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$ echo $HOME /home/chris
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The HOME variable is often used when you need to specify the absolute pathname of your home directory. In the next example, the absolute pathname of reports is specified using HOME for the home directory's path:
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$ ls $HOME/reports
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Some of the more common special variables are SHELL, PATH, PS1, PS2, and MAIL. The SHELL variable holds the pathname of the program for the type of shell you log into. The PATH variable lists the different directories to be searched for a Linux command. The PS1 and PS2 variables hold the prompt symbols. The MAIL variable holds the pathname of your mailbox file. You can modify the values for any of them to customize your shell. The PATH variable contains a series of directory paths separated by colons. Each time a command is executed, the paths listed in the PATH variable are searched one by one for that command. For example, the cp command resides on the system in the directory /usr/bin. This directory path is one of the directories listed in the PATH variable. Each time you execute the cp command, this path is searched and the cp command located. The system defines and assigns PATH an initial set of pathnames. In Linux, the initial pathnames are /usr/bin and usr/sbin. The shell can execute any executable file, including programs and scripts you have created. For this reason, the PATH variable can also reference your working directory; so if you want to execute one of your own scripts or programs in your working directory, the shell can locate
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it. No spaces can be between the pathnames in the string. A colon with no pathname specified references your working directory. Usually, a single colon is placed at the end of the pathnames as an empty entry specifying your working directory. For example, the pathname /usr/bin:/usr/sbin: references three directories: /usr/bin, /usr/sbin, and your current working directory.
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$ echo $PATH /usr/bin:/usr/sbin:
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You can add any new directory path you want to the PATH variable. This can be useful if you have created several of your own Linux commands using shell scripts. You could place these new shell script commands in a directory you created and then add that directory to the PATH list. Then, no matter what directory you are in, you can execute one of your shell scripts. The PATH variable will contain the directory for that script, so that directory will be searched each time you issue a command. You add a directory to the PATH variable with a variable assignment. You can execute this assignment directly in your shell. In the next example, the user chris adds a new directory, called mybin, to the PATH. Although you could carefully type in the complete pathnames listed in PATH for the assignment, you can also use an evaluation of PATH, $PATH, in their place. In this example, an evaluation of HOME is also used to designate the user's home directory in the new directory's pathname. Notice the empty entry between two colons, which specifies the working directory.
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$ PATH=$PATH:$HOME/mybin: $ export PATH $ echo $PATH /usr/bin:/usr/sbin::/home/chris/mybin
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If you add a directory to PATH yourself while you are logged in, the directory would be added only for the duration of your login session. When you log back in, the login initialization file, .bash_profile, would again initialize your PATH with its original set of directories. The .bash_profile file is described in detail a bit later in this chapter. To add a new directory to your PATH permanently, you need to edit your .bash_profile file and find the assignment for the PATH variable. Then, you simply insert the directory, preceded by a colon, into the set of pathnames assigned to PATH. The BASH_ENV variable holds the name of the BASH shell initialization file to be executed whenever a BASH shell is generated. For example, when a BASH shell script is executed, the BASH_ENV variable is checked and the name of the script that it holds is executed before the shell script. On Red Hat Linux, the BASH_ENV variable holds $HOME/.bashrc. This is the .bashrc file in the user's home directory. The .bashrc file is discussed later in this chapter. You could specify a different file if you wish, using that instead of the .bashrc file for BASH shell scripts. The PS1 and PS2 variables contain the primary and secondary prompt symbols, respectively. The primary prompt symbol for the BASH shell is a dollar sign, $. You can change the prompt symbol by assigning a new set of characters to the PS1 variable. In the next example, the shell prompt is changed to the -> symbol:
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