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Homework and Emergencies Homework & Coursework Questions Problem with path and child shells Post 302537689 by majickmann on Saturday 9th of July 2011 10:39:50 AM
Old 07-09-2011
The following should be acceptable answers:

a. This will add mytools for the current shell. At command prompt, type the following and hit "enter": PATH=$HOME/mytools:$PATH

b. This will add mytools for child shells as well. At command prompt, type the following and hit "enter": export PATH=$HOME/mytools:$PATH

c. To make this permanent, so commands in mytools directory are usable upon login to the UNIX shell (bash), just add "export PATH=$HOME/mytools:$PATH" to your .bashrc file. Most .bashrc files already have this statement, so it would just be a matter of modifying it.


The placement within PATH is significant. The shell searches for commands from left to right as you read the directories in PATH. In my example, I've placed mytools before all other directories so it is searched first. I do this for two reasons:
1. I want commands in mytools to be used before a command with the same name that is in another directory. Generally, this is not a problem as I don't intentionally use an existing command name.
2. Even if I don't have duplicate command names, I want my scripts to be found quickly. By listing mytools at the beginning, it is searched first. This may only be saving microseconds or less, but that's the way I want it.

Otherwise, adding mytools at the end of the PATH statement is certainly acceptable.

Hope this helps...
--majickmann
 

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profile(4)                                                         File Formats                                                         profile(4)

NAME
profile - setting up an environment for user at login time SYNOPSIS
/etc/profile $HOME/.profile DESCRIPTION
All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence. /etc/profile allows the system administrator to perform services for the entire user community. Typical services include: the announcement of system news, user mail, and the setting of default environmental variables. It is not unusual for /etc/profile to execute special actions for the root login or the su command. The file $HOME/.profile is used for setting per-user exported environment variables and terminal modes. The following example is typical (except for the comments): # Make some environment variables global export MAIL PATH TERM # Set file creation mask umask 022 # Tell me when new mail comes in MAIL=/var/mail/$LOGNAME # Add my /usr/usr/bin directory to the shell search sequence PATH=$PATH:$HOME/bin # Set terminal type TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid while : do if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ] then break elif [ -f /usr/share/lib/terminfo/?/$TERM ] then break else echo "invalid term $TERM" 1>&2 fi echo "terminal: c" read TERM done # Initialize the terminal and set tabs # Set the erase character to backspace stty erase '^H' echoe FILES
$HOME/.profile user-specific environment /etc/profile system-wide environment SEE ALSO
env(1), login(1), mail(1), sh(1), stty(1), tput(1), su(1M), terminfo(4), environ(5), term(5) Solaris Advanced User's Guide NOTES
Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better for serving all but the most global needs. SunOS 5.10 20 Dec 1992 profile(4)
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