diff --git a/cheatsheets/dd b/cheatsheets/dd
new file mode 100644
index 0000000..c1db5f3
--- /dev/null
+++ b/cheatsheets/dd
@@ -0,0 +1,4 @@
+# Read from {/dev/urandom} 2*512 Bytes and put it into {/tmp/test.txt}
+# Note: At the first iteration, we read 512 Bytes.
+# Note: At the second iteration, we read 512 Bytes.
+dd if=/dev/urandom of=/tmp/test.txt count=512 bs=2
diff --git a/cheatsheets/gcc b/cheatsheets/gcc
index fa8b245..28a78c0 100644
--- a/cheatsheets/gcc
+++ b/cheatsheets/gcc
@@ -6,3 +6,16 @@ gcc -o file file.c
 
 # Debug symbols
 gcc -g
+
+# Debug with all symbols.
+gcc -ggdb3
+
+# Build for 64 bytes
+gcc -m64
+
+# Include the directory {/usr/include/myPersonnal/lib/} to the list of path for #include <....>
+# With this option, no warning / error will be reported for the files in {/usr/include/myPersonnal/lib/}
+gcc -isystem /usr/include/myPersonnal/lib/
+
+# Build a GUI for windows (Mingw) (Will disable the term/console)
+gcc -mwindows
diff --git a/cheatsheets/grep b/cheatsheets/grep
index cd79eb5..aeb2de3 100644
--- a/cheatsheets/grep
+++ b/cheatsheets/grep
@@ -9,3 +9,7 @@ grep -R pattern folder
 
 # Getting pattern from file (one by line):
 grep -f pattern_file file
+
+# Find all files who contain {pattern} in the directory {directory}.
+# This will show: "file:line my research"
+grep -rnw 'directory' -e "pattern"
diff --git a/cheatsheets/netstat b/cheatsheets/netstat
index c479fae..d932ab2 100644
--- a/cheatsheets/netstat
+++ b/cheatsheets/netstat
@@ -1,3 +1,5 @@
+# WARNING ! netstat is deprecated. Look below.
+
 # To view which users/processes are listening to which ports:
 sudo netstat -lnptu
 
@@ -11,3 +13,16 @@ Example output: 1507/python
 
 # Fast display of ipv4 tcp listening programs
 sudo netstat -vtlnp --listening -4
+
+# WARNING ! netstat is deprecated.
+# Replace it by:
+ss
+
+# For netstat-r
+ip route
+
+# For netstat -i
+ip -s link
+
+# For netstat-g
+ip maddr
diff --git a/cheatsheets/python b/cheatsheets/python
new file mode 100644
index 0000000..498cd15
--- /dev/null
+++ b/cheatsheets/python
@@ -0,0 +1,13 @@
+# Desc: Python is a high-level programming language.
+
+# Basic example of server with python
+# Will start a Web Server in the current directory on port 8000
+# go to http://127.0.0.1:8000
+
+# Python v2.7
+python -m SimpleHTTPServer
+# Python 3
+python -m http.server 8000
+
+# SMTP-Server for debugging, messages will be discarded, and printed on stdout.
+python -m smtpd -n -c DebuggingServer localhost:1025
diff --git a/cheatsheets/wget b/cheatsheets/wget
index 0ba5a3c..d0bcd7b 100644
--- a/cheatsheets/wget
+++ b/cheatsheets/wget
@@ -10,11 +10,14 @@ wget -c http://path.to.the/file
 # To download multiples files with multiple URLs
 wget URL1 URL2
 
-# To parse a file that contains a list of URLs to fetch each one 
+# To parse a file that contains a list of URLs to fetch each one
 wget -i url_list.txt
 
-# To download files according to a pattern 
+# To download files according to a pattern
 wget http://www.myserver.com/files-{1..15}.tar.bz2
 
 # To download all the files in a directory with a specific extension if directory indexing is enabled
 wget -r -l1 -A.extension http://myserver.com/directory
+
+# Allows you to download just the headers of responses (-S --spider) and display them on Stdout (-O -).
+wget -S --spider -O - http://google.com