请问 如何linux 垃圾文件清理、

请问 如何linux 垃圾文件清理、
我清理了/tmp 目录下的所有文件 才腾出来了29m 真晕了
谁能帮帮我
Filesystem Type 容量 已用 可用 已用% 挂载点
/dev/sda3 ext3 4.6G 4.4G 29M 100% /
none proc 0 0 0 - /proc
none sysfs 0 0 0 - /sys
none devpts 0 0 0 - /dev/pts
/dev/sda1 ext3 99M 12M 82M 13% /boot
none tmpfs 125M 0 125M 0% /dev/shm
none binfmt_misc 0 0 0 - /proc/sys/fs/binfmt_misc
sunrpc rpc_pipefs 0 0 0 - /var/lib/nfs/rpc_pipefs
[root@www /]# du -h /var/log
8.0K /var/log/iiim
8.0K /var/log/vbox
8.0K /var/log/amanda
8.0K /var/log/samba
480K /var/log/httpd
8.0K /var/log/quagga
8.0K /var/log/radius/radacct
52K /var/log/radius
24K /var/log/gdm
8.0K /var/log/ppp
44K /var/log/cups
8.0K /var/log/squid
16K /var/log/mail
8.0K /var/log/audit
88M /var/log
[root@www /]# du -h /tmp
12K /tmp/.font-unix
8.0K /tmp/.ICE-unix
28K /tmp
[root@www /]#