template to compile/flash code without ide

templates/no-ide/.gitignore

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+*.o
+*.elf
+*.hex

templates/no-ide/Makefile

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+baud=57600
+avrType=atmega328p
+avrFreq=16000000 # 16 Mhz
+programmerDev=/dev/ttyUSB0
+programmerType=arduino
+
+cflags=-DF_CPU=$(avrFreq) -mmcu=$(avrType) -Wall -Werror -Wextra -Os
+objects=$(patsubst %.c,%.o,$(wildcard *.c))
+
+.PHONY: flash clean
+
+all: main.hex
+
+%.o: %.c
+	avr-gcc $(cflags) -c $< -o $@
+
+main.elf: $(objects)
+	avr-gcc $(cflags) -o $@ $^
+
+main.hex: main.elf
+	avr-objcopy -j .text -j .data -O ihex $^ $@
+
+flash: main.hex
+	avrdude -p$(avrType) -c$(programmerType) -P$(programmerDev) -b$(baud) -v -U flash:w:$<
+
+clean:
+	rm -f main.hex main.elf $(objects)

templates/no-ide/README

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+You don't need the Arduino IDE, you can simply use a Makefile and write your
+C code as long as you have avr-gcc, avr-libc and avrdude installed!
+
+make            # compile and generate main.hex 
+make flash      # flash it to the Arduino nano
+

templates/no-ide/hello.c

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+#include <util/delay.h>
+#include <avr/io.h>
+
+#define LED PORTB5
+
+int main(void) {
+  DDRB |= (1 << LED);
+  for/*ever*/(;;) {
+    PORTB |= (1 << LED);
+    _delay_ms(100);
+    PORTB &= (0 << LED);
+    _delay_ms(100);
+  }
+}