Silent batch echo

[heetbeet]

Tested with Git-Bash:

$ cp polyshell.txt polyshell.cmd; ./polyshell.cmd; sh ./polyshell.cmd; mv polyshell.cmd polyshell.ps1; powershell -exec bypass ./polyshell.ps1; rm polyshell.ps1
I'm PolyShell, a batch script!
... and a Unix shell script!
... but also a PowerShell script!