For string equality comparison, use:
if [[ "$s1" == "$s2" ]]
For string does NOT equal comparison, use:
if [[ "$s1" != "$s2" ]]
For the a
contains b
, use:
if [[ $s1 == *"$s2"* ]]
(and make sure to add spaces between the symbols):
Bad:
if [["$s1" == "$s2"]]
Good:
if [[ "$s1" == "$s2" ]]
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