Bash Script: Temporary File Handling with Trap and mktemp

trap 'rm -f '$TMPFILE'' EXIT: This line sets up a trap to remove the temporary file when the script exits. The trap command catches specific signals, in this case, the EXIT signal which is sent when the script terminates. The command rm -f '$TMPFILE' is executed upon receiving the EXIT signal. This ensures that the temporary file is deleted even if the script encounters an error.

TMPFILE=$(mktemp) || exit 1: This line creates a temporary file using the mktemp command and assigns its name to the variable TMPFILE. The $(...) syntax is used to capture the output of the mktemp command. If the mktemp command fails (returns a non-zero exit code), the || operator executes the command after it, which is exit 1. This causes the script to terminate with an error code of 1, indicating that the temporary file could not be created.