Which command should I use to display the exit code of the previous command?echo $EXITCODEecho $CODEecho $?echo ?

Break Down the Problem

1. Identify what an exit code is.
2. Determine the correct command to display it.

Relevant Concepts

• The exit code is a numeric code returned by a command in a Unix-like operating system. Typically, a code of 0 indicates success, while any other code indicates an error.

Analysis and Detail

1. The following commands are options given:
   • echo $EXITCODE
   • echo $CODE
   • echo $?
   • echo ?
2. Among these, $? is a special variable that holds the exit status of the last executed command.

Verify and Summarize

• We can conclude that the correct command to display the exit code of the previous command is echo $?.

Final Answer

The command to display the exit code of the previous command is echo $?.