Learning the bash Shell, 3rd Edition

Index

A note on the digital index

A link in an index entry is displayed as the section title in which that entry appears. Because some sections have multiple index markers, it is not unusual for an entry to have several links to the same section. Clicking on any link will take you directly to the place in the text in which the marker appears.

Symbols

! (exclamation point)

!= (not equal to operator), Integer Variables and Arithmetic

!= (string comparison operator), String comparisons

conditional not operator, Combinations of Exit Statuses

debugger command, Commands

environment variable, Built-In Shell Variables

event designators, History Expansion

extended pattern-matching operator, Extended Pattern Matching

logical not operator, Integer Variables and Arithmetic

negation operator, File attribute checking

negation wildcard, Filenames, Wildcards, and Pathname Expansion

process ID shell variable, Process ID Variables and Temporary Files

" (double quotes)

arithmetic expressions in, Integer Variables and Arithmetic

around shell variables, Variables and Quoting

around special characters, Quoting

backslash preceding, Quoting Quotation Marks

command line processing of, Quoting

# (hash mark)

## (pattern-matching operator), Patterns and Pattern Matching

array element length operator, Arrays

comments, Syntax of String Operators

environment variable, Positional Parameters, Built-In Shell Variables

length operator, Length Operator

pattern-matching operator, Patterns and Pattern Matching, Advanced Examples: pushd and popd ...