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need to add dev tools (such as JDK and friends) to my PATH. How do I change $PATH variable in OS X 10.8.x? Where does $PATH get set in OS X 10.8 Mountain Lion?
$PATH is nothing but an environment variable on Linux, OS X, Unix-like operating systems, and Microsoft Windows. You can specify a set of directories where executable programs are located using $PATH. The $PATH variable is specified as a list of directory names separated by colon (:) characters. To print the current settings, open the Terminal and then type:

OR

Sample outputs:

OS X: Change your PATH environment variable

You can add path to any one of the following method:

1. $HOME/.bash_profile file using export syntax.
2. /etc/paths.d directory.

Method #1: $HOME/.bash_profile file

The syntax is as follows:

In this example, add /usr/local/sbin/modemZapp/ directory to $PATH variable. Edit the file $HOME/.bash_profile, enter:
vi $HOME/.bash_profile
OR
vi ~/.bash_profile
Append the following export command:

Save and close the file. To apply changes immedialty enter:
source $HOME/.bash_profile
OR
. $HOME/.bash_profile
Finally, verify your new path settings, enter:
echo $PATH
Sample outputs:

Method #2: /etc/paths.d directory

Apple recommends the path_helper tool to generate the PATH variable i.e. helper for constructing PATH environment variable. From the man page:

The path_helper utility reads the contents of the files in the directories /etc/paths.d and /etc/manpaths.d and appends their contents to the PATH and MANPATH environment variables respectively.

(The MANPATH environment variable will not be modified unless it is already set in the environment.)

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Files in these directories should contain one path element per line.

Prior to reading these directories, default PATH and MANPATH values are obtained from the files /etc/paths and /etc/manpaths respectively.

To list existing path, enter:
ls -l /etc/paths.d/
Sample outputs:

You can use the cat command to see path settings in 40-XQuartz:
cat /etc/paths.d/40-XQuartz
Sample outputs:

To set /usr/local/sbin/modemZapp to $PATH, enter:

OR use vi text editor as follows to create /etc/paths.d/zmodemapp file:
sudo vi /etc/paths.d/zmodemapp
and append the following text:

Save and close the file. You need to reboot the system. Alternatively, you can close and reopen the Terminal app to see new $PATH changes.

Conclusion

1. Use $HOME/.bash_profile file when you need to generate the PATH variable for a single user account.
2. Use /etc/paths.d/ directory via the path_helper tool to generate the PATH variable for all user accounts on the system. This method only works on OS X Leopard and higher.

See also:

• Customize the bash shell environments from the Linux shell scripting wiki.
• Man pages – bash(1), path_helper(8)

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License	Free (Freeware)
Last Week Downloads	6
All Time Downloads	973
Filename	EwE6.5_setup.exe
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Old Versions

Software	Date Added
Ecopath with Ecosim 6.5	March 26, 2018 - Latest Version
Ecopath with Ecosim 6.4.3	March 06, 2015
Ecopath with Ecosim 6.2.0.620	June 21, 2012