Find and delete old files in Linux

Delete old files under Linux OS:

Command:
$ find /var/log -mtime +60 -type f -exec rm -rf {} \;

Description:
Command will delete files from directory /var/log which were last modified at least 60 days ago.

Source:
LinuxQuestions

Debian Linux updating problem

While I tried to update my Debian machine I encountered key signature problem:

# apt-get update
...
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B

Solution is easy:

# gpg --keyserver wwwkeys.eu.pgp.net --recv-keys 9AA38DCD55BE302B
# gpg --export --armour 9AA38DCD55BE302B | apt-key add -

Linux network top tool

Linux network top-like tool which shows per-process network usage:

# apt-get install nethogs

Linux network top tool

Linux network top-like tool which show per-process network usage:

apt-get install nethogs