哪个命令只将 access.log 的行数保存到 task1_output.txt？
access.log
task1_output.txt
wc -l < access.log > task1_output.txt
wc -w < access.log > task1_output.txt
wc -l access.log > task1_output.txt
wc -l > access.log < task1_output.txt