Remove content, while keeping first top line powershell

I have a sample.txt file where I would like to remove the content, except for it first top line.

My sample.txt file looks like this:
1.dslkjfladsdjgmvjfgmldskbm;sldkvmg,;sdlmg;msj,;sdrl
2.dlkjfsadfjmsal;jsalv;dsvmdsfkgmrg,pvtpvhtphb[h.[y
3.fljsafckg,ksd,v;vyklt;vlkbmyulnmktr,ouf,f/.n,
4.dflcajsmglsdv;ks'ítb;pjk.'gpjnuk. uo.hulmk,vgjhumk.'l

I would like the output result to look like following:
1.dslkjfladsdjgmvjfgmldskbm;sldkvmg,;sdlmg;msj,;sdrl

I have tried these commands but output clears the entire file.
Clear-Content C:\sample.txt | where { $_.length -gt 2}| Set-Content C:\sample.txt

Clear-Content C:\sample.txt | Select -first 2 | Set-Content C:\sample.txt

Could someone please advise what am I missing?
Thanks
Maniman manTechnology ConsultantAsked:
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footechConnect With a Mentor Commented:
This is the fastest method that I'm aware of.  The -TotalCount parameter instructs it to just read the first line instead of the entire file.
(Get-Content C:\sample.txt -TotalCount 1) | Set-Content C:\sample.txt

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Maniman manTechnology ConsultantAuthor Commented:
Thank you! It worked.
Best Regards
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