Old boy linux high-end operation and maintenance course - the second level of linux commands and basic hands-on combat

 for n in `seq 512` ;do echo 1 >>a.log;done: write a 1K file, as shown below:

for n in `seq 100000` ;do /bin/cp a.log $n;done: a large for loop. (No space left on device)

ls | wc -l ：