Bash Typewritter-style demo script. Also serves a purpose, freeing up some ram on low-level servers.

free-ram.sh

#!/usr/bin/env bash
#
#  free-ram.sh
#
#  Copyright 2016 Mathieu Aubin <[email protected]>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#
#  This is plain for fun... hahah.. Works tho.
#  lots of sleep..
#  Command is: $> sync; echo 3 >/proc/sys/vm/drop_caches
#
#   Change SPEED_VALUE to set the typewritter-effect speed
#
SPEED_VALUE=15;

# Quick root/sudo user check, else exit.
# EDIT: Moved up top, Used escaped values instead of ${MONITOR_XXXX}
function checkUser {
    if [[ $EUID -ne 0 ]]; then
        echo -e "\E[1mFREE-RAM\E[0m must be run as root, type: \E[32msudo !!\E[0m to sudo script." 1>&2;
        exit 1;
    fi
}

# Check if we are root/sudo...
checkUser;

# Define color/reset constants
MONITOR_BOLD="\E[1m";
MONITOR_COLOR="\E[32m";
MONITOR_RESET="\E[0m";
# EDIT: Set the correct "ram headers" -- seems i wasnt paying attention
RAMHEADER_TXT="  Total       Used       Free     Shared    Buffers     Cached";

# The typewritter style function
function typeslow {
    V=${1}; shift; shift;
    for (( i=0; i<${#V}; i++ )); do
        echo -n "${V:$i:1}";
        sleep $(printf 0."%02d" $((${RANDOM} % ${SPEED_VALUE} + 3)));
    done
}

# Clears the screen
clear;

# Outputs the credit line
echo -e "${MONITOR_BOLD}";
typeslow "FREE-RAM v$((${RANDOM} % 5000 + 483))+xYZ½ Created by Mathieu Aubin ";
echo -en "${MONITOR_RESET}${MONITOR_COLOR}";
typeslow "<[email protected]>";
echo -en "${MONITOR_RESET}${MONITOR_BOLD}";
typeslow " email for fun!";
echo -en "${MONITOR_RESET}\n";

# Get the BEFORE ram status and sleep a bit... zzzZZzz
RAM_BEFORE=$(free -h | grep -o "Mem.*") && sleep 3;

# Quickly output the headers and typewrite the BEFORE ram status
echo -e "\n${MONITOR_BOLD}BEFORE RAM:${MONITOR_RESET}${MONITOR_COLOR}${RAMHEADER_TXT}${MONITOR_RESET}";
typeslow "${RAM_BEFORE}";
sleep 2;

# Outputs 'yeah we are capable...'
echo -e "${MONITOR_COLOR}";
typeslow "Trying to free up as much RAM as possible...";

# Sleep and then, magically write 'done.'
sleep 4;
echo -en "${MONITOR_RESET}${MONITOR_BOLD} done.${MONITOR_RESET}\n";

# Actual ram clearing line
sync && echo 3 > /proc/sys/vm/drop_caches;

# Get the AFTER ram status and sleep a bit, makes it look hardcore...
RAM_AFTER=$(free -h | grep -o "Mem.*") && sleep 2;

# Quickly output the headers and typewrite the AFTER ram status
echo -e "\n${MONITOR_BOLD}AFTER RAM :${MONITOR_RESET}${MONITOR_COLOR}${RAMHEADER_TXT}${MONITOR_RESET}";
typeslow "${RAM_AFTER}";
sleep 2;

# Tell the user they are finally done with this... hahha
echo -e "\n${MONITOR_BOLD}";
typeslow "Process terminated.";
sleep 1;
echo -en "${MONITOR_RESET}\n";

exit;