Very practical common Linux O & M commands and knowledge! 2

A collection of Common commands:

1. Search for all tar files and move them to the directory: Find. -name "*. tar "-exec MV {}. /backup/; 2. Search for I in 'Find. -name *. HTML | SED's /. // G' | SED's/html /. html/g''; do echo http: // 192.168.0.170: 8017 $ I; done

3. Remove the. character at the beginning of the line:
Find. -name *. HTML | SED's/^. // g'4. Find the file type and back up it to another directory: Find. -Name nginx. conf. tgz-exec CP {} DIR/; 5. Monitors Linux disk partitions. If the disk space exceeds 90%, send an email to Linux SA.
(1) print the root partition size
DF-H | sed-n' // $/P' | awk '{print $5}' | awk-F "%" '{print $1 }'
(2) The if condition determines whether the size is greater than 90. If the size is greater than 90, send an email alarm while sleep 5 m
Dofor I in 'df-H | sed-n' // $/P' | awk '{print $5}' | SED's/% // G''
Do
Echo $ IIF [$ I-GT 90]; then
Echo "more than 90% Linux of disk space, please Linux SA check Linux disk !" | Mail-s "Warn Linux/parts is $ I %" wugk@map.com
Fi
Done
Done6. Collect Apache access logs. The top 20 IP addresses are accessed: CAT access. log | awk '{print $1}' | sort | uniq-c | sort-Nr | head-207, add a http://img.map.com before all rows, and add/
Sed-E's/^/http://img.map.com/maplite/map/subway/1.1/'-E's/$ // 'a.txt
8. Find the current row and modify the parameters following the row:
Sed-I '/SELinux/S/disabled/enforcing/'/etc/SELinux/config
9. Find and modify the names of all folders in the directory:
Find.-Name "naviinfo.2010.12.0" | xargs rename naviinfo.2010.12.0 naviinfo.2010.12.1
10. view the number of Apache concurrent connections and related forwarding statuses:
Netstat-N | awk '/^ TCP/' | awk '{print $ NF}' | sort | uniq-c | sort-NR
Netstat-N | awk '/^ TCP/{++ s [$ NF]} end {for (a in S) print, s [a]} '11. Print the maximum and minimum values in a file:
Cat a.txt | sort-Nr | awk '{} end {print} Nr = 1 ′
Cat a.txt | sort-Nr | awk 'end {print} Nr = 1 ′
This is the true maximum and minimum values for printing: SED's // G' a.txt | sort-Nr | sed-N '1p; $ P' 12. Use snmpd to capture cacti data of version V2:
Snmpwalk-v2c-C public 192.168.0.241
13. Modify the text to replace JK with yz:
Sed-E's/JK $/YZ/G' B .txt
14. Network Packet Capture: tcpdump
Tcpdump-nn host 192.168.56.7 and port 80 capture packets 56.7 request through 80.
Tcpdump-nn host 192.168.56.7 or! Host 192.168.0.22 and port 80 exclude port 0.22 80!
TCP/IP Layer 7 protocol physical layer-data link layer-network layer-Transport Layer-Session Layer-presentation layer-application layer. 15. Configure group name for H3C: first, set the SNMP version as follows:
SNMP-Agent sys-Info version V1 v2c, and then set the group name: SNMP-Agent Community read public
16. display the 20 most commonly used commands:
Cat. bash_history | grep-V ^ # | awk '{print $1}' | sort | uniq-c | sort-Nr | head-20