Renamed to bring functionality into the same namespace.

010_grub-commandline_console-blanking.sh

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+#!/usr/bin/env bash
+
+# the screen will blank after 3 minutes of inactivity on the TTY console.
+NEWARG="consoleblank=3"
+sudo sed -i -E "s|^(GRUB_CMDLINE_LINUX_DEFAULT=\"[^\"]*)\"|\1 ${NEWARG}\"|" /etc/default/grub
+sudo update_grub

010_grub-commandline_docker.sh

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+#!/usr/bin/env bash
+
+# https://fabianlee.org/2020/01/18/docker-placing-limits-on-container-memory-using-cgroups/
+
+# Internally Docker uses cgroups to limit memory resources, and in its simplest form is exposed as the  flags “-m” and “–memory-swap” when bringing up a docker container.
+
+# sudo docker run -it -m 8m --memory-swap 8m alpine:latest /bin/sh
+
+# If you see the message above, or “WARNING: Your kernel does not support cgroup swap limit.”,
+# then modify “/etc/default/grub” as below:
+
+## Docker likes kernel swappiness support (on reboot)
+sudo bash -c "perl -i -pe 's/GRUB_CMDLINE_LINUX=""/GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"/g' /etc/default/grub"
+
+sudo update-grub
+# Now that your server supports swap limit capabilities in your docker run command you can use --memory-swappiness=0 and set --memory-swap equal to --memory. You also need to set -Des.bootstrap.mlockall=true on the docker run commandline.
+
+# eg.
+# https://stefanprodan.com/2016/elasticsearch-cluster-with-docker/
+
+# docker run -d -p 9200:9200 \
+#	--name es-t0 \
+#	--network es-net \
+#	-v "$PWD/storage":/usr/share/elasticsearch/data \
+#	--cap-add=IPC_LOCK --ulimit nofile=65536:65536 --ulimit memlock=-1:-1 \
+#	--memory="2g" --memory-swap="2g" --memory-swappiness=0 \
+#	-e ES_HEAP_SIZE="1g" \
+#	es-t \
+#	-Des.bootstrap.mlockall=true \
+#	-Des.network.host=_eth0_ \
+#	-Des.discovery.zen.ping.multicast.enabled=false

010_grub-commandline_gfxmode.sh

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+#!/usr/bin/env bash
+# test script for 256 color on the fb console. https://www.robmeerman.co.uk/unix/256colours
+#wget -c -O /var/tmp/256color.pl https://gist.githubusercontent.com/hSATAC/1095100/raw/ee5b4d79aee151248bdafa8b8412497a5a688d42/256color.pl
+
+# supported modes can be found at the grub console with 'vbeinfo' or 'videoinfo
+# 0x17d 1920x1200x32 vga=381
+# 0x17c 1920x1200x8  vga=380
+
+## Add this to the /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT
+gfxmode="1920x1200x32,1920x1200x8"
+sed -i "s|^\(GRUB_GFXMODE=\).*|\1\"$gfxmode\"|" /etc/default/grub
+sed -i '/^GRUB_GFXMODE=.*/ s/.*/&\nGRUB_GFXPAYLOAD_LINUX=\"keep\"/' /etc/default/grub
+
+
+# DEPRICATED: vesafb requires a vga= on the kernel commandline.
+#sed -i 's,^\(GRUB_CMDLINE_LINUX=\).*,\1'\"vga=381\"',' /etc/default/grub
+
+mount /boot/grub
+update-grub

010_grub-commandline_ignore_ppc.sh

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+#!/usr/bin/env bash
+
+# Set ignore bios throttling on the kernel commandline
+NEWARG="processor.ignore_ppc=1"
+sudo sed -i -E "s|^(GRUB_CMDLINE_LINUX_DEFAULT=\"[^\"]*)\"|\1 ${NEWARG}\"|" /etc/default/grub
+sudo update_grub

010_grub-commandline_prevent_udev_net-rename.sh

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+#!/usr/bin/env bash
+# prevent renaming of network interfaces by udev
+#ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules
+
+## Add this to the /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT
+#sed -i 's,^\(GRUB_CMDLINE_LINUX=\).*,\1'\"net.ifnames=0\"',' /etc/default/grub
+
+

grub-commandline_mod.sh

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+#!/bin/bash
+
+# --- DEFAULTS ---
+FILE="/etc/default/grub"
+DRY_RUN=false
+NEW_SETTING=""
+
+# --- HELP FUNCTION ---
+usage() {
+  echo "Usage: sudo $0 [OPTION] \"setting=value\""
+  echo "Example: sudo $0 \"consoleblank=3\""
+  echo ""
+  echo "Options:"
+  echo "  -d, --dry-run    Show changes without applying them"
+  echo "  -h, --help       Display this help message"
+  exit 1
+}
+
+# --- ARGUMENT PARSING ---
+while [[ $# -gt 0 ]]; do
+  case $1 in
+  -d | --dry-run)
+    DRY_RUN=true
+    shift
+    ;;
+  -h | --help)
+    usage
+    ;;
+  *)
+    NEW_SETTING="$1"
+    shift
+    ;;
+  esac
+done
+
+# Check if a setting was actually provided
+if [[ -z "$NEW_SETTING" ]]; then
+  echo "❌ Error: No GRUB setting provided."
+  usage
+fi
+
+# --- LOGIC ---
+apply_grub_change() {
+  local TARGET="$1"
+  # Regex: Appends TARGET inside the quotes of GRUB_CMDLINE_LINUX_DEFAULT
+  local SED_LOGIC="/^GRUB_CMDLINE_LINUX_DEFAULT=/ s/\"\([^\"]*\)\"/\"\1 $TARGET\"/; s/  */ /g; s/ $TARGET\"/$TARGET\"/"
+
+  # 1. PRE-CHECK
+  if grep -q "$TARGET" "$FILE"; then
+    echo "ℹ️  SKIP: '$TARGET' already exists in $FILE."
+    return 0
+  fi
+
+  # 2. EXECUTION
+  if [ "$DRY_RUN" = true ]; then
+    echo "🔍 DRY RUN: Simulating '$TARGET' addition..."
+    grep "^GRUB_CMDLINE_LINUX_DEFAULT=" "$FILE" | sed "$SED_LOGIC"
+  else
+    # Ensure script is run as root for actual changes
+    if [[ $EUID -ne 0 ]]; then
+      echo "❌ Error: This script must be run with sudo to apply changes."
+      exit 1
+    fi
+
+    echo "💾 Backing up to $FILE.bak..."
+    cp "$FILE" "$FILE.bak"
+
+    echo "🔧 Applying '$TARGET' to $FILE..."
+    sed -i "$SED_LOGIC" "$FILE"
+
+    # 3. VERIFICATION & UPDATE
+    if grep -q "$TARGET" "$FILE"; then
+      echo "✅ SUCCESS: Updating bootloader..."
+      update-grub
+    else
+      echo "❌ ERROR: Failed to apply changes."
+      exit 1
+    fi
+  fi
+}
+
+# --- EXECUTE ---
+apply_grub_change "$NEW_SETTING"