Is there a SCP alternative for PowerShell?

There is a handy little tool that comes with Putty called pscp.exe that will do this and can be called in powershell easily.

Example below copies from windows to a CentOS box (logging in as the usercode "bill") and you use the -pw switch in pscp to pass in a password (otherwise the command window that is spawned will prompt for the Linux password):

Start-Process 'C:\Program Files (x86)\PuTTY\pscp.exe' -ArgumentList ("-scp -pw password C:\Document.rtf [email protected]:/home/bill/")  

PuTTY Secure Copy client
Release 0.62
Usage: pscp [options] [user@]host:source target
       pscp [options] source [source...] [user@]host:target
       pscp [options] -ls [user@]host:filespec
Options:
  -V        print version information and exit
  -pgpfp    print PGP key fingerprints and exit
  -p        preserve file attributes
  -q        quiet, don't show statistics
  -r        copy directories recursively
  -v        show verbose messages
  -load sessname  Load settings from saved session
  -P port   connect to specified port
  -l user   connect with specified username
  -pw passw login with specified password
  -1 -2     force use of particular SSH protocol version
  -4 -6     force use of IPv4 or IPv6
  -C        enable compression
  -i key    private key file for authentication
  -noagent  disable use of Pageant
  -agent    enable use of Pageant
  -batch    disable all interactive prompts
  -unsafe   allow server-side wildcards (DANGEROUS)
  -sftp     force use of SFTP protocol
  -scp      force use of SCP protocol

pscp.exe is a viable option, but I have been using a library from Rebex for a couple years now for SFTP and FTPS transfers in both C# apps and PowerShell scripts with great success. Their package also includes an SCP object but I haven't personally used it.

It does cost money vs. pscp being free. Before selecting the Rebex package, I had considered going the PuTTY route but my team decided that having a library we could easily roll into any app/script was worthwhile in the long term.