All commands

expand to:

cp /work/host/phone/ui/main.cpp /work/target/phone/ui/main.cpp

!#

The entire command line typed so far.

Same as http://www.commandlinefu.com/commands/view/5876, but for bash.

This will show a numerical value for each of the 256 colors in bash. Everything in the command is a bash builtin, so it should run on any platform where bash is installed. Prints one color per line. If someone is interested in formatting the output, paste the alternative.

Create a binary clock.

-d: list directory entries instead of contents, and do not dereference symbolic links

Google just released a new commend line tool offering all sorts of new services from the commend line. One of them is uploading a youtube video but there are plenty more google services to interact with.

Download it here: http://code.google.com/p/googlecl/

Manual: http://code.google.com/p/googlecl/wiki/Manual

This specific command courtesy of lifehacker:http://lifehacker.com/5568817/

Though all can be found in manual page linked above.

The Linux kernel uses unused memory in caches. When you execute "free" you never get the "real" available memory.

Knock on ports to open a port to a service (ssh for example) and knock again to close the port. You have to install knockd.

See example config file below.

[options]

logfile = /var/log/knockd.log

[openSSH]

sequence = 3000,4000,5000

seq_timeout = 5

command = /sbin/iptables -A INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT

tcpflags = syn

[closeSSH]

sequence = 5000,4000,3000

seq_timeout = 5

command = /sbin/iptables -D INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT

tcpflags = syn

If you want a visual representation of the parent/child relationships between processes, this is one easy way to do it. It's useful in debugging collections of shell scripts, because it provides something like a call traceback.

When a shell script breaks, just remember "awwfux".

Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

Probably only works with GNU du and modern perls.

This recursively downloads all images from a given website to your /tmp directory. The -nH and -nd switches disable downloading of the directory structure.

Tee can be used to split a pipe into multiple streams for one or more process to work it. You can add more " >()" for even more fun.

Short command, easy to remember

I have a bash alias for this command line and find it useful for searching C code for error messages.

The -H tells grep to print the filename. you can omit the -i to match the case exactly or keep the -i for case-insensitive matching.

This find command find all .c and .h files

Blacklisted is a compiled list of all known dirty hosts (botnets, spammers, bruteforcers, etc.) which is updated on an hourly basis. This command will get the list and create the rules for you, if you want them automatically blocked, append |sh to the end of the command line. It's a more practical solution to block all and allow in specifics however, there are many who don't or can't do this which is where this script will come in handy. For those using ipfw, a quick fix would be {print "add deny ip from "$1" to any}. Posted in the sample output are the top two entries. Be advised the blacklisted file itself filters out RFC1918 addresses (10.x.x.x, 172.16-31.x.x, 192.168.x.x) however, it is advisable you check/parse the list before you implement the rules

Shorter, easier to remember version of cmd#7636

NTP is better, but there are situations where it can't be used. In those cases, you can do this to sync the local time to a server.

History usually only gives the command number and the command. This will add a timestamp to the history file.

Note: this will only put the correct timestamp on commands used after the export is done. You may want to put this in your .bashrc

Very handy to bring the word currently under the cursor into a :s command in Vim.

Example:

If the cursor was on the word "eggs":

:s/ ==> :s/eggs

Uses shell expansion to create a back-up called file.txt.bak