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Generation ECC200 in Software Command and Program Directories: PATH

Command and Program Directories: PATH
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Programs and commands are usually installed in several standard system directories, such as /bin, /usr/bin, /usr/X11R6/bin, or /usr/local/bin. Some packages place their commands in subdirectories, however, which they create within one of these standard directories or in an entirely separate directory. In such cases, you may be unable to run those commands because your system may be unable to locate them in the new subdirectory. Your system maintains a set of directories that search for
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commands each time you execute one. This set of directories is kept in a system variable called PATH that is created when you start your system. If a command is in a directory that is not in this list, your system will be unable to locate and run it. To use such commands, you first need to add the new directory to the set of directories in the PATH variable. Installation tools like RPM will automatically update the PATH with the appropriate directories for you. On Red Hat systems, the PATH variable is originally assigned in the /etc/rc.d/rc.sysinit file, and further added to by different services that start up when the system boots. You could edit the /etc/rc.d/rc.sysinit file directly, but you should be very careful not to change anything else. A safer approach is to add a PATH definition in the /etc/profile file.
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To make an application available to all users, you can add the software s directory to the path entry in the /etc/profile script. The /etc/profile script is a system script executed for each user when the user logs in. Carefully edit the /etc/profile file using a text editor, such as kedit, gedit, emacs, or vi (you may want to make a backup copy first with the cp command). You add a line that begins with PATH, followed by an = sign, and the term $PATH, followed by a colon, and then the directory to be added. The $ before PATH extracts the path name from the PATH variable. If you add more than one directory, be sure a colon separates them. You should also have a colon at the end. For example, if you install the Java 2 SDK, the Java commands are installed in a subdirectory called j2sdk-1.3.0/bin in the /usr/local directory. The full pathname for this directory is /usr/local/j2sdk-1.3.0/ bin. You need to add this directory to the list of directories assigned to PATH in the /etc/profile file. The following example shows the PATH variable with its list of directories and the /usr/local/j2sdk-1.3.0/bin directory added. Notice the $ before PATH after the = sign, PATH=$PATH . PATH=$PATH:/usr/local/j2sdk-1.3.0/bin
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Individual users can customize their PATH variables by placing a PATH assignment in either their .bashrc or .bash_profile files. In this way, users can access 3 commands and programs they create or install for their own use in their own user directories (see 2 for 3 more details). On Red Hat, user .bash_profile files already contain the following PATH definition. Notice the use of $PATH, which keeps all the directories already added 3 to the PATH in previous startup scripts like /etc/profile and /etc/rc.d/rc.sysinit. PATH=$PATH:$HOME/bin The following entry in the .bash_profile file adds a user s newbin directory to the PATH variable. Notice both the colon placed before the new directory and the use of the $HOME variable to specify the pathname for the user s home directory. PATH=$PATH:$HOME/bin/:$HOME/newbin In the .bash_profile file for the root user, the PATH definition also includes sbin directories. The sbin directories hold system administration programs that the root user would need to have access to. The root user PATH is shown here:
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PATH=/usr/local/sbin:/usr/sbin:/sbin:$PATH:$HOME/bin
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