To prevent (on osx) the symlinks pause when you hit `tab`, add the following to your ~/.inputrc:

set mark-symlinked-directories on

Example for hostapd configuration file hostapd.conf
See also

Sometimes the file /var/lib/dpkg/available is corrupted. When you use the package managing tools you get messages similar to these:

dpkg: warning: parsing file '/var/lib/dpkg/available' near line 1128 package 'dash':
 missing description
dpkg: warning: parsing file '/var/lib/dpkg/available' near line 2687 package 'login':
 missing description

Usually this is not a big issue but it may be annoying. To fix it, just execute next commands:

# mv /var/lib/dpkg/available /root/
# touch /var/lib/dpkg/available
# sh -c 'for i in /var/lib/apt/lists/*_Packages; do dpkg --merge-avail "$i"; done'

Color Name	HEX	Mix
AliceBlue	#F0F8FF
AntiqueWhite	#FAEBD7
Aqua	#00FFFF
Aquamarine	#7FFFD4
Azure	#F0FFFF
Beige	#F5F5DC
Bisque	#FFE4C4
Black	#000000
BlanchedAlmond	#FFEBCD
Blue	#0000FF
BlueViolet	#8A2BE2
Brown	#A52A2A
BurlyWood	#DEB887
CadetBlue	#5F9EA0
Chartreuse	#7FFF00
Chocolate	#D2691E
Coral	#FF7F50
CornflowerBlue	#6495ED
Cornsilk	#FFF8DC
Crimson	#DC143C
Cyan	#00FFFF
DarkBlue	#00008B
DarkCyan	#008B8B
DarkGoldenRod	#B8860B
DarkGray	#A9A9A9
DarkGreen	#006400
DarkKhaki	#BDB76B
DarkMagenta	#8B008B
DarkOliveGreen	#556B2F
DarkOrange	#FF8C00
DarkOrchid	#9932CC
DarkRed	#8B0000
DarkSalmon	#E9967A
DarkSeaGreen	#8FBC8F
DarkSlateBlue	#483D8B
DarkSlateGray	#2F4F4F
DarkTurquoise	#00CED1
DarkViolet	#9400D3
DeepPink	#FF1493
DeepSkyBlue	#00BFFF
DimGray	#696969
DodgerBlue	#1E90FF
FireBrick	#B22222
FloralWhite	#FFFAF0
ForestGreen	#228B22
Fuchsia	#FF00FF
Gainsboro	#DCDCDC
GhostWhite	#F8F8FF
Gold	#FFD700
GoldenRod	#DAA520
Gray	#808080
Green	#008000
GreenYellow	#ADFF2F
HoneyDew	#F0FFF0
HotPink	#FF69B4
IndianRed	#CD5C5C
Indigo	#4B0082
Ivory	#FFFFF0
Khaki	#F0E68C
Lavender	#E6E6FA
LavenderBlush	#FFF0F5
LawnGreen	#7CFC00
LemonChiffon	#FFFACD
LightBlue	#ADD8E6
LightCoral	#F08080
LightCyan	#E0FFFF
LightGoldenRodYellow	#FAFAD2
LightGray	#D3D3D3
LightGreen	#90EE90
LightPink	#FFB6C1
LightSalmon	#FFA07A
LightSeaGreen	#20B2AA
LightSkyBlue	#87CEFA
LightSlateGray	#778899
LightSteelBlue	#B0C4DE
LightYellow	#FFFFE0
Lime	#00FF00
LimeGreen	#32CD32
Linen	#FAF0E6
Magenta	#FF00FF
Maroon	#800000
MediumAquaMarine	#66CDAA
MediumBlue	#0000CD
MediumOrchid	#BA55D3
MediumPurple	#9370DB
MediumSeaGreen	#3CB371
MediumSlateBlue	#7B68EE
MediumSpringGreen	#00FA9A
MediumTurquoise	#48D1CC
MediumVioletRed	#C71585
MidnightBlue	#191970
MintCream	#F5FFFA
MistyRose	#FFE4E1
Moccasin	#FFE4B5
NavajoWhite	#FFDEAD
Navy	#000080
OldLace	#FDF5E6
Olive	#808000
OliveDrab	#6B8E23
Orange	#FFA500
OrangeRed	#FF4500
Orchid	#DA70D6
PaleGoldenRod	#EEE8AA
PaleGreen	#98FB98
PaleTurquoise	#AFEEEE
PaleVioletRed	#DB7093
PapayaWhip	#FFEFD5
PeachPuff	#FFDAB9
Peru	#CD853F
Pink	#FFC0CB
Plum	#DDA0DD
PowderBlue	#B0E0E6
Purple	#800080
RebeccaPurple	#663399
Red	#FF0000
RosyBrown	#BC8F8F
RoyalBlue	#4169E1
SaddleBrown	#8B4513
Salmon	#FA8072
SandyBrown	#F4A460
SeaGreen	#2E8B57
SeaShell	#FFF5EE
Sienna	#A0522D
Silver	#C0C0C0
SkyBlue	#87CEEB
SlateBlue	#6A5ACD
SlateGray	#708090
Snow	#FFFAFA
SpringGreen	#00FF7F
SteelBlue	#4682B4
Tan	#D2B48C
Teal	#008080
Thistle	#D8BFD8
Tomato	#FF6347
Turquoise	#40E0D0
Violet	#EE82EE
Wheat	#F5DEB3
White	#FFFFFF
WhiteSmoke	#F5F5F5
Yellow	#FFFF00
YellowGreen	#9ACD32

CSS Color’s Names.

Tip: Operation not permitted Error

If you get an error which read as follows:

192.168.3.1:/mp3 Operation not permitted

Try to mount it as follows with -o resvport command:

mount -t nfs -o resvport 192.168.3.1:/home /home

OR mount an NFS in read/write mode, enter:

mount -t nfs -o resvport,rw 192.168.3.1:/home /home

Recommend mount Command Options

I suggest that you run the mount command it as follows to get better a performance:

mount -t nfs -o soft,intr,rsize=8192,wsize=8192,timeo=900,retrans=3,proto=tcp nas01:/sales /private/sales

Mount NFS file system over a slow and busy network

mount -t nfs -o soft,timeo=900,retrans=3,vers=3,proto=tcp pi:/home /home

See mont_nfs(8) for more information.

Ifconfig: Examples To Configure Network Interface.

1. Generate a private key.

gpg –gen-key

2. Generate an ASCII version of your public key.

gpg –armor –output pubkey.txt –export ‘Your Name’

3. Register your key with public keyservers

gpg –send-keys ‘Your Name’

4. Encrypt a file

gpg –encrypt –recipient ‘Your Name’ foo.txt

5. Decrypt file

gpg –output foo.txt –decrypt foo.txt.gpg

Use that command to copy the structure of sda to sdd:

sfdisk -d /dev/sda | sfdisk /dev/sdd

Sometimes you can need to add more swap and you can’t change the partitioning of your disk. You can add a file to you swap that we be handle like a disk partition. I recommand to create that file on a ssd disk, because when you server start to swap, it’s not a good side. But for some specific case you may have to to it: We create a 1G file and add it to the swap

dd if=/dev/zero of=/swap bs=1024 count=1048576
mkswap /swap
swapon /swap
echo "/swap swap swap defaults 0 0" >> /etc/fstab

Copy MBR between disks:

dd if=/dev/sda bs=446 count=1 | dd of=/dev/sdz bs=446 count=1

How to know what bootloader is installed:

dd if=/dev/sda bs=446 count=1 2> /dev/null| strings -a