rpm -ivh :installs
rpm -Uvh :Upgrade
rpm -ev :uninstall package
rpm -qa :list all installed packages
rpm -qi dsplay installed information along with package version
#zip and unzip
compress/uncompress
zip
gunzip
gzip
gunzip -c mydir.tar.gz | tar xvf -
tar -xvf .. extract
tar -zxvf ... for gz
tar -cxvf ... for bz
#find all logs with "error" keyword in it
find . -name "*.log" -exec grep -qi "error " '{}' \; -print
#sort 5 largest files
find . -ls |sort -nrk7| head -5
#find top process
ps axjf|grep <pid#>
#good for files recently (7 days) created and remove them
find . -name "*" -mtime -7 -exec rm {} \;
#more than 7 days. Good for older files deletions
find . -name "*" -mtime +7 -exec rm {} \;
#extend filesystem using extonline or resize2fs
lvextend -L +2000M /dev/VG00/lvora_backup
ext2online /dev/VG00/lvora_backup
or
resize2fs /dev/mapper/VolGroup00-LogVol00
