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