Learning the bash Shell: Unix Shell Programming (In a Nutshell (OReilly))

Index

[SYMBOL] [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]

! (exclamation point)

     != (not equal to operator)

     != (string comparison operator)

     conditional not operator

     debugger command

     environment variable     event designators

     extended pattern-matching operator

     logical not operator

     negation operator     negation wildcard     process ID shell variable

" (double quotes)

     arithmetic expressions in     around shell variables     around special characters

     backslash preceding

     command line processing of

# (hash mark)

     ## (pattern-matching operator)     array element length operator

     comments

     environment variable 2nd     length operator

     pattern-matching operator 2nd

     prepend comment, vi     printf flag$ (dollar sign)     $$ (shell variable)

     $((...)) (arithmetic expressions)

     $((...)) (arithmetic test)

     environment variable

     variable substitution 2nd 3rd

     vi command 2nd

     word designator

$0 positional parameter

$1 positional parameter

$2 positional parameter

$3 positional parameter

$else directive, readline

$endif directive, readline

$if directive, readline% (percent sign)     %% (job most recently put in background)

     %% (pattern-matching operator) 2nd

     %+ (job most recently put in background)     %- (job second-most recently put in background)

     %? (job containing string)

     job numbers

     modulus operator

     pattern-matching operator

     printf format specifiers 2nd

     word designator

& (ampersand)     && (logical and operator) 2nd 3rd

     &\\> (output and error redirection)

     bitwise and operator

     running commands in background 2nd' (single quotes)     around special characters

     command line processing of

     enclosing RETURN     in alias definition     when to use

( ) (parentheses)

     ((...)) (arithmetic test) 2nd 3rd

     command substitution

     grouping conditional operators     in arithmetic expressions

     nested subshells

* (asterisk)     ** (exponentiation operator)

     environment variable 2nd 3rd

     extended pattern-matching operator     multiplication operator     pattern-matching operator     special array index

     textual completion, vi

     wildcard

     word designator

+ (plus sign)

     ++ (increment operator)

     addition operator

     extended pattern-matching operator

     printf flag

     vi command 2nd

     xtrace output

, (comma)

     sequential evaluation operator

     vi command- (hyphen)     -- (decrement operator)

     append word, vi

     environment variable     preceding options

     printf flag

     subtraction operator

     vi command 2nd

-a (file attribute operator)

-a (logical operator)

-d (file attribute operator)

-e (file attribute operator) -eq (equal to test operator)

-eq (integer comparison operator)

-f (file attribute operator)

-G (file attribute operator) -ge (greater than or equal to test operator) -ge (integer comparison operator)

-gt (greater than test operator)

-gt (integer comparison operator) -le (integer comparison operator) -le (less than or equal to test operator)

-lt (integer comparison operator)

-lt (less than test operator)

-N (file attribute operator)

-n (string comparison operator) -ne (integer comparison operator)

-ne (not equal to test operator)

-nt (file attribute operator) -O (file attribute operator)

-o (logical operator)

-ot (file attribute operator) -r (file attribute operator) -s (file attribute operator) -w (file attribute operator)

-x (file attribute operator)

-z (string comparison operator)

. (dot)

     .. (parent directory)

     command

     current directory

     preceding filenames 2nd

     synonym to source command

     vi command

.bash_profile file

     environment file and

     environment variables in

     restricted 2nd.bashrc file     ignoring

     restricted

.inputrc file .profile file

/ (slash)

     // (pattern-matching and replacement operator)

     division operator

     in restricted shell

     pattern-matching and replacement operator

     vi command

0 (zero) environment variable 0 (zero) printf flag

0 (zero) word designator

: (colon)

     :+ (string operator) 2nd     :- (string operator)     := (string operator) 2nd

     :? (string operator) 2nd

     command     string operator; (semicolon)

     statement separator

     vi command

< (less than sign)

     <& (input redirection)     <&- (input redirection)

     << (bit-shift left operator)

     << (here-document) 2nd     <= (less than or equal to operator)

     <\\> (input/output redirection)

     input redirection     less than operator     redirecting input     string comparison operator

= (equal sign)

     == (equal to operator)

     string comparison operator

     textual completion, vi

> (greater than sign)

     output redirection

? (question mark)

     debugger command

     environment variable 2nd

     extended pattern-matching operator

     vi command

     wildcard

@ (at sign)     environment variable 2nd 3rd     extended pattern-matching operator

     hostname completion

     special array index[] (brackets)

     [...] (condition test) 2nd 3rd

     [[...]] (condition test) 2nd 3rd

     wildcard

\\> (greater than sign)

     \\>& (output redirection) 2nd

     \\>&- (output redirection)

     \\>= (greater than or equal to operator)     \\>\\> (bit-shift right operator)

     \\>\\> (output redirection)

     \\>| (output redirection) 2nd

     greater than operator     output redirection     string comparison operator

\\\\ (backslash)

     backslash-escaping     continuation character 2nd     escape character, echo

     escape character, prompt strings

     textual completion, vi

^ (caret)

     bitwise exclusive or operator     event designator

     pipe character 2nd

     representing CTRL key     vi command

     word designator

{} (braces)     brace expansion wildcards     command blocks in     in shell variable syntax

| (vertical bar)

     bitwise or operator

     extended pattern matching

     in case statement

     pipe 2nd 3rd

     vi command

     || (logical or operator) 2nd 3rd

~ (tilde)

     bitwise not operator

     home directory

     in pathnames 2nd

     invert case, vi

     username completion