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how to copy ssh keys from windows to linux machine

cat ~/.ssh/keyname.pub | ssh user@host "cat >> ~/.ssh/authorized_keys"

copy ssh key from windows to linux

# PowerShell Script
# Note: this appends the key to authorized_keys, doesn't overwrite it
type $env:USERPROFILE.sshid_rsa.pub | ssh {IP-ADDRESS-OR-FQDN} "cat >> .ssh/authorized_keys"

copy ssh key from windows to linux

 scp ~/.ssh/id_rsa.pub [linux_user]@[linux_IP/linux_hostname]:~/.ssh/authorized_keys