FILE_GRP = a1.bin a2.bin b.bin ccc.bin

FILE_BAS = a_bas.bin

FILE_GET_LEN = 256

FILE_ALL_TARGET = a_all.bin

輸出：

======= (0)

a_all.bin (first 256 remain)

=======(256)

a1.bin  (olny 前256位元組)

=======(512)

a2.bin (olny 前256位元組)

=======(768)

.... 後續依次

#cat FILE_GRP to FILE_BAS,each file get it's first FILE_GET_LEN 
FILE_GRP = a1.bin a2.bin b.bin ccc.bin
FILE_BAS = a_bas.bin
FILE_GET_LEN = 256
FILE_ALL_TARGET = a_all.bin
all:
    cp $(FILE_BAS) $(FILE_ALL_TARGET)
    for tmp_file in $(FILE_GRP);do \
    dd if=$$tmp_file of=$$tmp_file.bin.tmp bs=$(FILE_GET_LEN) count=1 1>/dev/null;\
    cat $$tmp_file.bin.tmp>>file_all.bin.tmp;\
    done
    #only replace cat of FILE_GRP total size
    dd if=file_all.bin.tmp of=$(FILE_ALL_TARGET) bs=$(FILE_GET_LEN) count=$(words $(FILE_GRP)) seek=1 conv=notrunc
    rm *.bin.tmp