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Useful when you forget to use sudo for a command. "!!" grabs the last run command.

Really useful for when you have a typo in a previous command. Also, arguments default to empty so if you accidentally run: echo "no typozs" you can correct it with ^z

Next time you are using your shell, try typing ctrl-x e (that is holding control key press x and then e). The shell will take what you've written on the command line thus far and paste it into the editor specified by $EDITOR. Then you can edit at leisure using all the powerful macros and commands of vi, emacs, nano, or whatever. Show Sample Output

When typing out long arguments, such as: cp file.txt /var/www/wp-content/uploads/2009/03/ You can put that argument on your command line by holding down the ALT key and pressing the period '.' or by pressing <ESC> then the period '.'. For example: cd 'ALT+.' would put '/var/www/wp-content/uploads/2009/03/ as my argument. Keeping pressing 'ALT+.' to cycle through arguments of your commands starting from most recent to oldest. This can save a ton of typing.

Particularly useful if you're mounting different drives, using the following command will allow you to see all the filesystems currently mounted on your computer and their respective specs with the added benefit of nice formatting. Show Sample Output

curl ifconfig.me/ip -> IP Adress curl ifconfig.me/host -> Remote Host curl ifconfig.me/ua ->User Agent curl ifconfig.me/port -> Port thonks to http://ifconfig.me/

This is an alternative to cron which allows a one-off task to be scheduled for a certain time.

This will output the sound from your microphone port to the ssh target computer's speaker port. The sound quality is very bad, so you will hear a lot of hissing.

Example : vim /etc/fstab ## damn <ctrl+u> sudo <ctrl+y> ## like a boss. Example 2 : sudo vim /root/bin/ ##uh... autocomplete doesn't work... <ctrl+u> sudo ls /root/bin ##ah! that's the name of the file! <ctrl+y> sudo vim /root/bin/ ##resume here! Thanks readline!

Query Wikipedia by issuing a DNS query for a TXT record. The TXT record will also include a short URL to the complete corresponding Wikipedia entry.You can also write a little shell script like: $ cat wikisole.sh #!/bin/sh dig +short txt ${1}.wp.dg.cx and run it like ./wikisole.sh unix were your first option ($1) will be used as search term. Show Sample Output

Makes a partition in ram which is useful if you need a temporary working space as read/write access is fast. Be aware that anything saved in this partition will be gone after your computer is turned off.

-p parameter tells wget to include all files, including images. -e robots=off you don't want wget to obey by the robots.txt file -U mozilla as your browsers identity. --random-wait to let wget chose a random number of seconds to wait, avoid get into black list. Other Useful wget Parameters: --limit-rate=20k limits the rate at which it downloads files. -b continues wget after logging out. -o $HOME/wget_log.txt logs the output

Useful for checking if there are differences between local and remote files.

Unreachable_host is unavailable from local network, but it's available from reachable_host's network. This command creates a connection to unreachable_host through "hidden" connection to reachable_host.

time read -sn1 (s:silent, n:number of characters. Press any character to stop)

A nice way to use the console in full screen without forget the current time. you can too add other infos like cpu and mem use. Show Sample Output

Using +F will put less in follow mode. This works similar to 'tail -f'. To stop scrolling, use the interrupt. Then you'll get the normal benefits of less (scroll, etc.). Pressing SHIFT-F will resume the 'tailling'.