WP shell command doesn't work in WP-CLI

[bgrgicak]

When I try to run wp shell in WP CLI I get an error: Error: The shell binary '/bin/bash' is not valid. You can override the shell to be used through the WP_CLI_CUSTOM_SHELL environment variable.

WP CLI should support wp shell.

Steps to recreate

• Open WP CLI
• Run the wp shell command
• See error