RamDisk.sh v0.52 script for macOS/macOSX/macOSX64.
Get (latest) script directly from here: RamDisk.sh & set "execute" bit.
or, Get attached zip file, & decompress:
RamDisk-v0.52.zip (17KBytes) file checksum:
MD5:c762519489a156a1f582bf77a8e6bd4d.
SHA1:1d30c94bb960db6d927c29d0063ea83142c2751e.