July 1995
Beginner to intermediate
244 pages
5h 58m
English
Content preview from Using csh & tcsh
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Variables
There are two types of variables: shell variables and environment variables. Shell variables are available only to the shell in which they are defined. Environment variables are available to the current shell and also to other processes (including subshells) that are started from the shell. By convention, shell variables are lowercase and environment variables are uppercase.
Some useful shell variables are listed in the table below.
Variable | Description |
|---|---|
| If set, automatic logout occurs after you have been inactive for an hour. If set to a number, logout occurs after that many minutes of inactivity. Some shells set autologout by default at login time. To disable, unset autologout in ˜/.cshrc. |
| A list of directories in which the shell looks for directories specified as arguments to cd or pushd. |
| If set to |
| Set by the shell to your current working directory when your directory changes. |
| A list of filename suffixes. Filenames ending with any of the suffixes are ignored for filename completion. |
| In csh, turns on filename completion. (Unnecessary for tcsh.) |
| If set, specifies the number of commands to save in the history list. |
| The pathname to your home directory. |
| If set, |
| Pathname of file to check periodically to see if ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.