initial commit

chapter4/function_dots

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+function dots
+{
+SEC=$1   # How many seconds between dots?
+
+while true
+do
+    sleep $SEC
+    echo ".\c"
+done
+}

chapter4/function_elapsed_time

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+elasped_time ()
+{
+SEC=$1
+(( SEC < 60 )) && $ECHO "[Elasped time: $SEC seconds]\c"
+
+(( SEC >= 60  &&  SEC < 3600 )) && $ECHO "[Elasped time: $(( SEC / 60 )) min $(( SEC % 60 )) sec]\c"
+
+(( SEC > 3600 )) && $ECHO "[Elasped time: $(( SEC / 3600 )) hr $(( (SEC % 3600) / 60 )) min $(( (SEC % 3600) % 60 )) sec]\c"
+}
+

chapter4/function_rotate

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+function rotate
+{
+# PURPOSE: This function is used to give the end user
+# some feedback that "something" is running. It gives
+# a line rotating in a circle. This function is started
+# as a background process. Assign its PID to a variable
+# using
+#      rotate &       # To start
+#      ROTATE_PID=$!  # Get the PID of the last
+#                     # background job
+#
+#      At the end of execution just break out by
+#      killing the $ROTATE_PID process. We also need
+#      to do a quick "cleanup" of the leftover line of
+#      rotate output.
+#
+#      FROM THE SCRIPT:
+#           kill -9 $ROTATE_PID
+#           echo "\b\b "
+
+INTERVAL=1  # Sleep time between rotation intervals
+RCOUNT="0"  # For each RCOUNT the line rotates 1/8
+            # cycle
+
+while :     # Loop forever...until this function is killed
+do
+    (( RCOUNT = RCOUNT + 1 )) # Increment the RCOUNT
+
+    case $RCOUNT in
+    1) echo .-."\b\c"
+       sleep $INTERVAL
+       ;;
+    2) echo .\\."\b\c"
+       sleep $INTERVAL
+       ;;
+    3) echo "|\b\c"
+       sleep $INTERVAL
+       ;;
+    4) echo "/\b\c"
+       sleep $INTERVAL
+       ;;
+    *) RCOUNT="0" # Reset the RCOUNT to "0", zero.
+       ;;
+    esac
+done
+} # End of Function - rotate

chapter4/timing_test_function.bash

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+#!/bin/bash
+
+# SCRIPT: timing_test_function.bash
+# AUTHOR: Randy Michael
+
+######## DEFINE VARIABLES HERE ########
+
+# Ready script for ksh or bash
+ECHO=echo
+[[ $(basename $SHELL) == bash ]] && ECHO="echo -e"
+
+
+elasped_time ()
+{
+SEC=$1
+(( SEC < 60 )) && $ECHO "[Elasped time: $SEC seconds]\c"
+
+(( SEC >= 60  &&  SEC < 3600 )) && $ECHO "[Elasped time: $(( SEC / 60 )) min $(( SEC % 60 )) sec]\c"
+
+(( SEC > 3600 )) && $ECHO "[Elasped time: $(( SEC / 3600 )) hr $(( (SEC % 3600) / 60 )) min $(( (SEC % 3600) % 60 )) sec]\c" 
+}
+
+###### BEGINNING OF MAIN
+
+SECONDS=15
+elasped_time $SECONDS
+$ECHO
+SECONDS=60
+elasped_time $SECONDS
+$ECHO
+SECONDS=3844
+elasped_time $SECONDS
+$ECHO
+sleep 10
+elasped_time $SECONDS
+$ECHO