From f8b4b38b4f52dc4cc9722cc4ce68814cb79dc7f3 Mon Sep 17 00:00:00 2001 From: eliot Date: Mon, 25 May 2020 22:42:41 +0200 Subject: [PATCH] --- linux-intro/linux_exam2020.txt.mdwn | 189 ++++++++++++++++++++++++++++ 1 file changed, 189 insertions(+) create mode 100644 linux-intro/linux_exam2020.txt.mdwn diff --git a/linux-intro/linux_exam2020.txt.mdwn b/linux-intro/linux_exam2020.txt.mdwn new file mode 100644 index 0000000..cc84ca2 --- /dev/null +++ b/linux-intro/linux_exam2020.txt.mdwn @@ -0,0 +1,189 @@ + #!/bin/bash -e + #For course FYD500, exam 2020 + #No warranty provided + + # Price checker for imaginary items, has fake discount for elderly. + # CTRL+C (SIGINT) enters admin mode which shows some host information, + # assuming the correct password is supplied (read from file techpasswd)" + + ### PROVIDED FUNCTIONS ### + function user_mode { + #terminal location provided by customer + LOCATION=$1 + OPTION_1="Price Information" + OPTION_2="Senior Rebate" + + echo " + 1) $OPTION_1 + 2) $OPTION_2" + + #select output gets sent to stderr for some reason? + select OPTION in "$OPTION_1" "$OPTION_2" + do + case $OPTION in + "$OPTION_1") + price_info + ;; + "$OPTION_2") + senior_rebate + ;; + *) ;; + esac + done + } + + function price_info { + while : + do + echo -e "Enter an article number: " + read ARTICLE + + #article code length (includes '\n') + let ARTICLE_LEN="$(echo "$ARTICLE" | wc -m )" + if [ ! $ARTICLE_LEN -eq "8" ]; then + echo "Invalid length of article code" + echo "Expected 7, got $ARTICLE_LEN" 1>&2 + echo + continue + fi + + LOCATION_CODE="${ARTICLE:0:1}" + PRICE_CODE="${ARTICLE:1:5}" + CHECKSUM="${ARTICLE:6:6}" + + #Check if item location matches store location + ERROR=0 + PRICE_MULTIPLIER="1" + if [ "$LOCATION" = "G" ]; then + if [ ! "$LOCATION_CODE" = "1" ]; then ERROR=1; fi + elif [ "$LOCATION" = "S" ]; then + #Stockholm tax + PRICE_MULTIPLIER="1.15" + if [ ! "$LOCATION_CODE" = "2" ]; then ERROR=1; fi + elif [ "$LOCATION" = "M" ]; then + if [ ! "$LOCATION_CODE" = "3" ]; then ERROR=1; fi + else + ERROR=1 + fi + + if [ "$ERROR" -eq "1" ]; then + echo "Invalid location article code combination!" + continue + fi + + #checksum should be sum of digits modulus 7 + EXPECTED_CHECKSUM=$(echo "$PRICE_CODE" |\ + awk 'BEGIN{FIELDWIDTHS="1 1 1 1 1"}{print ($1+$2+$3+$4+$5)%7}') + + if [ ! $CHECKSUM -eq $EXPECTED_CHECKSUM ]; then + echo "Invalid checksum!" 1>&2 #error + echo -e "Invalid article\n" + continue + fi + + case "$PRICE_CODE" in + "64964") + PRICE=$(awk "BEGIN {print 120*${PRICE_MULTIPLIER}}") + echo -e "$ARTICLE (USB stick): $PRICE kronor\n" + ;; + "59457") + PRICE=$(awk "BEGIN {print 400*${PRICE_MULTIPLIER}}") + echo -e "$ARTICLE (headset): $PRICE kronor\n" + ;; + *) + echo -e "Hm, well I can't seem to find the product ($ARTICLE) in our system!\n" + ;; + esac + done + } + + function senior_rebate { + BIRTHDAY="" + + #Require 8 chars AND all digits + while [ ! ${#BIRTHDAY} -eq 8 ] || [ ! -z "${BIRTH_YEAR##*[!0-9]*}" ] + do + echo -e "Enter your birthday (YYYYMMDD)" + read BIRTHDAY + done + + CURRENT_DATE=$(date +"%Y%m%d") + let AGE=$CURRENT_DATE-$BIRTHDAY + #Age in years + AGE=${AGE:0:2} + + if [ $AGE -gt 64 ]; then + echo "CONGRATULATIONS YOU ARE SENIOR REBATE ELIGABLE!" + else + echo "Good try kid, come back later" + fi + } + + function tech_mode { + #ignore SIGINT signals + trap "" SIGINT + #Reset errors to tty + exec 2>/dev/tty + #Errors and warnings goes to both TTY and file + exec > >(tee admin.log) + + FILE="techpasswd" + + if [[ ! -f "$FILE" ]]; then + echo "ERROR: password file not found" 1>&2 + sleep 10 + return + fi + + echo "Enter secret password:" + read PASSWORD + + if [ "$PASSWORD" = "$( cat $FILE )" ]; then + echo "CPU Model: $( lscpu | awk -F: '/Model name/ { print $2 }' | sed 's/^ *//g' )" + + echo "Processes over 5000kB RSS: $(ps -eo rss --sort=-rss | awk '{ if ( $1 > 5000 ) {sum+=1}} {print sum}' | tail -n 1)" + + echo "System was last updated: $( stat /etc/redhat-release | awk '/Modify/ { print $2 " " $3 " (" $4 ")" }' )" + + else + echo "Incorrect password" 1>&2 + sleep 10 + fi + + return + } + + function help { + echo -e "\\033[1m${0}\\033[0m usage: + \\e[0;31m-h\\e[0m Prints this help + \\e[0;31m-shop G/S/M\\e[0m Enter shop by specifying city Gothenburg, Stockholm, Malmo. Exactly one additional argument is required G, S, or M. + + Any other input will result in the printing of this help screen." + } + + + ### PROGRAM STARTS HERE ### + + #Hide errors from user, send to log file + exec 2>file.log + + #CTRL+C triggers admin mode (requires password) + trap "tech_mode" SIGINT + + #0-1 arguments always shows help + if [ $# -lt 2 ]; then + help + #2 arguments check whether user wants to enter shop + elif [ $# -eq 2 ]; then + case $1 in + "-shop") + user_mode $2 + ;; + *) + help + ;; + esac + #Too many arguments show help + else + help + fi -- 2.39.2