Teach The NetTeach The Net

Display headers from a HTTP request to a website

Seanybob — Thu, 18 Apr 2013 02:08:53 +0000

javascript:(function(){var req=window.ActiveXObject?new ActiveXObject("Microsoft.XMLHTTP"):new XMLHttpRequest;req.open("HEAD",document.URL,false);req.send(null);alert(req.getAllResponseHeaders())})();

shell history superpowers

Seanybob — Wed, 17 Apr 2013 20:52:57 +0000

> Create ~/.inputrc and fill it with this:

"\e[A": history-search-backward

"\e[B": history-search-forward

set show-all-if-ambiguous on

set completion-ignore-case on

> This allows you to search through your history using the up and down arrows … i.e. type “cd /” and press the up arrow and you’ll search through everything in your history that starts with “cd /”.

Taken from coderwall.

Look around you. Be amazed.

Seanybob — Sat, 06 Apr 2013 01:40:29 +0000

“There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.”

- Albert Einstein (?)

A foundational shift

Seanybob — Fri, 15 Feb 2013 16:24:27 +0000

“No longer an act of surrender to the mercy of God revealed in Christ, faith was now a formal assent to doctrinal truths set forth by scholars.”
[Author to be added], speaking of the 17th century.

Why do we desire to know truth?

Seanybob — Tue, 15 Jan 2013 02:54:19 +0000

“If we see some admirable work of human art, we are at once eager to investigate the nature, the manner, the end of its production; and the contemplation of the works of God stirs us with an incomparably greater longing to learn the principles, the method, the purpose of creation. This desire, this passion, has without doubt been implanted in us by God. And as the eye seeks light, as our body craves food, so our mind is impressed with the characteristic and natural desire to know the truth of God and the causes of what we observe.”
- Origen

The Pilgrim’s Song

Seanybob — Sun, 16 Dec 2012 16:37:41 +0000

He whom I bow to only knows to whom I bow
When I attempt the ineffable name, murmuring Thou;
And dream of Pheidian fancies and embrace in heart
Meanings, I know, that cannot be the thing thou art.
All my prayers always, taken at their word, blaspheme,
Invoking with frail imageries a folk-lore dream;
And all men are idolaters, crying unheard
To senseless idols, if thou take them at their word,
And all men in their praying, self-deceived, address
One that is not (so saith that old rebuke) unless
Thou, of mere grace, appropriate, and to thee divert
Men’s arrows, all at hazard aimed, beyond desert.
Take not, oh Lord, our literal sense, but in thy great,
Unbroken speech our halting metaphor translate.

The Pilgrim’s Regress, C.S. Lewis

Grep

Seanybob — Fri, 30 Nov 2012 16:38:56 +0000

Filter output, show only matching items

ps -e | grep bash

Filter output, show inverse of matching items (all items WITHOUT pattern)

ps -e | grep -v bash

Find specific text within multiple files

grep -l  [text to find] [files to look in]
*Note: that's a lower-case L
grep -l Query *.php
*Note: Flag "-lr" will recursively search directories

Find a file on a file system

Seanybob — Fri, 30 Nov 2012 16:37:41 +0000

Find a file

find / -name 'tmp.txt'

Find a file, do not display error messages

find / -name 'tmp.txt' 2>/dev/null

Find specific text within multiple files

grep -l  [text to find] [files to look in]
*Note: that's a lower-case L
grep -l Query *.php
*Note: Flag "-lr" will recursively search directories

Hash a file

Seanybob — Fri, 30 Nov 2012 15:57:50 +0000

$ md5
$ md5 teachthe.txt

Decrypt file with openssl

Seanybob — Fri, 30 Nov 2012 15:56:29 +0000

$ openssl enc -in  -d -out  -
$ openssl enc -in teachthe.enc -d -out net.dec -rc4

To see cypher types available, they will pop up if you insert an invalid encryption type.

$ openssl enc -in teachthe.enc -d -out net.dec -feces
unknown option '-feces'
options are
-in      input file
-out     output file
-pass     pass phrase source
-e             encrypt
-d             decrypt
-a/-base64     base64 encode/decode, depending on encryption flag
-k             passphrase is the next argument
-kfile         passphrase is the first line of the file argument
-md            the next argument is the md to use to create a key
                 from a passphrase.  One of md2, md5, sha or sha1
-S             salt in hex is the next argument
-K/-iv         key/iv in hex is the next argument
-[pP]          print the iv/key (then exit if -P)
-bufsize    buffer size
-nopad         disable standard block padding
-engine e      use engine e, possibly a hardware device.
Cipher Types
-aes-128-cbc               -aes-128-cfb               -aes-128-cfb1             
-aes-128-cfb8              -aes-128-ctr               -aes-128-ecb              
-aes-128-gcm               -aes-128-ofb               -aes-128-xts              
-aes-192-cbc               -aes-192-cfb               -aes-192-cfb1             
-aes-192-cfb8              -aes-192-ctr               -aes-192-ecb              
-aes-192-gcm               -aes-192-ofb               -aes-256-cbc              
-aes-256-cfb               -aes-256-cfb1              -aes-256-cfb8             
-aes-256-ctr               -aes-256-ecb               -aes-256-gcm              
-aes-256-ofb               -aes-256-xts               -aes128                   
-aes192                    -aes256                    -bf                       
-bf-cbc                    -bf-cfb                    -bf-ecb                   
-bf-ofb                    -blowfish                  -camellia-128-cbc         
-camellia-128-cfb          -camellia-128-cfb1         -camellia-128-cfb8        
-camellia-128-ecb          -camellia-128-ofb          -camellia-192-cbc         
-camellia-192-cfb          -camellia-192-cfb1         -camellia-192-cfb8        
-camellia-192-ecb          -camellia-192-ofb          -camellia-256-cbc         
-camellia-256-cfb          -camellia-256-cfb1         -camellia-256-cfb8        
-camellia-256-ecb          -camellia-256-ofb          -camellia128              
-camellia192               -camellia256               -cast                     
-cast-cbc                  -cast5-cbc                 -cast5-cfb                
-cast5-ecb                 -cast5-ofb                 -des                      
-des-cbc                   -des-cfb                   -des-cfb1                 
-des-cfb8                  -des-ecb                   -des-ede                  
-des-ede-cbc               -des-ede-cfb               -des-ede-ofb              
-des-ede3                  -des-ede3-cbc              -des-ede3-cfb             
-des-ede3-cfb1             -des-ede3-cfb8             -des-ede3-ofb             
-des-ofb                   -des3                      -desx                     
-desx-cbc                  -id-aes128-GCM             -id-aes192-GCM            
-id-aes256-GCM             -idea                      -idea-cbc                 
-idea-cfb                  -idea-ecb                  -idea-ofb                 
-rc2                       -rc2-40-cbc                -rc2-64-cbc               
-rc2-cbc                   -rc2-cfb                   -rc2-ecb                  
-rc2-ofb                   -rc4                       -rc4-40                   
-rc4-hmac-md5              -seed                      -seed-cbc                 
-seed-cfb                  -seed-ecb                  -seed-ofb