Unknown Command 'find' or 'grep'

Hello,
I'm trying to find a files containing specific text in filename and i get 'Unknown Command' for 'find' or 'grep' command.
I have connected to server and everything seems to be ok. 'Get' command working properly.

Is there anyone who have a clue whats going on?

Text script:
open ftp://user:password@name/
cd WEBPORTAL_PRODUCTION
cd 2015_04_01
grep -irn "ZLS" *
find / -type f -name "ZLS*"

Many thanks,
Artur

WinSCP does not support grep or find commands.

See this guide for a solution:
https://winscp.net/eng/docs/library_example_recursive_search_text