Refactor scripts to be POSIX compliant

scripts/build-new-kernel

@@ -1,20 +1,20 @@
-#! /bin/bash
+#! /bin/sh
 
 YELLOW="\e[33m"
 NC="\e[0m"
 
-echo -e "\n${YELLOW}Downloading APT dependencies...${NC}\n"
+echo "\n${YELLOW}Downloading APT dependencies...${NC}\n"
 sudo apt install build-essential git -y
 sudo apt build-dep linux -y
 
-echo -e "\n${YELLOW}Downloading kernel source...${NC}\n"
-mkdir linux-parent && cd linux-parent
+echo "\n${YELLOW}Downloading kernel source...${NC}\n"
+mkdir linux-parent && cd linux-parent || exit 1
 git clone --depth 1 https://github.com/torvalds/linux
-cd linux
+cd linux || exit 1
 
-cp /boot/config-$(uname -r) .config   # Copy current kernel config
-make nconfig                          # Edit the current kernel configuration
-diff /boot/config-$(uname -r) .config # Check your changes
+cp /boot/config-"$(uname -r)" .config   # Copy current kernel config
+make nconfig                            # Edit the current kernel configuration
+diff /boot/config-"$(uname -r)" .config # Check your changes
 
 # Do not include debugging symbols. Alternatively, use `strip` to remove them. (these configs are working as of 6.14)
 scripts/config --undefine GDB_SCRIPTS
@@ -26,14 +26,14 @@ scripts/config --set-val DEBUG_INFO_NONE y
 scripts/config --set-val DEBUG_INFO_DWARF5 n
 scripts/config --disable DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 
-echo -e "\n${YELLOW}Compiling the kernel...${NC}\n"
-make -j$(nproc) deb-pkg LOCALVERSION=-custom
+echo "\n${YELLOW}Compiling the kernel...${NC}\n"
+make -j"$(nproc)" deb-pkg LOCALVERSION=-custom
 
-echo -e "\n${YELLOW}Installing the generated dpkg packages...${NC}\n"
+echo "\n${YELLOW}Installing the generated dpkg packages...${NC}\n"
 sudo dpkg -i ../linux-headers*-custom*.deb
 sudo dpkg -i ../linux-image*-custom*.deb
 
-echo -e "\n${YELLOW}Cleaning up...${NC}\n"
+echo "\n${YELLOW}Cleaning up...${NC}\n"
 cd ../..
 rm -rf linux-parent