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Remount root in read-write mode.
Saved my day, when my harddrive got stuck in read-only mode.

See OpenVZ Container id's of top 10 running processes by %cpu
This command will list the PID, VEID, and Name of the 10 highest cpu using processes on a openvz host. You must have vzpid installed.

TCP and UDP listening sockets
This command show listening sockets TCP and UDP. Useful for stop unwanted services from linux.

for ssh uptime
This will run them at the same time and timeout for each host in ten seconds. Also, mussh will append the ip addres to the beginning of the output so you know which host resonded with which time. The use of the sequence expression {1..50} is not specific to mussh. The `seq ...` works, but is less efficient.

Scan all open ports without any required program

dont execute command just add it to history as a comment, handy if your command is not "complete" yet

send DD a signal to print its progress
every 1sec sends DD the USR1 signal which causes DD to print its progress.

find directory with most inodes/files
Find which directory in one filesystem that contains most inodes or files.

A DESTRUCTIVE command to render a drive unbootable
Overwrites the boot sector. Since this doesn't overwrite any data, you can usually recover by re-creating the partition table exactly the same as before you zeroed it. This can also help sometimes if you install a new drive in a Windows machine which can't read it.

Copy files for backup storage
Backup a whole directory copying only updated files.


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