37 Common Linux shell command combinations

Serial number	Task	Command combination
1	Delete a 0-byte file	Find. -type f-size 0-exec rm-rf {} \; Find. Type F-size 0-delete
2	View processes, sorted by memory from large to small	PS-E-O "%c:%p:%z:%a" |sort-k5-nr
3	Rank from large to small by CPU utilization	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: ' $ ';} '
5	View the number of concurrent requests for HTTP and their TCP connection status	Netstat-n | awk '/^tcp/{++s[$NF]} END {for (a in S) print A, s[a]} '
6	Sed the root line in this article, matching the root line, replacing 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 $} ' |xargs kill-9 Killall-term mysqld Kill-9 ' Cat/usr/local/apache2/logs/httpd.pid '
8	Show services running Level 3 (learn about the cut's purpose, intercept data)	ls/etc/rc3.d/s* |cut-c 15-
9	How to display multiple messages in the writing shell, with EOF	Cat << EOF + ———————————————————— –+ | = = = Welcome to tunoff services = = = | + ———————————————————— –+ Eof
10	for use (e.g. to build a soft link to MySQL)	Cd/usr/local/mysql/bin For i in * Do ln/usr/local/mysql/bin/$i/usr/bin/$i Done
11	Take IP Address	Ifconfig eth0 |grep "inet addr:" |awk ' {print $} ' |cut-c 6- Ifconfig | grep ' inet addr: ' | Grep-v ' 127.0.0.1′|cut-d:-f2 | awk ' {print '} '
12	The size of the memory	Free-m |grep "Mem" | awk ' {print $} '
13	View 80-port connections and sort	netstat-an-t | grep ": 80″| grep established | awk ' {printf '%s%s\n ", $5,$6} ' | Sort
14	View the number of concurrent requests for Apache and its TCP connection status	Netstat-n | awk '/^tcp/{++s[$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 $} ' |awk ' {A+=$1}end{print A} '
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
21st	If a partition space is found to be nearly exhausted, you can go to the mount point of the partition and use the command to find the file or directory that occupies the most 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	Number of network Connections	Netstat-an | Grep-e "^ (TCP)" | Cut-c 68-| Sort | uniq-c | Sort-n
26	Total number of processes	PS aux | Wc-l
27	View Process Tree	PS AUFX
28	Number of processes that can run	Vmwtat 1 5
29	Check if DNS server is working properly, take 61.139.2.69 as an example	Dig www.baidu.com @61.139.2.69
30	Check the number of currently logged in users	W.H.O. | Wc-l
31	Log view, search	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 handles already open	lsof | Wc-l
35	Network capture packet, direct output summary information to the file.	Tcpdump-c 10000-i eth0-n DST port >/root/pkts
36	Then check the number of repetitions of the IP and order from small to large note "-t\ +0″ the middle is two spaces, less command usage."	Less Pkts | awk {' printf $3″\n '} | Cut-d.-F 1-4 | Sort | uniq-c | awk {' printf $1″ ' $2″\n "'} | Sort-n-t\ +0
	kudzu View network card model	kudzu–probe–class=network