How can I clean linux junk files,

How can I clean up linux spam and choose Linux Enterprise Application> Linux server application? For more information, see the following. How can I clean linux junk files,
I cleared all the files in the/tmp directory to free up the space. 29 m is truly dizzy.
Who can help me?
Filesystem Type capacity in use available % mount point
/Dev/sda3 ext3 4.6G 4.4G 29 M 100%/
None proc 0 0-/proc
None sysfs 0 0 0-/sys
None devpts 0 0 0-/dev/pts
/Dev/sda1 ext3 99 M 12 M 82 M 13%/boot
None tmpfs 125 M 0 125 M 0%/dev/shm
None binfmt_misc 0 0-/proc/sys/fs/binfmt_misc
Sunrpc rpc_pipefs 0 0 0-/var/lib/nfs/rpc_pipefs
[Root @ www/] # du-h/var/log
8.0 K/var/log/iiim
8.0 K/var/log/vbox
8.0 K/var/log/amanda
8.0 K/var/log/samba
480 K/var/log/httpd
8.0 K/var/log/quagga
8.0 K/var/log/radius/radacct
52 K/var/log/radius
24 K/var/log/TPD
8.0 K/var/log/ppp
44 K/var/log/cups
8.0 K/var/log/squid
16 K/var/log/mail
8.0 K/var/log/audit
88 M/var/log
[Root @ www/] # du-h/tmp
12 K/tmp/. font-unix
8.0 K/tmp/. ICE-unix
28 K/tmp
[Root @ www/] #