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Full Discussion: Where are my bash_profile and bash_login/logout files?
Top Forums UNIX for Dummies Questions & Answers Where are my bash_profile and bash_login/logout files? Post 302406304 by tlarkin on Monday 22nd of March 2010 01:39:08 PM
Old 03-22-2010
Well, I recommend you read up on launchd, as it can run scripts at start up globally, when all users log in, or when a specific user logs in. Launchd is one launch daemon to rule them all so to speak.

For the loginhook, I actually misspoke (err mistyped?) earlier. I jumped a step ahead of myself. You need to modify the loginwindow.plist to enable a loginhook.

/Library/Preferences/com.apple.loginwindow.plist

Once you write your script you want to run, and place it in a system locally, you can modify that property list to run a loginhook script.

Code:
sudo defaults write com.apple.loginwindow LoginHook /path/to/script

There is a depreciated piece of software from Carbon Copy Cloner - Home called loginhelper or something like that. It is no longer supported, but is a GUI front end for creating log in hooks and from what I have read, people still use it currently.

Now, I don't have my bash book on me, but from what I understand about bash is that there is an order of config files it reads and looks for. Files like ~/.bash_profile and ~/.bash_rc and so forth. If those files are not present, it will just read the default profile that comes from the standard installation. By default, the user template does not create a .bash_profile, but if you create one, you can still have the Unix part of OS X take advantage of it. One example is that I added a function to my ~/.bash_profile to export man pages to PDF.

Add PDF export of Man pages in OS X | tlarkin.com

So, you can still edit that. However, if you want certain things to happen at start up or login you are best off using a login hook script or launchd to accomplish it.
 

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LEARN ABOUT OSX

networkd

networkd(8)						    BSD System Manager's Manual 					       networkd(8)

NAME

     networkd -- network daemon.

SYNOPSIS

     networkd

DESCRIPTION

     networkd is a launch-on-demand daemon that performs opreations on behalf of code in libystem_network, a component of libSystem.

     networkd has no user-specifiable command-line argument, and users should not run networkd manually.

   LOGGING
     There are several methods with which to examine networkd's internal state for debugging and diagnostic purposes. The syslog(1) logging levels
     map as follows:

	   Error - Error messages
	   Warning - Non-fatal concerns
	   Notice - Internal state messages
	   Info - Informational messages

     By default, only log level Notice through Error is logged.

     Syslog may be used to modify the mask which logging levels are logged.  For example, to enable log levels Emergency - Debug :

	   % sudo syslog -c networkd -d

     The networkd settings file may also be used to change the log level.  This method will add some additional logging that may be missing using
     the syslog technique listed above. This method is also persistent across runs of networkd For example, to enable log levels Emergency (1)
     through Debug (7):

	   % sudo defaults write /Library/Preferences/com.apple.networkd networkd_log_level -int 7

     The networkd settings file may also be used to change the log level for code in libsystem_network. For example, to enable log levels Emer-
     gency (1) through Debug (7) for libsystem_network code:

	   % sudo defaults write /Library/Preferences/com.apple.networkd libnetcore_log_level -int 7

     A SIGINFO signal will dump a snapshot summary of the internal state to the system log at log level NOTICE :

	   % sudo killall -INFO networkd

FILES

     /usr/libexec/networkd
	 The binary.

     /System/Library/LaunchDaemons/com.apple.networkd.plist
	 The launchd.plist(5) controlling the networkd job.

     /Library/Preferences/com.apple.networkd.plist
	 An optional preferences file read by networkd.

BUGS

     networkd bugs are tracked in Apple Radar component "networkd".

HISTORY

     networkd first appeared in Mac OS X 10.7.

SEE ALSO

     networkd_privileged(8), syslogd(8), launchd.plist(5)

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