Dynamic system status MOTD for Arch Linux

motd.sh

#!/bin/bash
# Preferred installation method
# nano /etc/profile.d/motd.sh;chmod +x /etc/profile.d/motd.sh
## <paste this>
#
# Alternative installation method
# nano /usr/bin/motd.sh;chmod +x /usr/bin/motd.sh
## <paste this>
# patch.sh or # patch -d/ --dry-run -p0 -i ~/patch.txt
# don't: # echo "session    optional   pam_exec.so          stdout /usr/bin/motd.sh" >> /etc/pam.d/system-login
# that results in loads of logged "conversation failed" messages

# Color variables
W="\033[00;37m"
B="\033[01;36m"
R="\033[01;34m"
X="\033[01;37m"
A="\033[01;32m"

# Time of day
HOUR=$(date +"%H")
if [ $HOUR -lt 12  -a $HOUR -ge 0 ]
then   TIME="morning"
elif [ $HOUR -lt 17 -a $HOUR -ge 12 ]
then   TIME="afternoon"
else   TIME="evening"
fi

# Collect info
KERNEL=`uname -r`
CPU=`/usr/bin/awk -F '[ :][ :]+' '/^model name/ { print $2; exit; }' /proc/cpuinfo`
if [ -z "$CPU" ]
then CPU=`lscpu | grep 'Model name' | cut -f 2 -d ':' | awk '{$1=$1}1'`
fi
if [ -r /sys/class/thermal/thermal_zone0/temp ]
then TEMP=`head -n 1 /sys/class/thermal/thermal_zone0/temp | xargs -I{} awk "BEGIN {printf \"%d\n\", {}/1000}"`
elif [ -r /sys/class/hwmon/hwmon1/temp1_input ]
then TEMP=`head -n 1 /sys/class/hwmon/hwmon1/temp1_input | xargs -I{} awk "BEGIN {printf \"%d\n\", {}/1000}"`
elif [ -r /sys/class/hwmon/hwmon2/temp2_input ]
then TEMP=`head -n 1 /sys/class/hwmon/hwmon1/temp2_input | xargs -I{} awk "BEGIN {printf \"%d\n\", {}/1000}"`
fi
LOAD1=`cat /proc/loadavg | awk {'print $1'}`
LOAD5=`cat /proc/loadavg | awk {'print $2'}`
LOAD15=`cat /proc/loadavg | awk {'print $3'}`
USERS=`users | wc -w`
MEMORY1=`free -t -m | grep "Mem" | awk '{print $3" MB";}'`
MEMORY2=`free -t -m | grep "Mem" | awk '{print $2" MB";}'`
#MEMPERCENT=`free | awk '/Mem/{printf("%.2f% (Used) "), $3/$2*100}'`
SWAP=`free -m | tail -n 1 | awk '{print $3}'`
PSA=`ps -Afl | wc -l`
# this script is intended to run as PAM, when running on interactive shells PAM_USER is empty
if [ -n "$PAM_USER" ]
then S_USER="$PAM_USER"
elif [ -n "$USER" ]
then S_USER="$USER"
fi
[ -n "$S_USER" ] && PSU=`ps U $S_USER h | wc -l`

SPACE=`df -h --output=pcent / | sed 1d | awk '{print $1}'`
intSpace=${SPACE%\%}
PACMAN=`pacman -Qu | wc -l`
LAST_FSU=`tac /var/log/pacman.log | grep -m1 -F "[PACMAN] starting full system upgrade" | cut -d "[" -f2 | cut -d "]" -f1`
days_since=$((($(date +%s)-$(date --date="$LAST_FSU" +%s))/86400))

echo -e "
        $A. $X
       $A/#\ $X                     _     $A _ _
      $A/###\ $X      __ _ _ __ ___| |__  $A| (_)_ __  _   ___  __
     $A/#####\ $X    / _' | '__/ __| '_ \ $A| | | '_ \| | | \ \/ /
    $A/##.-.##\ $X  | (_| | | | (__| | | |$A| | | | | | |_| |>  <
   $A/##(   )##\ $X  \__,_|_|  \___|_| |_|$A|_|_|_| |_|\__,_/_/\_\\
  $A/#.--   --.#\ $X
 $A/'           '\ $B
"

echo -e "       $W Good $TIME $S_USER, welcome to $X${HOSTNAME}"
echo -e "       $R KERNEL $W= $KERNEL "
echo -en "       $R CPU    $W= $CPU @ "
if [ $TEMP -ge 75 ] # at 80 the RPi CPU becomes throttled
then echo -e "$B$TEMP\xc2\xb0C $W"
else echo -e "$TEMP\xc2\xb0C "
fi
if [ $LOAD1 != "0.00" -a $LOAD5 != "0.00" -a $LOAD15 != "0.00" ]
then echo -e "       $R LOAD   $W= $LOAD1 1 min, $LOAD5 5 min, $LOAD15 15 min "
fi
if [ $USERS -ge 2 ]
then echo -e "       $R USERS  $W= Currently $USERS users logged on "
fi
echo -e "       $R Memory Used     $W= $MEMORY1 / $MEMORY2 "
if [ $SWAP -ge 1 ]
then echo -e "       $R Swap Used     $W= $SWAP MB "
fi
echo -e "       $R Processes       $W= You are running $PSU of $PSA processes "
echo -e "       $R System Uptime   $W= `uptime --pretty | cut -c 4-` "
if [ $intSpace -ge 70 ]
then echo -e "       $R Disk Space Used $W= $B$SPACE $W "
elif [ $intSpace -ge 50 -a $intSpace -lt 70 ]
then echo -e "       $R Disk Space Used $W= $SPACE "
fi
if [ $PACMAN -ge 1 ]
then echo -e "       $R Pacman -Syu    $W= $B$PACMAN$W packages can be updated "
fi
if [ $days_since -ge 8 ]
then echo -e "        It has been $days_since day$([ $days_since -ne 1 ] && echo s) since your last ${B}pacman -Syu$W"
fi
systemctl --failed --quiet >/dev/null
if [ $? -ne 0 ]
then systemctl --failed
fi
echo ""

patch.sh

patch -d/ -p0 << 'EOF'
+++ /etc/profile	2021-02-13 00:18:13.441450462 +0100
@@ -41,6 +41,7 @@
    test -r /etc/bash.bashrc
 then
 	. /etc/bash.bashrc
+	test -r /usr/bin/motd.sh && . /usr/bin/motd.sh
 fi

 # Termcap is outdated, old, and crusty, kill it.
EOF

patch.txt

+++ /etc/profile	2021-02-13 00:18:13.441450462 +0100
@@ -41,6 +41,7 @@
    test -r /etc/bash.bashrc
 then
 	. /etc/bash.bashrc
+	test -r /usr/bin/motd.sh && . /usr/bin/motd.sh
 fi

 # Termcap is outdated, old, and crusty, kill it.

Less clutter because it hides normal values and cyan colours values that need attention. Here is an example of normal output with system update reminder: