### Possible Answer

is not equal to. if [ "$a" != "$b" ] This operator uses pattern matching within a construct. < is less than, in ASCII alphabetical order. if [[ "$a" < "$b" ]] - read more

These arithmetic binary operators return true if "ARG1" is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal to "ARG2", ... More information about this subject can be found in the Bash documentation. Just like the if is closed with fi, ... - read more

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