The 'show' command cannot be used in bash scripts

[yelen103]

Hi,

As shown in the figure above, the show command in the bash script will get an error, but when I go to yosys and execute it manually, it is normal.

[jix]

Each yosys call in your bash script starts a completely new Yosys instance starting with an empty design, discarding the current state when it exits. If you want to run multiple commands in a row they need to be part of the same yosys call. E.g. this should work:

yosys -p "
	read_verilog ~/yosys/compare/cnt.v
	proc
	show
	write_json ~/yosys/compare/cnt_ast_1.json
"

If you want to save the state across multiple yosys calls you can use write_rtlil saved.il at the end of one call and read_rtlil saved.il at the start of a following call to save and restore the current design to a file.