efault value to a variable normally read from the command-line arguments, when no such arguments are given.... efault value to a variable normally read from the command-line arguments, when no such arguments are given.... rname: followed by message, and abort the current command or script. Omitting message produces the default ... hese operators are ideal for setting defaults for command-line arguments in case the user omits them. We'll
n any case,
#+ return the exit status of the last command executed.
</code>
==== compound comparison ====
... code>
The -o and -a operators work with the test command or occur within single test brackets.
<code>
if
