osx

If you are having an issue with the Cisco VPN client after upgrading to OS X Mavericks, here is the solution…

open a terminal

edit the sysctl.conf file

sudo vim /etc/sysctl.conf

comment out the following line.

kern.ipc.maxsuckbuf=512000.

Your file should look like this after you edit…

#
# Tuning network for broadband
#
# START
# kern.ipc.maxsockbuf=512000
net.inet.tcp.sendspace=131072
net.inet.tcp.recvspace=358400
# END

Last step is to reboot

Source: http://khalid.maqsudi.net/2013/10/cisco-vpn-issue-with-os-x-mavericks.html

Let’s get started making some edits to /etc/hosts!

• Launch Terminal, found in /Applications/Utilities/ or launched through Spotlight
• Type the following command at the prompt:

sudo nano /private/etc/hosts

• Enter the administrator password when requested, you will not see it typed on screen as usual with the command line
• Once the hosts file is loaded within nano, use the arrow keys to navigate to the bottom of the hosts file to make your modifications
• When finished, hit Control+O followed by ENTER/RETURN to save changes to /private/etc/hosts, then hit Control+X to exit out of nano
• Quit out of Terminal when finished

You can verify your hosts modifications immediately with ping, Safari, or any other network app. Changes take effect immediately though some adjustments may need to be accompanied by a DNS flush which can be done with the following command in OS X 10.9:

dscacheutil -flushcache;sudo killall -HUP mDNSResponder

When flushing DNS cache with that command you will need to enter the admin password.

Source: http://osxdaily.com/2012/08/07/edit-hosts-file-mac-os-x/

On Mac OSX, the native SSH client can use the built-in keychain directly. To add your private key to the keychain simply use the command:

ssh-add -K /path/of/private/key

As an example if your private key is stored at ~/.ssh and is named id_rsa, you would use the command:

ssh-add -K ~/.ssh/id_rsa

You will then be prompted for your passcode, which will be stored in your keychain. After this you should be ready for a password-less login.

Source: https://wiki.hpcc.msu.edu/display/hpccdocs/Adding+a+Private+Key+to+Your+Mac+OSX+Keychain

You can quickly merge any two directories within Mac OS X by using the command line tool ditto. Launch the Terminal and use the following syntax:

ditto directory1 directory2

If a directory already exists at the destination (directory2) then the contents of the source (directory1) will be merged with the contents of the destination (destination2). So I want to merge pictures from “August 2010″ into “Summer 2010″ I will use:

ditto "August 2010" "Summer 2010"

The man page for ditto describes further:

In its first form, ditto copies one or more source files or directories
to a destination directory. If the destination directory does not exist
it will be created before the first source is copied. If the destination
directory already exists then the source directories are merged with the
previous contents of the destination.

If you’re not familiar with the command line, you may want to just use the GUI to perform this type of action.