37 个强大的 Linux shell 命令

jopen 11年前

要在Linux平台上工作,你无法避免使用shell命令来完成某些任务。 在这篇文章中,我们将分享37强大的Linux的shell命令。

  Task Commands
1 Delete file with 0 byte(empty file) find . -type f -size 0 -exec rm -rf {} \;
find . type f -size 0 -delete
2 Check process memory consumption ps -e -o "%C : %p : %z : %a"|sort -k5 -nr
3 Check process CPU utilizetion ps -e -o "%C : %p : %z : %a"|sort -nr
4 Print URLs in cache grep -r -a jpg /data/cache/* | strings | grep "http:" | awk -F'http:' '{print "http:"$2;}'
5 Check concurrent http connections and TCP connectio status netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
6 Replace no with yes in a line which contains Root in a file sed -i '/Root/s/no/yes/' /etc/ssh/sshd_config 
7 Kill mysql process ps aux |grep mysql |grep -v grep  |awk '{print $2}' |xargs kill -9
killall -TERM mysqld
kill -9 `cat /usr/local/apache2/logs/httpd.pid` 
8 List service in rc.d ls /etc/rc3.d/S* |cut -c 15- 
9 Display multiline information with EOF cat << EOF
+--------------------------------------------------------------+
|   === Welcome to Tunoff services ===                         |
+--------------------------------------------------------------+
EOF
10 Use of for loop cd /usr/local/mysql/bin
for i in *
do ln /usr/local/mysql/bin/$i /usr/bin/$i
done
11 Get IP address 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 Memory size free -m |grep "Mem" | awk '{print $2}'
13 Check connections to port 80 netstat -an -t | grep ":80" | grep ESTABLISHED | awk '{printf "%s %s\n",$5,$6}' | sort
14 Check concurrent connections and TCP connection status to Apache netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
15 Check all jpg file size find / -name *.jpg -exec wc -c {} \;|awk '{print $1}'|awk '{a+=$1}END{print a}'
16 CPU number cat /proc/cpuinfo |grep -c processor
17 CPU load cat /proc/loadavg
18 CPU load mpstat 1 1
19 Memory space free
20 Disk usage df -h
21 Find files and directories taking most space in a disk space du -cks * | sort -rn | head -n 10
22 Disk I/O load iostat -x 1 2
23 Network load sar -n DEV
24 Network error netstat -i
cat /proc/net/dev
25 Network connection number netstat -an | grep -E “^(tcp)” | cut -c 68- | sort | uniq -c | sort -n
26 Total process number ps aux | wc -l
27 Check process tree ps aufx
28 Number of runnable processes vmwtat 1 5
29 Check whether a DNS server works properly dig www.baidu.com @61.139.2.69
30 Check number of users logged in currently who | wc -l
31 Check and search log 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 Kernel log dmesg
33 Time date
34 Opened handles lsof | wc -l
35 Capture network package tcpdump -c 10000 -i eth0 -n dst port 80 > /root/pkts
36 Check repetitions of IP and print it with lowest to largest order 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 to check network adaptor type kudzu --probe --class=network

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