A Practical Guide to Ubuntu Linux, Third Edition

Main Index

An italic page number such as 123 indicates 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 1024

!! reexecutes the previous event 335

# comment symbol 303, 964

# prompt 420

#! specifies a script shell 302, 963

$ bash parameters 994–999

$ in regular expressions 1092

$ in variable names 314

$! parameter 996

$# parameter 997

$$ parameter 983, 995

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

$(...) see command, substitution

$* parameter 999

$? parameter 996

$@ parameter ...