A Practical Guide to Linux Commands, Editors, and Shell Programming, Second Edition

Main Index

An italic page number such as 123 indictes a definition. A light page number such as 456 indicates a brief mention. Page numbers followed by the letter t refer to tables. Only variables that must always appear with a leading dollar sign are indexed with a leading dollar sign. Other variables are indexed without a leading dollar sign.

Symbols

! (NOT) Boolean operator 468, 574

!! reexecutes the previous event 313

# comment 756

# comment symbol 281, 408

#! specifies a script shell 280, 407

$ bash parameters 438–443

$ in regular expressions 890

$ in variable names 292

$ prompt 27

$! parameter 440

$# parameter 441

$# variable 371, 372

$#argv variable 372

$$ parameter 427, 439

$$ variable 376

$((...)) see arithmetic, expansion

$(...)