I want to execute the following commands:
./a.out 1
./a.out 2
./a.out 3
./a.out 4
.
.
. and so on
How to write this thing as a loop in a Makefile
?
The following will do it if, as I assume by your use of ./a.out
, you're on a UNIX-type platform.
for number in 1 2 3 4 ; do \
./a.out $$number ; \
done
Test as follows:
target:
for number in 1 2 3 4 ; do \
echo $$number ; \
done
produces:
1
2
3
4
For bigger ranges, use:
target:
number=1 ; while [[ $$number -le 10 ]] ; do \
echo $$number ; \
((number = number + 1)) ; \
done
This outputs 1 through 10 inclusive, just change the while
terminating condition from 10 to 1000 for a much larger range as indicated in your comment.
Nested loops can be done thus:
target:
num1=1 ; while [[ $$num1 -le 4 ]] ; do \
num2=1 ; while [[ $$num2 -le 3 ]] ; do \
echo $$num1 $$num2 ; \
((num2 = num2 + 1)) ; \
done ; \
((num1 = num1 + 1)) ; \
done
producing:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
4 1
4 2
4 3