General Linux Common Command

Generic Linux

COMMAND NAME		DESCRIPTION
df -h                   shows disk usage in human readable form
man <commandname>       shows more info about a command
uname -a		kernel release version
/usr/sbin/smbd -V	samba version
 /usr/sbin/httpd -v	apache version
mysql -v		mysql version
php -v		        php version
mv		        moves or renames a file
cp		        copies or backsup a file
rm		        removes or deletes a file
ps -ax|grep <process>	outputs processes running <process>
 ps -AH		        report process status
top		        shows processes
top -i                  shows only active processes
iptraf		        shows network info
mc -d                   show midnight commander to navigate through system easily
 cat /proc/mdstat	shows software raid
host -t mx aol.com	shows the mx records for aol.com
net groupmap list	shows samba mappings to nt groups
telinit 1		changes to single user mode
 ifconfig		shows detailed info on ethernet ports
grep -r "casesensitivesearch" *		finds all documents containing the criteria in a dir
tail -f /var/log/<LOGFILE>		realtime viewing of your log file
 hdparm -t /dev/mdx (where x is 0,1,2,etc)		shows software raid performance
mdadm --detail /dev/mdx (where x is 0,1,2,etc)		gives raid info
tar -czvf foo.tar.gz foo                               creates a tar/zip file of a directory
 tar -xvzf foo.tar.gz                                   untar/unzip a tar/zip file
scp -P <ssh_portnumber> foo.tar.gz <other_server_ipaddress>:/opt     transfers file to another server
rsync --progress -te "ssh -p <ssh_portnumber>" foo <other_server_ipaddress>:/opt     transfers file to another server
 sed -i s/foo/fee/g <FILENAMEORPATHTODIR>  replaces foo with fee