
3  按cpu利用率从大到小排列  ps -e -o "%C : %p : %z : %a"|sort -nr
4  打印说cache里的URL  grep -r -a jpg /data/cache/* | strings | grep "http:" | awk -F'http:' '{print "http:"$2;}'
5  查看http的并发请求数及其TCP连接状态  netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
6  sed在这个文里Root的一行,匹配Root一行,将no替换成yes。  sed -i '/Root/s/no/yes/' /etc/ssh/sshd_config
7  如何杀掉mysql进程  ps aux |grep mysql |grep -v grep |awk '{print $2}' |xargs kill -9
killall -TERM mysqld
kill -9 `cat /usr/local/apache2/logs/httpd.pid`
8  显示运行3级别开启的服务(从中了解到cut的用途,截取数据)  ls /etc/rc3.d/S* |cut -c 15-
9  如何在编写SHELL显示多个信息,用EOF  cat << EOF
+--------------------------------------------------------------+
| === Welcome to Tunoff services === |
+--------------------------------------------------------------+
EOF
10  for的用法(如给mysql建软链接)  cd /usr/local/mysql/bin
for i in *
do ln /usr/local/mysql/bin/$i /usr/bin/$i
done
11  取IP地址  ifconfig eth0 |grep "inet addr:" |awk '{print $2}'|cut -c 6-
ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' |cut -d: -f2 | awk '{ print $1}'
12  内存的大小  free -m |grep "Mem" | awk '{print $2}'
13  查看80端口的连接,并排序  netstat -an -t | grep ":80" | grep ESTABLISHED | awk '{printf "%s %s\n",$5,$6}' | sort
14  查看Apache的并发请求数及其TCP连接状态  netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
15  统计一下服务器下面所有的jpg的文件的大小  find / -name *.jpg -exec wc -c {} \;|awk '{print $1}'|awk '{a+=$1}END{print a}'
16  CPU的数量  cat /proc/cpuinfo |grep -c processor
17  CPU负载   cat /proc/loadavg
18  CPU负载   mpstat 1 1
19  内存空间   free
20  磁盘空间   df -h
21  如发现某个分区空间接近用尽,可以进入该分区的挂载点,用以下命令找出占用空间最多的文件或目录  du -cks * | sort -rn | head -n 10
22  磁盘I/O负载   iostat -x 1 2
23  网络负载   sar -n DEV
24  网络错误   netstat -i
cat /proc/net/dev
25  网络连接数目  netstat -an | grep -E “^(tcp)” | cut -c 68- | sort | uniq -c | sort -n
26  进程总数  ps aux | wc -l
27  查看进程树  ps aufx
28  可运行进程数目  vmwtat 1 5
29  检查DNS Server工作是否正常,这里以61.139.2.69为例  dig www.baidu.com @61.139.2.69
30  检查当前登录的用户个数  who | wc -l
31  日志查看、搜索  cat /var/log/rflogview/*errors
grep -i error /var/log/messages
grep -i fail /var/log/messages
tail -f -n 2000 /var/log/messages
32  内核日志  dmesg
33  时间  date
34  已经打开的句柄数  lsof | wc -l
35  网络抓包,直接输出摘要信息到文件。  tcpdump -c 10000 -i eth0 -n dst port 80 > /root/pkts
36  然后检查IP的重复数 并从小到大排序 注意 "-t\ +0" 中间是两个空格,less命令的用法。  less pkts | awk {'printf $3"\n"'} | cut -d. -f 1-4 | sort | uniq -c | awk {'printf $1" "$2"\n"'} | sort -n -t\ +0
37  kudzu查看网卡型号  kudzu --probe --class=network
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