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Bash script to print duration of current linux installation
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#!/bin/bash | |
# Function to check if leap year exists in order to print exact year number | |
function is_leap { | |
if !(($1 % 4)) && ( (($1 % 100)) || !(($1 % 400)) ); then | |
echo 1 | |
else | |
echo 0 | |
fi | |
} | |
# Function to convert seconds to human readable format, inspired by https://unix.stackexchange.com/a/27014 | |
function displaytime { | |
local T=$1 | |
local D=$((T/60/60/24)) | |
local H=$((T/60/60%24)) | |
local M=$((T/60%60)) | |
local S=$((T%60)) | |
# check for leap years in between install year and current year | |
local Y=0 | |
if [[ $D -gt 0 ]]; then | |
for (( i = $2; i < $3; i++ )); do | |
Y=$((Y+1)) | |
if [[ $(is_leap $i) -eq 1 ]]; then | |
D=$((D-366)) | |
else | |
D=$((D-365)) | |
fi | |
done | |
(( $Y > 0 )) && printf '%d years ' $Y | |
fi | |
(( $D >= 0 )) && printf '%d days ' $D | |
(( $H > 0 )) && printf '%d hours ' $H | |
(( $M > 0 )) && printf '%d minutes ' $M | |
(( $D > 0 || $H > 0 || $M > 0 )) && printf 'and ' | |
printf '%d seconds\n' $S | |
} | |
#What distribution flavor is active? | |
distro_flavor=$(grep "ID_LIKE=" < /etc/os-release | cut -d '=' -f2 | sed -e 's/^"//' -e 's/"$//' | cut -d ' ' -f1) | |
case "${distro_flavor}" in | |
arch ) | |
INSTALL_DATE=$(awk 'NR==1{gsub(/\[|\]/,"");print $1,$2}' /var/log/pacman.log) | |
;; | |
rhel|fedora ) | |
INSTALL_DATE=$(rpm -q basesystem --qf '%{installtime:date}\n' ) | |
;; | |
* ) | |
INSTALL_DATE=$(ls -lact --full-time /etc |awk 'END {print $6,$7,$8}') | |
;; | |
esac | |
INSTALL_YEAR=$(date --date "$INSTALL_DATE" +%Y) | |
INSTALL_EPOCH=$(date --date "${INSTALL_DATE}" +%s) | |
CURRENT_EPOCH=$(date +%s) | |
CURRENT_YEAR=$(date +%Y) | |
ELAPSED_EPOCH=$((CURRENT_EPOCH-INSTALL_EPOCH)) | |
displaytime $ELAPSED_EPOCH $INSTALL_YEAR $CURRENT_YEAR |
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