Numerical comparisonssuggest change
Numerical 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:
-leless or equal
-gegreater or equal
Note that the
\> 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"
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