bash how to compare numbers

First option is use command test to binary compare numbers. For example:

if [ $a -eq $b ]; then
	echo "a == b"
else
	echo a!=b
fi

An operator"-eq" is equal to, -gt is greater than. For more operators type:

man test

If you are more familiar with symbols "<, >, <=, >=, ==" use double parentheses:

if (( $a < $b )); then
	echo "a < b"
fi

For POSIX shells which don't support double parentheses use test command.

Few examples of test options:

• -ge: greater or equal
• -le: less or equal
• -lt: less than
• -ne: not equal

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