Endpoint Encryption

I'm trying to take input from a web page and encrypt the info on the fly, store it in a file.

At no point can a file contain 'clear text'; we need to encrypt the data before it is written to a file.

Can PGP Command Line (or other Symantec tool) perform this?  and if so, How?

No.  It processes files, not the raw data.  I am not aware of any Symantec tool that would really work for this by itself.  The best option if you want to have the files always in an encrypted state would be to encrypt the drive that the files would reside on.  The data would be encryped as it is saved.

If you then chose to further process the files by adding encryption via PGP Command Line before transport to a non-encrypted drive, that would ensure the files are always in an encrypted state.

Only way is using script to write data on temporal file, encrypt using PGPCommand Line and delete temporal file after encrypt.

PGP CL can delete file after encrypt.