# Numerical comparisons

suggest changeNumerical comparisons use the `-eq`

operators and friends

```
if [[ $num1 -eq $num2 ]]; then
echo "$num1 == $num2"
fi
if [[ $num1 -le $num2 ]]; then
echo "$num1 <= $num2"
fi
```

There are six numeric operators:

`-eq`

equal`-ne`

not equal`-le`

less or equal`-lt`

less than`-ge`

greater or equal`-gt`

greater than

Note that the `\<`

and `\>`

operators inside `[[ … ]]`

compare strings, not numbers.

```
if [[ 9 -lt 10 ]]; then
echo "9 is before 10 in numeric order"
fi
if [[ 9 > 10 ]]; then
echo "9 is after 10 in lexicographic order"
fi
```

The two sides must be numbers written in decimal (or in octal with a leading zero). Alternatively, use the `((…))`

arithmetic expression syntax, which performs **integer** calculations in a C/Java/…-like syntax.

```
x=2
if ((2*x == 4)); then
echo "2 times 2 is 4"
fi
((x += 1))
echo "2 plus 1 is $x"
```

Found a mistake? Have a question or improvement idea?
Let me know.

Table Of Contents