My notes, things I have learned, and documentation I have created.

To page up or down through the list of messages in Mail on a MacBook Pro, hold down the fn and control keys and hit the up or down arrow depending which way you want to go in the list. Note: this does not select them, but at least allows you to scroll through them quickly.

This has been one of the most frustrating problems I have had using the MacBook Pro. I get a lot of mail that just need to scan and delete. It would be nice if I knew how to select them too. In thunderbird, you just use the fn key and the arrows to page down/up. If you use fn and shift, this will also select them. I guess I will have to use thunderbird, if I cannot find a solution.

I have many mail accounts, and I like the way Mail put the Inbox for all of them up top. It makes it easy to get to the unread messages. I would like to try to use Mail, but I need to be able to select too.

time -p dd if=/dev/sda5 of=/dev/null bs=1024k count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 25.2325 seconds, 42.6 MB/s
real 25.26
user 0.00
sys 1.82

This transferred 1 gigabyte of data in 42.g megabytes per second.

formail -Y -s sendmail -odq username < /var/spool/mail/username

sendmail -v -qRnewaddress

For example:

formail -Y -s sendmail -odq james < /var/spool/mail/james

sendmail -v -qRjames@newmailbox.com

Source: http://www.ale.org/archive/ale/ale-2005-05/msg00214.html

For the whole file try:

Goto to line one: 1G
Sort from current line to end of file: !Gsort
Or if you want to think of it as one command: 1G!Gsort

Sort a range:
Move Cursor to last line to sort
mark the line with mark ‘a’: ma
move cursor to first line to sort
sort from current line to mark ‘a’: !’asort

Now what does the special chars above mean.

‘!’ is the vi filter command, it is followed by a movement command
that says what is being filtered. That is followed by the actual
filter cmd. The filter cmd can be any executable. In this case sort.
Since vi does not know how long the filter command name is, you have
to hit carriage return to initiate the filter.

G by itself means go to the end of the file

ma means set mark a to this line. (marks a-z exist)

‘a means goto mark a.

egrep ‘[[:digit:]]{1,3}’\.'[[:digit:]]{1,3}’\.'[[:digit:]]{1,3}’\.'[[:digit:]]{1,3}’ filename

egrep “[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}” filename

Note: this will not exclude invalid IP addresses such as 500.500.500.500, but it is something to start with.

If doing a copy an paste, the single quotes need to be typed manually until I figure out how enter them correctly.

Open a command prompt using “Run as administrator” (Right mouse click on “Command Prompt” in Accessories.).

Enter:
netsh firewall set icmpsetting 8 enable

In Windows 7, this command has been deprecated and replaced with the following:

netsh advfirewall firewall add rule name=”ICMP Allow incoming V4 echo request” protocol=icmpv4:8,any dir=in action=allow

In Windows Server 2012 R2, to allow RDP access:

netsh advfirewall firewall add rule name=”RDP Allowed” protocol=tcp localport=3389 dir=in action=allow

Make sure you no other yum update service/process running.

Proxy variable without authentication:

export http_proxy=”http://proxyserver:port”

Proxy variable with authentication:

export http_proxy=”http://username:password@proxyserver:port”

Configure VNC to run at startup

vi /etc/sysconfig/vncservers
…
VNCSERVERS=”1:username”
VNCSERVERARGS[1]=”-geometry 1024×768″
…

Use ntsysv to configure vncserver to run at startup.

Configure vnc session to use GNOME

su – username # if necessary
cd .vnc
cp -p xstartup xstartup.orig

vi xstartup
###Begin file###
#!/bin/sh

# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80×24+10+10 -ls -title “$VNCDESKTOP Desktop” &
startx &
###End file###

Note: Make sure there is not blank line after the startx line.

service vncserver restart

Use your vnc client to connect to hostname:1.

top: Basic system monitoring tool. The following three tools use the same kind of display method.

iptstate: Used to monitor iptables traffic.

atop: Used to monitor overall system. Keeps historical data too.

iftop: Used to monitor network interfaces

Examples:

iptstate -f -L -t

atop 3

iftop -i eth1

top

Backup to a remote file location using tar over ssh:
tar cvzf – /localdirectory | ssh ssh root@remotehostname “dd of=/remotefilename”

Backup to a remote tape device using tar over ssh:
tar cvzf – /localdirectory | ssh ssh root@remotehostname $(mt -f remotetapedevice rewind; dd of=/remotetapedevice)$

Restore from a remote file location using tar over ssh:
cd /
ssh root@remotehostname “dd if=/remotefilename” | tar zxvf –

Examples:
Backup:
tar cvzf – /boot | ssh ssh root@thisis.myserver.name “dd of=/backup/boot.tar.gz”
tar cvzf – /boot | ssh ssh root@thisis.myserver.name $(mt -f /dev/nrst0 rewind; dd of=/dev/nrst0)$
Restore:
ssh root@thisis.myserver.name “dd if=/boot.tar.gz” | tar zxvf –