This allows the use of rsh (remote shell) and rcp (remote copy) for authoring websites. sftp is a much more secure protocol and is preferred.

Packages describing “rsh” as local USE flag

Package “rsh” Flag Description
net-misc/sitecopy This allows the use of rsh (remote shell) and rcp (remote copy) for authoring websites. sftp is a much more secure protocol and is preferred.
x11-apps/xsm This allows the use of rsh (remote shell) and rcp (remote copy).
app-shells/pdsh This allows the use of rsh (remote shell) and rcp (remote copy) for authoring websites. sftp is a much more secure protocol and is preferred.

All packages providing a “rsh” USE flag (3)