94 lines
No EOL
2.3 KiB
Bash
Executable file
94 lines
No EOL
2.3 KiB
Bash
Executable file
#!/bin/bash
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# help text
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if [ -z "$1" ] || [[ "$1" =~ [-]*(help|h) ]]; then
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echo -e "\nA command line PERT calculator for quick estimates."
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echo -e "\nComma separated task list in the form \"1,2,12 4,5,9 2,3,6\", where whitespace separates tasks."
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echo -e "\nUsage:\n\tpert [optimistic,realistic,pessimistic]\n"
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echo -e "Example:"
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echo -e "\tpert 1,3,4"
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echo -e "\tpert 10,15,20 5,7,10"
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echo -e "\tpert \"1,2,3\" \"15,17,20\"\n"
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exit 1
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fi
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# helper
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function _calc
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{
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scale=2
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echo "scale=$scale; $@" | bc -l | sed 's/^\./0./'
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}
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function _divider
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{
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divider=------------------------------
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divider=" "$divider$divider$divider
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width=85
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printf "%$width.${width}s\n" "$divider"
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}
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header="\n %-12s |%11s |%10s |%12s |%9s |%9s |%9s\n"
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format=" %-12s |%11s |%10s |%12s |%9s |%9s |%9s\n"
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counter=0
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total_estimate=0
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total_standard_deviation=0
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total_variance=0
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for var in "$@"; do
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# counter iterator
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counter=$[$counter +1]
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# split values
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IFS=',' read -ra ADDR <<< "$var"
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# optimistic value
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o=${ADDR[0]}
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# realistic value
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r=${ADDR[1]}
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# pessimistic value
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p=${ADDR[2]}
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# header
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if [[ $counter = 1 ]]; then
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printf "$header" "#" "optimistic" "realistic" "pessimistic" "duration" "risk" "variance"
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_divider
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fi
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# check values
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if [ -z "$o" ] || [ -z "$r" ] || [ -z "$p" ]; then
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printf "$format" "$counter. bad input" $o $r $p
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else
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# pert estimate
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pert_estimate=$(_calc "($o+4*$r+$p)/6")
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total_estimate=$(_calc "$total_estimate + $pert_estimate")
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# standard deviation
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standard_deviation=$(_calc "($p-$o)/6")
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total_standard_deviation=$(_calc "$total_standard_deviation + $standard_deviation")
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# variance
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variance=$(_calc "$standard_deviation * $standard_deviation")
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total_variance=$(_calc "$total_variance + $variance")
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# row
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printf "$format" "$counter. task" $o $r $p $pert_estimate $standard_deviation $variance
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fi
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done
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if [[ $total_estimate > 0 ]]; then
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# footer
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_divider
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printf "$format" "summary" "-" "-" "-" $total_estimate $total_standard_deviation $total_variance
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#echo -e "\nThree point estimate:"
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fi
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echo -e "\n" |