37 common Linux Shell Command combinations

Serial number	Task	Command combination
1	Delete 0-byte files	Find.-type f-size 0-exec rm-rf {}\; Find. type f-size 0-delete
2	View processes in a descending order of memory	Ps-e-o "% C: % p: % z: % a" | sort-k5-nr
3	Sort by cpu utilization from large to small	Ps-e-o "% C: % p: % z: % a" | sort-nr
4	Print the URL in the cache	Grep-r-a jpg/data/cache/* | strings | grep "http:" | awk-F 'HTTP: ''{print" http: "$2 ;}'
5	View the number of concurrent http requests and their TCP connection status	Netstat-n | awk '/^ tcp/{++ S [$ NF]} END {for (a in S) print a, S [a]}'
6	Sed matches the Root line in this text and replaces no with yes.	Sed-I '/Root/s/no/yes/'/etc/ssh/sshd_config
7	How to kill the mysql process	Ps aux | grep mysql | grep-v grep | awk '{print $2}' | xargs kill-9 Killall-TERM mysqld Kill-9 'cat/usr/local/apache2/logs/httpd. pid'
8	Display the services enabled at level 3 (learn the purpose of cut and intercept data)	Ls/etc/rc3.d/S * | cut-c 15-
9	How to display multiple information in a SHELL	Cat <EOF + --------------------- + | === Welcome to Tunoff services ===| + --------------------- + EOF
10	For usage (for example, creating a soft link to mysql)	Cd/usr/local/mysql/bin For I in * Do ln/usr/local/mysql/bin/$ I/usr/bin/$ I Done
11	IP address Retrieval	Ifconfig eth0 | grep "inet addr:" | awk '{print $2}' | cut-c 6- Ifconfig | grep 'inet addr: '| grep-v '2017. 0.0.1' | cut-d:-f2 | awk '{print $1 }'
12	Memory size	Free-m | grep "Mem" | awk '{print $2 }'
13	View and sort the connections on port 80	Netstat-an-t | grep ": 80" | grep ESTABLISHED | awk '{printf "% s \ n", $5, $6}' | sort
14	View the number of concurrent Apache requests and their TCP connection status	Netstat-n | awk '/^ tcp/{++ S [$ NF]} END {for (a in S) print a, S [a]}'
15	Count the size of all jpg files under the server	Find/-name *. jpg-exec wc-c {}\; | awk '{print $1}' | awk '{a + = $1} END {print }'
16	Number of CPUs	Cat/proc/cpuinfo | grep-c processor
17	CPU load	Cat/proc/loadavg
18	CPU load	Mpstat 1 1
19	Memory space	Free
20	Disk Space	Df-h
21	If a partition is found to be nearly exhausted, you can enter the mount point of the partition and use the following command to find the most occupied files or directories.	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	Number of Network Connections	Netstat-an | grep-E "^ (tcp)" | cut-c 68-| sort | uniq-c | sort-n
26	Process count	Ps aux | wc-l
27	View process tree	Ps aufx
28	Number of processes that can be run	Vmwtat 1 5
29	Check whether the DNS Server works normally. Here we use 61.139.2.69 as an example.	Dig www.baidu.com @ 61.139.2.69
30	Check the number of users currently logged on	Who | wc-l
31	View and search logs	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	Number of opened handles	Lsof | wc-l
35	Capture packets on the network and directly output the summary information to the file.	Tcpdump-c 10000-I eth0-n dst port 80>/root/pkts
36	Check the number of IP duplicates and sort them in ascending order. Note that there are two spaces in the middle of "-t \ + 0". usage of the less command.	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 view Nic Model	Kudzu-probe-class = network