Advanced Bash−Scripting Guide

# AND LIST executes on true, OR LIST on false.
exit 0
Advanced Bash−Scripting Guide
If the first command in an "or list" returns true, it will execute.
The exit status of an and list or an or list is the exit status of the last command executed.
Clever combinations of "and" and "or" lists are possible, but the logic may easily become convoluted and
require extensive debugging.
false && true || echo false
# false
# Same result as
( false && true ) || echo false # false
# But *not*
false && ( true || echo false ) # (nothing echoed)
# Note left−to−right grouping and evaluation of statements,
# since the logic operators "&&" and "||" have equal precedence.
# It's best to avoid such complexities, unless you know what you're doing.
# Thanks, S.C.
See Example A−8 and Example 7−4 for illustrations of using an and / or list to test variables.
Chapter 25. List Constructs 291