# /etc/default/sysctl

# Parameters to support /etc/rc.d/rc.S.
# Use this file to override defaults.

# -e:       Use this option to ignore errors about unknown keys.
# --system: Load settings from all system configuration files.
# -q:       Use this option to not display the values to stdout.

SYSCTL_OPTIONS="-e --system"

--- /tmp/rc.S
+++ /tmp/rc.S.new
@@ -301,13 +301,18 @@
 fi
 
 # Configure kernel parameters:
+SYSCTL_OPTIONS="-e --system"
+if [ -r /etc/default/sysctl ]; then
+  # Source user defined options.
+  . /etc/default/sysctl
+fi
 if [ -x /sbin/sysctl -a -r /etc/sysctl.conf -a -z "$container" ]; then
-  echo "Configuring kernel parameters:  /sbin/sysctl -e --system"
-  /sbin/sysctl -e --system
-elif [ -x /sbin/sysctl -a -z "$container" ]; then
-  echo "Configuring kernel parameters:  /sbin/sysctl -e --system"
+  echo "Configuring kernel parameters:  /sbin/sysctl $SYSCTL_OPTIONS"
+  /sbin/sysctl $SYSCTL_OPTIONS
+elif [ -x /sbin/sysctl  ]; then
+  echo "Configuring kernel parameters:  /sbin/sysctl $SYSCTL_OPTIONS"
   # Don't say "Applying /etc/sysctl.conf" or complain if the file doesn't exist
-  /sbin/sysctl -e --system 2> /dev/null | grep -v "Applying /etc/sysctl.conf"
+  /sbin/sysctl $SYSCTL_OPTIONS 2> /dev/null | grep -v "Applying /etc/sysctl.conf"
 fi
 
 # Check all the non-root filesystems:

rc.S
# Update the current kernel level in the /etc/motd (Message Of The Day) file,
# but only if the file exists, the file contains a line beginning with the
# word 'Linux', and the kernel version is incorrect.

cloudfare blocked criteria:
if [ -r /etc/motd ]
if [ -n "$(grep "^Linux" /etc/motd)" ]
if [ -z $(grep "^Linux.*/$(/bin/uname -sr)" /etc/motd) ]
if [ -x /bin/sed ]

#/etc/bash.bashrc
#[...]
# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set to your chroot name
#debian_chroot=devuan

# set a fancy prompt (non-color, overwrite the one in /etc/profile)
# but only if not SUDOing and have SUDO_PS1 set; then assume smart user.
if ! [ -n "${SUDO_USER}" -a -n "${SUDO_PS1}" ]; then
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
#[...]

#/etc/profile.d/environment.sh
#[...]
# Set a default shell prompt:
#PS1='`hostname`:`pwd`# '
if [ "$SHELL" = "/bin/pdksh" ]; then PS1='! $ '
elif [ "$SHELL" = "/bin/ksh" ]; then PS1='! ${PWD/#$HOME/\~}$ '
elif [ "$SHELL" = "/bin/zsh" ]; then PS1='%n@%m:%~%# '
elif [ "$SHELL" = "/bin/ash" ]; then PS1='$ '
# original
#else PS1="\u@\h:\w\$ "
# show tty
#else PS1='\u@\l${STY#[0-9]*.}.\h:\w\$ '
# show time and tty
#else PS1='\D{%Y.%m.%d}.\A|\u@\l${STY#[0-9]*.}.\h:\W\$ '
# chroot
else PS1='\u@chroot.\h:\w\$ '
fi
#[...]