trap debug

In Linux system programming and scripting, understanding how long your script or a particular part of your script takes to execute can provide critical insights, whether for optimization, debugging, or just curiosity. While there are traditional methods like time and date for simple cases, these might not suffice when you want to track the performance of individual commands within a script. This is where Bash's trap '...' DEBUG and the $BASH_COMMAND variable come into play. Q: What is the trap command in Bash, and how is it used? A: The trap command in Bash is used to specify a script or command that will be executed when a signal or a specific event occurs in a script.