C. Index

From the list below, select the letter that is the first character of the topic you want to find: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

.
;
;;
()
{}
[]
<
<<
<&
<&-
>
>>
>&
>&-
&
&&
|
||
''
""
``
\
#

A

and, -a
arguments: functions as arguments to test conditions; of for loops; of functions
arithmetic: using bc; using expr

B

background, &
back quotes, ``: see command substitution
bc: reading from files
break: sh man page description

C

case: double semi-colons, ;;, in case statement; parentheses, (), in case statements; regular expressions in case statements; syntax
cd: sh man page description
command line debugging
command line options
colon, :: sh man page description
command substitution, ``: debugging scripts; for loop argument; effects of eval; nesting commands
comments, #: inline; line
continue: sh man page description
curly braces, {}: function delimiter; dereferencing variables; using for grouping v. variables

D

debugging scripts: command line debugging; declaring the shell; null commands; interpreting errors; pausing a script's execution; tracing a script's execution
do: in for loops; in until loops; in while loops
done: in for loops; in until loops; in while loops
dot: sh man page description
double ampersand, &&
double quotes, "": escaping metacharacters; patterns containing white space; testing strings; using with functions as arguments to test conditions; using with escape; using with single quotes
double semi-colons, ;;
double vertical bar, ||

E

echo: sh man page description
elif
else
environment: variables
escape, \: escaping metacharacters; line continuation; using with double quotes
esac
eval: behavior; definition; sh man page description
exec: definition; script I/O
exit: handling errors with; sh man page description
export: sh man page description
expr

F

false
fi
file descriptors: redirection; stderr; stdin; stdout
filename expansion: as for loop argument; effects of eval; special characters
for loop: argument list; generating; behavior; definition; intermediate variable usage; positional parameters usage; syntax
functions

as an argument to test conditions

quoting

declaration

argument list

body

delimiter

label

rules

definition

invoking

modularity

including in multiple scripts

nesting

performance

improving script performance

vs sourcing

vs subscripts

properties

return value

checking with $?

default

returning from a function

scope

of nested functions

of variables declared by functions

G

getopts: behavior; definition; OPTARG variable; processing command line options; sh man page description; syntax; usage

H

hash: sh man page description

I

if: nesting if blocks; syntax; usage
I/O devices: /dev/console; /dev/null; /dev/tty; standard I/O

J

job control

K

L

loops: for loops; loop control; break; continue; while loops; until loops

M

metacharacters: table of

N

newgrp: sh man page description

O

operators: arithmetic; file; integral; logical; string
options: arguments to; definition; forms; separated; stacked; processing; getopts; positional parameters; shell options, set
OPTARG
or, -o

P

parameters: positional; as function arguments; as for loop arguments; changing with set; handling command line options with; special
parameter substitution
parentheses, (): role in function declaration; usage in case statements
period: See dot
pipe, |: filtering with
pwd: sh man page description

Q

quoting: forms of; testing strings with quotes

R

read: pausing script execution; reading from files; sh man page description
readonly: sh man page description
redirection: file descriptors; stderr into stdout; input; file based, <; interactive, <<; syntax; loops; output; creating new files with, >; appending to existing files, >>; syntax; script I/O
regular expressions: using in case statements; utilities; table of
return: checking return value with $?; default value; function control; sh man page description; syntax

S

scripts: argument for; body; comparison to essay; declaring shell to use; terminating
set: options; positional parameters; sh man page description; tracing scripts
semicolon
shift: in while loops; sh man page description
single quotes, '': escaping metacharacters; patterns containing white space; using with double quotes
signals: definition; detection of; handling with trap; list of; sending to a program
standard I/O: closing; file descriptors; redirection; reading files with; script I/O; stderr into stdout; using exec; using loops; stderr; stdin; stdout
stop: sh man page description
subscripts: executing with exec; performance, vs functions; performance, vs sourcing; sourcing
synchronization

T

test: combining multiple tests into one; file tests; forcing a test result; functions as arguments; integer tests; sh man page description; square brackets as test, []; string tests; while loops; until loops
times: sh man page description
trap: behavior; definition; forms of; properties; sh man page description; signals; syntax
true
type: sh man page description

U

ulimit: sh man page description
umask: sh man page description
unset: sh man page description
until loop: behavior; definition; syntax; test condition

V

variables: environment variables; exporting; positional parameters; properties; data types; permissions; read-only; read-write; scope; when declared within a function; special parameters; storing; command output; filename expansion; quotes; white space; value; assignment; using parameter substitution for defaults; using read; dereferencing; using braces

W

wait: sh man page description
while loop: behavior; definition; shifting; syntax; test condition

X

Y

Z