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Disk Related Commands

# Find disk usage by partition in a human readable format
$ df -h

# Find the top 100 space eating monster file/dir under a directory
$ du -a [dir] | sort -n | tail -100

Security Related Commands

# Find out what files a logged in user has opened (ignoring libs, devices, sockets, pipes)
$ lsof | grep [username] | egrep -v '(lib|/dev|pipe)'

# Find which process is connected to what port and which remote host
$ netstat -pat

Network Related Commands

# Find the NIC speed
$ mii-tool

File/Dir Commands

# Move all files with specific pattern to a sub-directory which might already have files with same pattern
$ find . -maxdepth 1 -name "*2008*.txt" -exec mv {} 2008 \;

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