They simple perform simple string operations on a single argument. You shouldn't use wild cards with them ... e # and the % operators. We also see them used as single characters and in pairs. This gives us four combi... ures is to iterate over a list of components in a single variable.
For example, you might want to do some... s or no.
brief
The brief option selector: a single character. It is safer to choose a single letter
erently within a double-brackets test than within single brackets.
<code>
[[ $a == z* ]] # True if $... rators work with the test command or occur within single test brackets.
<code>
if [ "$expr1" -a "$expr2"
