Shell Programming and Scripting

Originally Posted by man bash

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-e Exit immediately if a pipeline (which may consist of a
single simple command), a list, or a compound command
(see SHELL GRAMMAR above), exits with a non-zero staâ
tus. The shell does not exit if the command that fails
is part of the command list immediately following a
while or until keyword, part of the test following the
if or elif reserved words, part of any command executed
in a && or || list except the command following the
final && or ||, any command in a pipeline but the last,
or if the command's return value is being inverted with
!. If a compound command other than a subshell returns
a non-zero status because a command failed while -e was
being ignored, the shell does not exit. A trap on ERR,
if set, is executed before the shell exits. This option
applies to the shell environment and each subshell enviâ
ronment separately (see COMMAND EXECUTION ENVIRONMENT
above), and may cause subshells to exit before executing
all the commands in the subshell.

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