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+   -eq
+          is equal to
+
+          if [ "$a" -eq "$b" ]
+
+   -ne
+          is not equal to
+
+          if [ "$a" -ne "$b" ]
+
+   -gt
+          is greater than
+
+          if [ "$a" -gt "$b" ]
+
+   -ge
+          is greater than or equal to
+
+          if [ "$a" -ge "$b" ]
+
+   -lt
+          is less than
+
+          if [ "$a" -lt "$b" ]
+
+   -le
+          is less than or equal to
+
+          if [ "$a" -le "$b" ]
+
+   <
+          is less than (within double parentheses)
+
+          (("$a" < "$b"))
+
+   <=
+          is less than or equal to (within double parentheses)
+
+          (("$a" <= "$b"))
+
+   >
+          is greater than (within double parentheses)
+
+          (("$a" > "$b"))
+
+   >=
+          is greater than or equal to (within double parentheses)
+
+          (("$a" >= "$b"))
+
+   string comparison
+
+   =
+          is equal to
+
+          if [ "$a" = "$b" ]
+
+          Caution
+
+   Note the whitespace framing the =.
+   if [ "$a"="$b" ] is not equivalent to the above.
+
+   ==
+          is equal to
+
+          if [ "$a" == "$b" ]
+
+          This is a synonym for =.