April 19th, 2011
To get a quick list of users in AD whose accounts are locked, you can use Quest Software’s free ActiveRoles Management Shell for Active Directory PS-Snapin. This snap-in simplifies a lot of the AD related functions through Powershell, finding locked user accounts is just one of them.
get-QADUser -Locked
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March 3rd, 2011
This is a one step command to extract and untar a tar.gz file.
tar zxvf filename.tar.gz
z = Gunzip(uncompress) it before extracting, used on file ending in .tar.gz or .tgz
x = Extract the contents of the TAR file
v = Verbose – display contents as it is tarring or extracting
f = Filename to follow
Note: If the file does not have “.gz” extension that means its already uncompressed and one has to just extract it using “tar xvf” command.
This is a two step command to extract and untar the file.
gunzip filename.tar.gz
tar xvf filename.tar
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February 3rd, 2011
Everyone knows you can use SSH to tunnel traffic through a remote host running an SSH server. This can allow you to use the web, for instance, as if you were at that remote host. You do this by creating a SOCKS proxy and then setting your local browser to use this proxy.
$ssh -D 8888 username@remotesshserver
This command tells your machine to create a tunnel to the remote ssh server and create a proxy on your local machine at port 8888 for you to use.
Now all you need to do is configure your browser to use this proxy.
Server: localhost or 127.0.0.1
Port: 8888
Although using this proxy through firefox will secure your web traffic, it will not hide your DNS queries. With SOCKS 5 in Firefox you can specify which side of the proxy handles DNS lookups. This can be done by setting network.proxy.socks_remote_dns = true in about:config.
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February 2nd, 2011
This is high-level overview of an ISDN call.
Call Setup
993697mS ISDNL3Tx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
Message Type = Setup
InformationElement = BearerCapability
0000 04 03 80 90 a2
InformationElement = CHI
0000 18 03 a9 83 97
InformationElement = CallingPartyNumber
0000 6c 0c 00 80 33 30 33 35 35 35 31 32 30 34
InformationElement = CalledPartyNumber
0000 70 0b 80 37 32 30 34 34 34 35 32 33 37
Call Handling Information
993737mS ISDNL3Rx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
Message Type = CallProceeding
InformationElement = CHI
0000 18 03 a9 83 97= use B channel 23
Phone rings on the other side
993746mS ISDNL3Rx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
Message Type = Alerting
The other side answers the call
1005111mS ISDNL3Rx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
Message Type = Connect
InformationElement = PI
0000 1e 02 81 82
InformationElement = Shift 6
InformationElement = ??(28)
0000 28 0e 31 73 74 20 32 20 77 69 72 73 20 44 43 50
Speech path established
1005112mS ISDNL3Tx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
Message Type = ConnectAck
Call disconnected
1007058mS ISDNL3Rx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
Message Type = Disconnect
InformationElement =
0000 08 02 81 90=Cause code 90=Normal call clearing
Channel Released by provider
1007059mS ISDNL3Tx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
Message Type = Release
Channel free for new use
1007077mS ISDNL3Rx: v=0 peb=5
ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
Message Type = ReleaseComplete
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November 29th, 2010
Quest Software’s free ActiveRoles Management Shell for Active Directory PS-Snapin simplifies a lot of the AD related functions through Powershell. Following is a list of some commonly used user related actions.
Finding non-expiring passwords
get-QADUser -PasswordNeverExpires
Finding disabled accounts
get-qaduser -disabled
Enabling disabled accounts
enabled-qaduser -identity
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