Shell Configuration in Software

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Shell Configuration
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history and savehist
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As you learned earlier, the history variable can be used to determine the number of history events you want saved You simply assign to it the maximum number of events that history will record When the maximum is reached, the count starts over again from 1 The savehist variable, however, holds the number of events that will be saved in the file history when you log out When you log in again, these events will become the initial history list In the next example, up to 20 events will be recorded in your history list while you are logged in However, only the last 5 will be saved in the history file when you log out Upon logging in again, your history list will consist of your last 5 commands from the previous session
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> set history=20 > set savehist=5
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PART II
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In the TCSH shell, the mail variable combines the features of the MAIL, MAILCHECK, and MAILPATH variables in the BASH and PDKSH shells The TCSH shell mail variable is assigned as its value an array whose elements contain both the time interval for checking for mail and the directory pathnames for mailbox files to be checked To assign values to these elements, you assign an array of values to the mail variable The array of new values is specified with a list of words separated by spaces and enclosed in parentheses The first value is a number that sets the number of seconds to wait before checking for mail again This value is comparable to that held by the BASH shell s MAILCHECK variable The remaining values consist of the directory pathnames of mailbox files that are to be checked for your mail Notice that these values combine the functions of the BASH and Korn shells MAIL and MAILPATH variables In the next example, the mail variable is set to check for mail every 20 minutes (1200 seconds), and the mailbox file checked is in usr/mail/chris The first value in the array assigned to mail is 1200, and the second value in the array is the pathname of the mailbox file to be checked
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> set mail ( 1200 /usr/mail/chris )
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You can, just as easily, add more mailbox file pathnames to the mail array In the next example, two mailboxes are designated Notice the spaces surrounding each element
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> set mail ( 1200 /usr/mail/chris /home/mail/chris )
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TCSH/C Shell Initialization Files: login, tcshrc, logout
The TCSH shell has three initialization files: login, logout, and tcshrc The files are named for the operation they execute The login file is a login initialization file that executes each time you log in The logout file executes each time you log out The tcshrc file is a shell initialization file that executes each time you enter the TCSH shell, either from logging in or by explicitly changing to the TCSH shell from another shell with the tcsh command
Part II:
The Linux Shell and File Structure
login
The TCSH shell has its own login initialization file called the login file that contains shell commands and special variable definitions used to configure your shell The login file corresponds to the profile file used in the BASH and PDKSH shells A login file contains setenv commands that assign values to special environment variables, such as TERM You can change these assigned values by editing the login file with any of the standard editors You can also add new values Remember, however, that in the TCSH shell, the command for assigning a value to an environment variable is setenv In the next example, the EXINIT variable is defined and assigned the Vi editor s line numbering and auto-indent options
> setenv EXINIT 'set nu ai'
Be careful when editing your login file Inadvertent editing changes could cause variables to be set incorrectly or not at all It is wise to make a backup of your login file before editing it If you have made changes to your login file and you want the changes to take effect during your current login session, you will need to re-execute the file You do so using the source command The source command will actually execute any initialization file, including the tcshrc and logout files In the next example, the user re-executes the login file
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