@Stefan Schippers is there a limit in how long I can write a TCL command? When I run a big command it says it's missing brackets and the command lines are incomplete.

If there is any line length limit it is quite large. For long commands be careful to balance all the brackets and quoting characters.

It seems it's not large enough... 🤔. I wrote a 150 lines code to run on tcl_command and it only read about 120 lines

For big commands write a tcl procedure: create a file

script.tcl

, write the procedure in it:

proc my_procedure {param1 param2} {
  puts "param1 is: $param1"
  puts "param2 is: $param2"
}

##optional: execute the procedure
my_procedure aaaa bbbb

Then at the xschem prompt source the file:

source script.tcl

If you want to source the script.tcl automatically when xschem is opened add this line in your xschemrc:

lappend tcl_files /path/to/your/script.tcl