windows 下可以替代 head 的命令是 gc

https://stackoverflow.com/questions/9682024/how-to-do-what-head-tail-more-less-sed-do-in-powershell

gc log.txt | select -first 10 # head

gc -TotalCount 10 log.txt     # also head

gc log.txt | select -last 10  # tail

gc -Tail 10 log.txt           # also tail (since PSv3), also much faster than above option

gc log.txt | more             # or less if you have it installed

gc log.txt | %{ $_ -replace '\d+', '($0)' }         # sed