July 2005
Intermediate to advanced
944 pages
158h 24m
English
book
Linux in a Nutshell, Fifth Edition
by Ellen Siever, Aaron Weber, Stephen Figgins, Robert Love, Arnold Robbins
Content preview from Linux in a Nutshell, Fifth Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
672
|
Chapter 6: The Bash Shell and Korn Shell
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
let
let expressions
or
((expressions))
Perform arithmetic as specified by one or more expressions. expres-
sions consist of numbers, operators, and shell variables (which
don’t need a preceding $). Expressions must be quoted if they
Name Number Description
HUP 1 Hangup
INT 2 Interrupt (usually invoked by user through Ctrl-C)
QUIT 3 Quit
ILL 4 Illegal instruction
TRAP 5 Trace trap
ABRT 6 Abort
IOT 6 IOT trap
BUS 7 Bus error (a type of illegal address access)
FPE 8 Floating-point exception (example: division by 0)
KILL 9 Kill, unblockable (often used with INT fails to terminate
process)
USR1 10 User-defined signal 1
SEGV 11 Segmentation violation (a type of illegal address access)
USR2 12 User-defined signal 2
PIPE 13 Broken pipe (generated when process on one side of pipe is
aborted)
ALRM 14 Alarm clock (used for delivering timed alerts from a
program)
TERM 15 Termination
STKFLT 16 Stack fault (a type of illegal address access)
CLD or CHLD 17 Child status has changed
CONT 18 Continue (issued after STOP or TSTP)
STOP 19 Stop, unblockable
TSTP 20 Stop (issued at terminal, usually through Ctrl-Z)
TTIN 21 Attempt to read from terminal while in background
TTOU 22 Unsuccessful attempt to write to terminal while in back-
ground
URG 23 Urgent condition on socket
XCPU ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.