bash script Timer function. Creates a stopwatch and displays the time duration between calls.

Timer.sh

#!/bin/bash
## Timer Function - displays the timed duration between start and stop ##
# example:
#   Timer start
#   Script_Cmds
#   Timer stop


Timer() {
    ## Set a timer to display duration ##
    # Usage:  Timer [start|stop]
    Tcmd=$1
    case $Tcmd in
        start|Start|START) _StartSecs=$(date +%s)
            ;;
        stop|Stop|STOP) _StopSecs=$(date +%s)
                [[ ! $_StartSecs ]] && echo "[Internal Error] $FUNCNAME did not record a start." && return
                _DiffSecs=$(($_StopSecs-$_StartSecs))
                TimeLapse=$(date -u -d@"$_DiffSecs" +'%-Hh%-Mm%-Ss')
                echo "Timer: $TimeLapse"
            ;;
        *) echo "[Internal Error] $FUNCNAME: Unknown arg '$Tcmd'"
            ;;
    esac
}