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
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