Enter the DOS command line you want to test with Modify
COMMAND$ (for use with the COMMAND$ function).
┌────────Modify COMMAND$───────┐
│ Enter text for COMMAND$: │
│ │
│ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒◄── Enter up to 127
│ │ characters here,
│ <OK> │ then choose <OK>.
└──────────────────────────────┘