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Useful Commands (view source)

Revision as of 17:22, 25 April 2013

4,087 bytes added ,  17:22, 25 April 2013
→‎MySQL
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  /etc/init.d/httpd restart
 
  /etc/init.d/httpd restart
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==Command-Line Quick Reference Guide==
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Below is a list of commands that I use all the time & tend to forget.
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===Generic Linux===
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{| class="wikitable"
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|-
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! COMMAND NAME !! DESCRIPTION
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|-
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| df -h || shows disk usage in human readable form
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|-
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| man <commandname> || shows more info about a command
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|-
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| uname -a || kernel release version
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|-
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| /usr/sbin/smbd -V || samba version
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|-
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| /usr/sbin/httpd -v || apache version
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|-
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| mysql -v || mysql version
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|-
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| php -v ||  php version
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|-
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| mv || moves or renames a file
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|-
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| cp || copies or backup a file
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|-
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| rm || removes or deletes a file
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|-
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| ps -aux|grep <process> || outputs processes running <process>
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|-
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| ps -AH || report process status
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|-
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| top || shows processes
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|-
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| top -i ||  shows only active processes
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|-
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|  htop  || shows processes (more versatile than top)
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|-
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| iptraf || shows network info
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|-
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| mc -d  || show midnight commander (cli file browser) to navigate through system easily
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|-
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| cat /proc/mdstat || shows software raid
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|-
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|  host -t mx aol.com || shows the mx records for aol.com
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|-
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| net groupmap list || shows samba mappings to nt groups
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|-
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| telinit 1 || changes to single user mode
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|-
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| ifconfig || shows detailed info on ethernet ports
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|-
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| grep -r "casesensitivesearch" * || finds all documents containing the criteria in a dir
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|-
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| tail -f /var/log/<LOGFILE> || realtime viewing of your log file
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|-
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| hdparm -Tt /dev/mdx (where x is 0,1,2,etc) || shows software raid performance
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|-
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| mdadm --detail /dev/mdx (where x is 0,1,2,etc) || gives raid info
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|-
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| tar -czvf foo.tar.gz foo || creates a tar/zip file of a directory
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|-
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| tar -xvzf foo.tar.gz || untar/unzip a tar/zip file
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|-
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| scp -P <ssh_portnumber> foo.tar.gz <user>@<other_server_ipaddress>:/opt || transfers file to another server in /opt directory
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|-
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| rsync --progress -te "ssh -p <ssh_portnumber>" foo <other_server_ipaddress>:/opt  || transfers file to another server
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|-
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| sed -i s/foo/fee/g <FILENAMEORPATHTODIR> || replaces foo with fee
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|}
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Estimate file space usage - drill down into directories
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cd /
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du --si --max-depth 1
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cd /home
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du --si --max-depth 1
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cd /home/e-smith
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du --si --max-depth 1
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===RPM's===
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{| class="wikitable"
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|-
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! Command !! Explanation
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|-
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| rpm -qa || shows all rpms installed
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|-
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| rpm -qa --last || shows all rpms installed & installation date
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|-
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| rpm -q  || asks for rpm info
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|-
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| rpm -qi  || asks for detailed rpm info
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|-
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| rpm -ql <packagename> || lists all files in a package
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|-
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| rpm -qf <filename> || reports what package a file belongs to
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|}
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===YUM'ing and repositories===
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{| class="wikitable"
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|-
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! Command !! Explanation
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|-
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| yum install <packagename> || installs packagename & any package it may need
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|-
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| yum remove <packagename> || removes packagename
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|-
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| yum list updates || list updates to any installed package
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|-
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| yum list available || list available packages in all repos not already installed
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|-
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| yum list available |grep <reponame> || list available packages -shows only from repo name
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|-
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| yum search <packagename>  || lists all packages in all repos matching packagename
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|-
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| yum clean all || Is used to clean up various things which accumulate in  the  yum cache
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|-
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| yum --enablerepo=<reponame> <command> || enables a repo not normally enabled
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|-
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|  /sbin/e-smith/audittools/newrpms || shows all extra packages installed
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|-
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| /sbin/e-smith/audittools/repositories || show all repositories and if they are activated or not
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|-
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| db yum_repositories show <reponame> || show properties of the repository <reponame> '''(you may use TAB to auto-complete your command line)'''
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|}
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====Restoring Default Yum Repositories====
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{{note box|If you have problems with your yum setup you may have entered incorrect repository values. Remove the current values and restore the original setting with these commands}}
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cd /home/e-smith/db/
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mv yum_repositories yum_repositories.po
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/etc/e-smith/events/actions/initialize-default-databases
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Now you have a clean install, you can re-add 3rd party repos as described above
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signal-event yum-modify
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and check if you can update your server
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yum update
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==MySQL==
 
==MySQL==
Retrieved from "https://wiki.koozali.org/Special:MobileDiff/19793"

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