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Index

A

aliases: Section 5.1, “What are aliases?”
ANSI-C quoting: Section 3.5, “ANSI-C quoting”
arguments: Section 2.1.2, “Checking command line arguments”
arithmetic expansion: Section 4.7, “Process substitution”
arithmetic operators: Section 4.7, “Process substitution”
array: Section 2.1, “Creating arrays”
awk: Section 1, “Getting started with gawk”
awkprogram: Section 1.2, “Gawk commands”

B

bash: Section 2, “Advantages of the Bourne Again SHell”
.bash_login: Section 1.2.2, “~/.bash_login”
.bash_logout: Section 1.2.5, “~/.bash_logout”
.bash_profile: Section 1.2.1, “~/.bash_profile”
.bashrc: Section 1.2.4, “~/.bashrc”
batch editor: Section 1.1, “What is sed?”
break: Section 5.1, “The break built-in”
boolean operators: Section 2.4, “Boolean operations”
Bourne shell: Section 1.2, “Shell types”
brace expansion: Section 4.3, “Tilde expansion”
built-in commands: Section 3.2, “Shell built-in commands”

C

case statements: Section 2.5, “Using the exit statement and if”
character classes: Section 2.2.2, “Character classes”, Section 3.2, “Character classes”
child process: Section 3.1, “General”
combined expressions: Section 1.1.1, “Expressions used with if”
command substitution: Section 4.6, “Arithmetic expansion”
comments: Section 2.2, “Adding comments”
conditionals: Section 1, “Introduction to if”
configuration files: Section 1, “Shell initialization files”
constants: Section 1.3, “Constants”
continue: Section 5.2, “The continue built-in”
control signals: Section 1.1.3, “Sending signals using the shell”
creating variables: Section 2.2, “Creating variables”
csh: The C shell, Section 1.2, “Shell types”

D

debugging scripts: Section 3, “Debugging Bash scripts”
declare: Section 1.2, “Using the declare built-in”, Section 2.1, “Creating arrays”
double quotes: Section 3.4, “Double quotes”

E

echo: Section 5.5, “An example Bash script: mysystem.sh”, Section 1.2, “script1.sh”, Section 3.2, “Debugging on part(s) of the script”, Section 1.2, “Using the echo built-in command”
editors: Section 1.1, “Writing and naming”
else: Section 2.1, “if/then/else constructs”
emacs: Section 1.1, “Writing and naming”
env: Section 2.1.1, “Global variables”
esac: Section 2.5, “Using the exit statement and if”
escape characters: Section 3.2, “Escape characters”
escape sequences: Section 1.2, “Using the echo built-in command”
/etc/bashrc: Section 1.1.2, “/etc/bashrc”
/etc/passwd: Section 1.2, “Shell types”
/etc/profile: Section 1.1, “System-wide configuration files”
/etc/shells: Section 1.2, “Shell types”
exec: Section 3.1, “General”, Section 2.4.2, “Read and exec”
execute permissions: Section 1.3, “Executing the script”
execution: Section 1.3, “Executing the script”
exit: Section 2.5, “Using the exit statement and if”
exit status: Section 1.2.1, “Testing exit status”
expansion: Section 4.1.5, “Shell expansions”, Section 4, “Shell expansion”
export: Section 2.3, “Exporting variables”
extended regular expressions: Section 1.3, “Basic versus extended regular expressions”

F

file descriptors: Section 2.3, “Redirection and file descriptors”, Section 2.4.1, “Using /dev/fd”
file name expansion: Section 4.9, “File name expansion”
find and replace: Section 2.4, “Find and replace with sed”
for: Section 1, “The for loop”
fork: Section 3.1, “General”
functions: Section 1.1, “What are functions?”

G

gawk: Section 1.1, “What is gawk?”
gawk commands: Section 1.2, “Gawk commands”
gawk fields: Section 2.1, “Printing selected fields”
gawk formatting: Section 2.2, “Formatting fields”
gawk scripts: Section 2.5, “Gawk scripts”
gawk variables: Section 3, “Gawk variables”
gedit: Section 1.1, “Writing and naming”
global variables: Section 2.1.1, “Global variables”
globbing: Section 3.2, “Debugging on part(s) of the script”
grep: Section 2.1, “What is grep?”

H

here document: Section 2.4.4, “Here documents”

I

if: Section 1.1, “General”
init: Section 3.1, “General”, Section 5.6, “Example init script”
initialization files: Section 1, “Shell initialization files”
input field separator: Section 2.4.1, “Bourne shell reserved variables”, Section 2.5, “Special parameters”, Section 3, “Gawk variables”
interactive editing: Section 2, “Interactive editing”
interactive scripts: Section 1, “Displaying user messages”
interactive shell: Section 2.2.2.1, “Invoked as an interactive login shell, or with `--login'”, Section 2.2.2.2, “Invoked as an interactive non-login shell”, Section 2.2.3.3, “Interactive shell behavior”
invocation: Section 2.2.1, “Invocation”

J

K

kill: Section 1.2, “Usage of signals with kill”
killall: Section 1.2, “Usage of signals with kill”
ksh: Korn shell, Section 1.2, “Shell types”

L

length of a variable: Section 3.2, “Length of a variable”
line anchors: Section 2.2.1, “Line and word anchors”
locale: Section 3.6, “Locales”
locate: Section 1.1, “Writing and naming”
logic flow: Section 5.4, “A word on order and logic”
login shell: Section 2.2.2.1, “Invoked as an interactive login shell, or with `--login'”

M

menu: Section 6, “Making menus with the select built-in”
metacharacters: Section 1.2, “Regular expression metacharacters”

N

nested if statements: Section 2.3, “Nested if statements”
noglob: Section 3.2, “Debugging on part(s) of the script”
non-interactive editing: Section 3, “Non-interactive editing”
non-interactive shell: Section 2.2.2.3, “Invoked non-interactively”
non-login shell: Section 2.2.2.2, “Invoked as an interactive non-login shell”
numeric comparisons: Section 1.2.2, “Numeric comparisons”

O

options: Section 6.1, “Displaying options”
output field separator: Section 3.2.1, “The output field separator”
output record separator: Section 3.2.2, “The output record separator”

P

parameter expansion: Section 4.5, “Command substitution”
PATH: Section 1.2, “script1.sh”
pattern matching: Section 3, “Pattern matching using Bash features”
positionalparams: Section 2.5, “Special parameters”, Section 1.3, “Positional parameters in functions”
POSIX: Section 2.1, “Bash is the GNU shell”
POSIX mode: Section 2.2.2.5, “POSIX mode”
primary expressions: Section 1.1.1, “Expressions used with if”
printenv: Section 2.1.1, “Global variables”
printf: Section 5.5, “An example Bash script: mysystem.sh”, Section 3.6, “The printf program”
process substitution: Section 4.8, “Word splitting”
.profile: Section 1.2.3, “~/.profile”
prompt: Section 1.3, “Changing shell configuration files”

Q

quoting characters: Section 3, “Quoting characters”

R

redirection: Section 4.1.7, “Executing commands”, Section 6.2, “Changing options”, Section 2.3, “Redirection and file descriptors”, Section 4, “I/O redirection and loops”
rbash: Section 2.2.10, “The restricted shell”
read: Section 2.1, “Using the read built-in command”
readonly: Section 1.3, “Constants”
regular expression operators: Section 1.2, “Regular expression metacharacters”, Section 2, “Interactive editing”, Section 2.4, “Special patterns”
regular expressions: Section 1, “Regular expressions”
remote invocation: Section 2.2.2.6, “Invoked remotely”
removing aliases: Section 5.2, “Creating and removing aliases”
reserved variables: Section 2.4, “Reserved variables”
return: Section 1.3, “Positional parameters in functions”

S

sed: Section 1, “Introduction”
sed editing commands: Section 1.2, “sed commands”
sed options: Section 1.2, “sed commands”
sed script: Section 3.2, “Writing output files”
select: Section 6, “Making menus with the select built-in”
set: Section 2.1.2, “Local variables”, Section 6.1, “Displaying options”, Section 1.4, “Displaying functions”
shift: Section 7, “The shift built-in”
signals: Section 1.1, “Introduction”
single quotes: Section 3.3, “Single quotes”
source: Section 1.3, “Executing the script”
special parameters: Section 2.5, “Special parameters”
special variables: Section 2.5, “Special parameters”
standard error: Section 2.3.1, “General”
standard input: Section 2.3.1, “General”
standard output: Section 2.3.1, “General”
string comparisons: Section 1.2.3, “String comparisons”
stty: Section 1.1, “Introduction”
submenu: Section 6.2, “Submenus”
subshell: Section 2.1, “Which shell will run the script?”
substitution: Section 3.3.1, “Substitution”, Section 3.3.3, “Replacing parts of variable names”
substring: Section 3.3.2, “Removing substrings”
syntax: Section 4.1.1, “Shell syntax”

T

tcsh: Section 1.2, “Shell types”
terminology: Section 5.3, “Terminology”
then: Section 1.1.2, “Commands following the then statement”
tilde expansion: Section 4.4, “Shell parameter and variable expansion”
transformation of variables: Section 3.3, “Transformations of variables”
traps: Section 2.1, “General”
true: Section 2.2.2, “Nested while loops”

U

unalias: Section 5.1, “What are aliases?”, Section 5.2, “Creating and removing aliases”
unset: Section 2.2, “Creating variables”, Section 2.3, “Deleting array variables”, Section 1.4, “Displaying functions”
until: Section 3, “The until loop”
user input: Section 2.1, “Using the read built-in command”, Section 2.2, “Prompting for user input”
user messages: Section 1.1, “Interactive or not?”

V

variables: Section 2, “Variables”, Section 1, “Types of variables”
variable expansion: Section 4.5, “Command substitution”
verbose: Section 3.2, “Debugging on part(s) of the script”
vi(m): Section 1.1, “Writing and naming”

W

wait: Section 2.2, “How Bash interprets traps”
whereis: Section 1.1, “Writing and naming”
which: Section 1.1, “Writing and naming”
while: Section 2, “The while loop”
wildcards: Section 2.2.3, “Wildcards”
word anchors: Section 2.2.1, “Line and word anchors”
word splitting: Section 4.9, “File name expansion”

X

xtrace: Section 3.1, “Debugging on the entire script”, Section 3.2, “Debugging on part(s) of the script”

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