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RamDisk.sh
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#!/bin/sh
#
# *************************************************************************
# *************************************************************************
# * RamDisk.sh - RamDisk - a HFS+ Drive/Disk Creator In RAM.
# * Copyright © 2020 Erik T Ashfolk (<atErïk＠ÖυťĹöōķ·ċōm;atErïk＠AśhFölķ·ćōm> Do Not Copy,
# * Type in English/basic-latin char. No Soliciting Permitted). All rights reserved.
# * Written initially on 2020-06-23 by Erik T Ashfolk.
# * Released with below Licenses+Restrictions+Permissions:
# * (*) Do Not Use My/Our Contribution(s) To Kill/Harm/Violate(or Steal-from)(Any) Human/Community,Earth,etc.
# * (*) GNU General Public License v3 (GPL v3) https://www.GNU.org/licenses/gpl-3.0.en.html
# *
# * RamDisk.sh - RamDisk - v0.52
# * It creates a ramdisk by using macOSX tools: diskutil, hdiutil, etc
# * Use "Eject" in Finder, to erase it. (Warning: All Data Will Be Lost).
# *************************************************************************
# *************************************************************************
#
# Notes: Primary command:
# diskutil erasevolume HFS+ 'RAM Disk' `hdiutil attach -nomount ram://NumberOfDiskSectors`
# diskutil erasevolume HFS+ 'RAM Disk' `hdiutil attach -nomount ram://8388608`
#
# *************************************************************************
# *************************************************************************
showUsage=0;
freeRAM="`./ShowMemory.sh | /usr/bin/grep 'Free (Physical/RAM)'`";
# freeRAM="`/SPECIFY-DIRECTORIES-PATH-TO-THE-FILE/ShowMemory.sh | /usr/bin/grep 'Free (Physical/RAM)'`";
freeRAM="${freeRAM#*\:\ }";
version="v0.52";
if [ ! -z $1 ] && [ ! -z $2 ] ; then
# Getting user-specified parameter number 1 which is 1st-parameter in commandline
uP1fullLength=${#1}; # example: "100MB" has fullLength = 5
sizeDigitsLength=$(( $uP1fullLength - 2 )); # example: 5 - 2 = 3
diskSize=${1:0:${sizeDigitsLength}}; # example: "100MB" - "__" = "100"
multiplierLetters="${1:$sizeDigitsLength}"; # example: "100MB" - skip digits "100" = "MB"
diskSizeMultiplier=1;
case "$multiplierLetters" in
('KB'|'kB') diskSizeMultiplier=1024; ;;
('MB') diskSizeMultiplier=1048576; ;;
('GB'|'gB') diskSizeMultiplier=1073741824; ;;
esac;
if [ "$diskSizeMultiplier" -eq "1" ]; then
printf "\033[1mRamDisk\033[0m %s (\033[1mError\033[0m: please use 2-letters at-end of disk size: \"\033[1mKB\033[0m\"(KiloBytes) or \"\033[1mMB\033[0m\"(MegaBytes) or \"\033[1mGB\033[0m\"(GigaBytes).)\n" $version;
showUsage=1;
else
diskSizeBytes=$(( $diskSize * $diskSizeMultiplier ));
if [ ! -z $3 ] && [ "$3" == "--force" ]; then
freeMem="9223372036854775807";
else
freeMem="$freeRAM";
fi;
if [ "$freeMem" -ge "$(( $diskSizeBytes / 1048576 ))" ]; then
# each sector has 512 bytes . "hdiutil" command needs sector
diskSectors=$(( $diskSizeBytes / 512 ));
# removing begin/end double-quote symbol if/when exists in "$2"
diskName="${2%\"}" ; # remove ending "
diskName="'${diskName#\"}'" ; # remove begining "
printf "\033[1mRamDisk\033[0m %s ( Please wait ... beginning to create a disk ... )\n" $version;
# create a drive/disk in RAM, and format it with HFS+ partitioning scheme:
/usr/sbin/diskutil erasevolume HFS+ $diskName `/usr/bin/hdiutil attach -nomount ram://$diskSectors` && {
printf "\033[1mRamDisk\033[0m %s (RamDisk was \033[1mcreated successfully\033[0m)\n" $version;
printf " (Note: when \033[1mEJECT\033[0m is pressed in \033[1mFinder\033[0m, then Drive/Disk is Erased & ALL-DATA is \033[1mErased+Lost\033[0m)\n";
printf " diskutil list\n";
# showing user a list of all disks/drives
/usr/sbin/diskutil list ;
} || {
printf "\033[1mRamDisk\033[0m %s (\033[1mError\033[0m: Could-Not Create RamDisk in RAM)\n" $version;
};
unset diskSectors diskName;
else
printf "\033[1mRamDisk\033[0m %s (\033[1mError\033[0m: please specify smaller size for RamDisk/RamDrive)\n" $version;
showUsage=1;
fi;
unset diskSizeBytes freeMem;
fi;
unset uP1fullLength sizeDigitsLength diskSize multiplierLetters diskSizeMultiplier;
else
showUsage=1;
fi;
if [ "$showUsage" -eq "1" ]; then
printf "\033[1mRamDisk\033[0m %s ( Current Free RAM (MBytes): \033[1m$freeRAM\033[0m )\n" $version;
printf " Released with below \033[1;4mLicenses+Restrictions+Permissions\033[0m:\n";
printf " \033[1m*\033[0m GNU General Public License v3 (GPL v3) https://www.GNU.org/licenses/gpl-3.0.en.html\n";
printf " \033[1m*\033[0m Do Not Use This To Kill/Harm/Violate (or Steal-from)(Any) Human/Community,Earth,etc.\n";
printf " \033[1m*\033[0m Copyright © 2020 Erik T Ashfolk (<at\105rïk＠ÖυťĹöōķ·ċōm\033[1m;\033[0mat\105rïk＠\101śh\106ölķ·ćōm> Do Not Copy, Type in English/basic-latin char. No Soliciting Permitted). All rights reserved.\n";
printf " Usage : RamDisk Size_in_\033[1mGB\033[0mor\033[1mMB\033[0mor\033[1mKB\033[0m \"Name_for-this_HFS+_Drive_in_RAM\"\n";
printf " example: RamDisk 1024\033[1mKB\033[0m \"My Tiny RamDrive-1\"\n";
printf " RamDisk 650\033[1mMB\033[0m \"My RamDrive-2\"\n";
printf " RamDisk 1\033[1mGB\033[0m \"My Big RamDrive-3\"\n";
printf " RamDisk 1\033[1mGB\033[0m \"My Big RamDrive-3\"\n";
printf " RamDisk 1\033[1mGB\033[0m \"My Big RamDrive-4\" --force\n";
printf " Note: when \033[1mEJECT\033[0m is pressed in \033[1mFinder\033[0m, then Drive/Disk is Erased & ALL-DATA is \033[1mErased+Lost\033[0m.\n";
printf " Note: you may use \033[1m--force\033[0m at-end, to try to create RamDrive by force, when \"FREE\" memory is not sufficient.\n";
fi;
unset freeRAM showUsage version;