Java Reference
In-Depth Information
There are other help systems available, such as info and some GUI-based
ones. But man provides some of the quickest and most terse help when you
need to check the syntax of a command or find out if there is an option that
does what you need.
1.4
R EVIEW
We've looked at commands that will show you where files are in your directory
structure, show files' permissions and sizes, change the permissions, show you
what is in a file, look for files by searching for strings, and look for files based
on names or other properties.
Even so, we've given only the briefest coverage to only a few of the scores
of Linux commands worth knowing. Tops among these is the shell, bash in
our case. Whole topics have been written on this subject, and you would do
well to have one at hand.
1.5
W HAT Y OU S TILL D ON ' T K NOW
The shell is a powerful language in its own right. While you think of it mostly
as a command interpreter used for running other commands, it is, in fact, a
language, complete with variables, logic and looping constructs. We are not
suggesting that you write your application in shell scripts, but you will find it
useful for automating many repetitive tasks. There is so much that can be done
with shell scripts that we encourage you to read more about this and to talk
with other Linux users.
Linux is replete with so many different commands. Some are powerful
languages like awk and perl , others are simple handy utilities like head , tail ,
sort , tr , and diff . There are hundreds of other commands that we don't even
have time to mention.
1.6
R ESOURCES
• Cameron Newham and Bill Rosenblatt, Learning the Bash Shell , O'Reilly
Associates, ISBN 1565923472.
• Ellie Quigley, Linux Shells by Example , 4th ed., Prentice Hall PTR, ISBN
013147572X.
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