MacOS – Adding TextWrangler to the path environment

If you just typed in the exports into the terminal as noted above then the variables in the environment will only last until you exit that terminal session. So simply typing exit and then reopening another terminal will remove any setting that you applied with the noted exports performed in your question.

export MAGICK_HOME="/Library/ImageMagick-6.7.5/"
export PATH="$MAGICK_HOME/bin:$PATH"
export DYLD_LIBRARY_PATH="$MAGICK_HOME/lib/"

Additionally you can un set variables from the environment by using the unset command.

For example:

unset MAGICK_HOME # will remove MAGICK_HOME from the environment. 

You can do it for the others as well but if you do it for PATH you will lose your path setting until you close this terminal session and reopen a new window,etc.

As an experiment try typing:

env | grep MAGICK_HOME

You should see MAGICK_HOME=/Library/ImageMagick-6.7.5/ echoed back if its still in the environment. If its not then the settings have already been lost by a windows close. etc re-enter your export of MAGICK_HOME and try the above command again.

then

exit

and then finally re open a new terminal window and enter:

env | grep MAGICK_HOME 

Your settings should be gone for MAGICK_HOME. The same is true for the modification done to all the other environment variables set with the export command right in a terminal session. They will just return to their default values if you have not set them in a start-up invocation file as required for your shell environment variables to have a more permanent place in your shell enviorment.

I think these are not related. What you're seeing is the default bash prompt, which is defined in /etc/bashrc:

$ grep PS1=  /etc/bashrc
PS1='\h:\W \u\$ '

From the bash man page:

 \h     the hostname up to the first `.'
 \u     the username of the current user
 \W     the basename of the current working directory, with $HOME abbreviated with a tilde

What's happened is that your hostname is not being set correctly. It related to your network settings. It was discussed on superuser: https://superuser.com/questions/318509/hostname-issue-in-mac-os-x-lion

And on the /etc/paths.d/git file, what you did is correct. If you have git installed in /usr/local/git/bin, then the install usually creates that file for you. But the contents are trivial, so you can create it yourself. It should have a single line, containing the path to the bin directory you want added to PATH for all users:

$ ls -l /etc/paths.d/git
-rw-r--r--  1 root  wheel  19 Sep 17  2009 /etc/paths.d/git
$ od -ta /etc/paths.d/git
0000000    /   u   s   r   /   l   o   c   a   l   /   g   i   t   /   b
0000020    i   n  nl
0000023
$ wc -l /etc/paths.d/git
   1 /etc/paths.d/git
$ cat /etc/paths.d/git
/usr/local/git/bin