Little script to gather current system info with only standard dependencies. It's meant as a replace for the landscape-sysinfo on the MOTD on non-Ubuntu systems

sysinfo.sh

#!/bin/sh
####
# COLOURS
# for i in {1..255}; do tput setaf $i ; echo "$i: The quick fox jumps over the lazy dog"; done
####
CLR_RED="$(tput setaf 9)"
CLR_BLUE="$(tput setaf 213)"
CLR_GRN="$(tput setaf 46)"
CLR_YLLW="$(tput setaf 11)"
CLR_RESET="$(tput sgr0)"

# Dependencies
DEPS="grep uptime tr bc xargs lsblk awk tput ifconfig"

# Checks that all needed programs are installed (they should be available on any system,
# even on minimal distros
for d in $DEPS
do
	if ! command -v "$d" >/dev/null 2>&1
	then
		# Prints the message in red
		tput setaf 196
		printf "Dependency not available: %s\n" "$d"
		tput sgr0
		exit 1
	fi
done

#---------------------
# Current load of the CPU
sysload="$(
	uptime \
	| grep -Po "load average:\s?[0-9]+.[0-9]{2}" \
	| tr -d \  \
	| tr , . \
	| cut -d: -f 2
)"

# Time that the system has been running
uptime="$(uptime -p)"

# Number of available processors
# /proc/cpuinfo shows information about every available CPU; but it starts with indes 0,
# so the total count is last_index + 1
num_cpus="$(
	grep -P "^processor[ \t:]*[0-9]+$" /proc/cpuinfo \
	| tr -d '\t ' \
	| cut -d: -f 2 \
	| tail -n 1 \
	| xargs -n 1 printf "%s + 1\n" \
	| bc -l
)"

#---------------------
# `w` shows each logged in user per line, with two extra lines for the headers. Hence the
# substraction at the end to get the current number of users
logged_users="$(w -is | wc -l | xargs -n 1 printf "%s - 2\n" | bc -l )"

#---------------------
# Current number of processes
num_proc="$(ps --no-headers -e | wc -l)"

# Available memory
mem_avail="$(free -th | tail -n1 | awk '{ print $2 }')"

# Percentage of used memory
mem_usage="$(free |  grep "^Mem:" | awk '{ printf "%05.2f",($3 / $2) * 100 }')"
swap_usage="$(free |  grep "^Swap:" | awk '{
		if ($2 > 0)
		{
			printf "%05.2f",($3 / $2) * 100;
		}
		else
		{
			printf "00.00"
		}
	}'
)"

#---------------------

####
## Prints all the information about the system's network interfaces
####
print_ifaces () {

	ifaces="$(ls /sys/class/net/)"

	for i in $ifaces
	do
		# Some versions of ifconfig say 'inet addr:' and other say 'inet '
		inetaddr="$(ifconfig "$i" \
			| grep -Po "inet (addr:)?([0-9]{1,3}[.]?){4}" \
			| sed -re 's/inet (addr:)?//'
		)"
		inet6addr="$(ifconfig "$i" \
			| grep -Po "inet6( addr:)?[ ][^ ]+" \
			| sed -re 's/inet6( addr:)? //'
		)"

		# Discards the loopback interface and inactive interfaces
		if [ -n "$inetaddr" ] && [ "$inetaddr" != "127.0.0.1" ]
		then
			printf "  %s%s%s:\n" "$CLR_BLUE" "$i" "$CLR_RESET"
			printf "      IPv4: %s%s%s\n" \
				"$CLR_YLLW" "$inetaddr" "$CLR_RESET"

			if [ -n "$inet6addr" ]
			then
				printf "      IPv6: %s%s%s\n" \
					"$CLR_YLLW" "$inet6addr" "$CLR_RESET"
			fi
		fi
	done
}

####
## Prints all the info about the partitions and disks
####
print_disks () {

	for disk in $(lsblk --nodeps --noheadings  | awk '{ print $1 }')
	do
		# Physical disk info
		printf "\n  Physical disk %s%s%s:" "$CLR_GRN" "$disk" "$CLR_RESET"

		printf "\n%s\n\n" "$(
			lsblk --nodeps \
				--output LABEL,RO,MODEL,SIZE,ROTA,TYPE,TRAN,REV,VENDOR \
				/dev/"$disk" \
			| awk '{ printf "      %s\n",$0 }'
		)"

		# A single disk may have multiple partitions, LVM mappings and stuff
		for mountpoint in $(lsblk --output MOUNTPOINT --noheadings "/dev/$disk")
		do

			if [ -n "$mountpoint" ] && [ -d "$mountpoint" ]
			then
				left="$(df -h "$mountpoint" --output=avail \
					| tail -n 1
				)"

				usage="$(df -h "$mountpoint" --output=pcent,size \
					| tail -n 1 \
					| xargs -n 2 printf "%s of %s"
				)"

				printf "      Usage of %s%-30s%s: %s%15s%s (%s%s%s left)\n" \
						"$CLR_BLUE" "$mountpoint" "$CLR_RESET" \
						"$CLR_GRN" "$usage" "$CLR_RESET" \
						"$CLR_YLLW" "$left" "$CLR_RESET"
			fi
		done
	done
}

# String with the usage of the root directory
root_usage_str="$(
	df -h / --output=pcent,size \
	| tail -n 1 \
	| xargs -n 2 printf "%s of %s\n"
)"

#lsblk_partitions="$(lsblk \
#		--inverse --nodeps \
#		--output NAME,MOUNTPOINT,LABEL,RO,MODEL,SIZE,ROTA,TYPE,TRAN,REV,VENDOR
#)"
#lsblk_disks="$(lsblk \
#		--nodeps \
#		--output NAME,LABEL,RO,MODEL,SIZE,ROTA,TYPE,TRAN,REV,VENDOR
#)"


# Prints the temperature of all the ACPI components.
# All the information regarding the temperature of the devices is available
# under /sys/class/thermal
print_temps () {

	cd /sys/class/thermal || return

	printf "\n  %sTemperatures%s:\n" "$CLR_GRN" "$CLR_RESET"

	for zone in thermal_zone*
	do
		# The temperature is stored in miliCelsius
		temp="$(awk '{ printf "%05.2f",($1 / 1000) }' "$zone/temp")"

		# There may be multiple trim points, but usually is only the last when
		# 'trip_point_type = critical', and that is the max temperature that can
		# be reached
		max_temp="$(cat "$zone"/trip_point_*_temp 2>/dev/null \
			| sort -rn \
			| head -n 1 \
			| awk '{  printf "%05.2f",($1 / 1000)  }'
		)"

		printf "    Thermal %s:      " "$(printf "%s" "$zone" \
			| sed 's/[^0-9]//g'
		)"

		if [ -n "$max_temp" ] \
		&& \
		[ "$(printf "%s > (%s * 0.8)\n" "$temp" "$max_temp" | bc -l)" = "1" ]
		then
			printf "%s%s%s ºC" "$CLR_RED" "$temp" "$CLR_RESET"
		else
			printf "%s ºC" "$temp"
		fi

		if [ -n "$max_temp" ]
		then
			printf " (max: %6.2f ºC)\n" "$max_temp"
		else
			printf " (max: N/A)\n"
		fi

	done
}




#----------------------------------------------------------------------------------------
#----------------------------------------------------------------------------------------
#----------------------------------------------------------------------------------------
# Prints all the information
#----------------------------------------------------------------------------------------
#----------------------------------------------------------------------------------------
#----------------------------------------------------------------------------------------


# ---- First section: CPU stats ----
printf " %sCPU STATS%s\n" "$CLR_GRN" "$CLR_RESET"
# First line
printf "  %sSystem load%s:      " "$CLR_BLUE" "$CLR_RESET"

# Adds colour for an overloaded system
if [ "$(printf "%s > 1\n" "$sysload" | bc -l)" = "1"  ]
then
	printf "%s" "$CLR_RED"

elif [ "$(printf "%s > 0.8\n" "$sysload" | bc -l)" = "1" ]
then
	printf "%s" "$CLR_YLLW"
fi
printf "%-15s" "$sysload"

printf "  %sProcesses%s:        %-15s\n" "$CLR_BLUE" "$CLR_RESET" "$num_proc"

# Second line
printf "  %sN. of CPUs%s:       %-15s" "$CLR_BLUE" "$CLR_RESET" "$num_cpus"
printf "  %sUsers logged in%s:  %-15s\n" "$CLR_BLUE" "$CLR_RESET" "$logged_users"

# Third line
printf "  %sUptime%s:           %-15s\n" "$CLR_BLUE" "$CLR_RESET" "$uptime"

# Temperatures
print_temps


#--------------------------------------
printf "%s%60s\n" "$CLR_RESET" " " | tr " " "-"
#--------------------------------------

# ---- Second section: Memory stats ----
printf " %sMEMORY STATS%s\n" "$CLR_GRN" "$CLR_RESET"

# First line
printf "  %sMemory + Swap%s:    %-15s" "$CLR_BLUE" "$CLR_RESET" "$mem_avail"
printf "  %sMemory usage%s:     " "$CLR_BLUE" "$CLR_RESET"
# Adds colour for an overloaded system
if [ "$(printf "%s > 80\n" "$mem_usage" | bc -l)" = "1"  ]
then
	printf "%s" "$CLR_RED"

elif [ "$(printf "%s < 50\n" "$mem_usage" | bc -l)" = "1" ]
then
	# Infrautilised
	printf "%s" "$CLR_YLLW"
fi
printf "%-15s\n" "$mem_usage %"

# Second line
printf "                                   "
printf "  %sSwap usage%s:       " "$CLR_BLUE" "$CLR_RESET"
# Adds colour for an overloaded system (any swap usage is a system overloaded)
if [ "$(printf "%s > 0\n" "$swap_usage" | bc -l)" = "1"  ]
then
	printf "%s" "$CLR_RED"

elif [ "$(printf "%s == 0\n" "$swap_usage" | bc -l)" = "1" ]
then
	printf "%s" "$CLR_GRN"
fi
printf "%-15s\n" "$swap_usage %"

#--------------------------------------
printf "%s%60s\n" "$CLR_RESET" " " | tr " " "-"
#--------------------------------------

# ---- Third section: Disks ----
printf " %sDISKS%s\n" "$CLR_GRN" "$CLR_RESET"

# First line
printf "  %sUsage of /%s:       %-15s\n" "$CLR_BLUE" "$CLR_RESET" "$root_usage_str"

# Disks
print_disks

#--------------------------------------
printf "%s%60s\n" "$CLR_RESET" " " | tr " " "-"
#--------------------------------------

# ---- Fourth section: Networking ----
printf " %sNETWORKING%s\n" "$CLR_GRN" "$CLR_RESET"
print_ifaces