arzzen / pert

A simple command line (bash/shell) utility to estimate tasks using PERT [Program Evaluation and Review Technique]

Bash PERT Calculator

A simple utility to estimate tasks using PERT (Program evaluation and review technique)

Demo

Usage

Comma separated task list in the form "1,2,12 4,5,9 2,3,6", where whitespace separates tasks. (or you can use piping inputs echo "1,2,3 10,30,40" | pert)

Usage:

pert [optimistic,realistic,pessimistic]

Example:

pert 1,3,4

pert 10,15,20 5,7,10

pert "1,2,3" "15,17,20"

cat data.txt | pert

echo "1,2,3 9,10,14" | pert

Install

$ git clone https://github.com/arzzen/pert.git && cd pert
$ sudo make install

For uninstalling, open up the cloned directory and run

sudo make uninstall

Example

Command:

$ ./pert 5,7,10 2,3,4 10,12,14

Output:

Tasks

 +--------------------------------------------------------------------------------------+
 | #            | optimistic | realistic | pessimistic | duration |     risk | variance |
 +--------------------------------------------------------------------------------------+
 | 1. task      |          5 |         7 |          10 |     7.16 |     0.83 |     0.68 |
 | 2. task      |          2 |         3 |           4 |     3.00 |     0.33 |     0.10 |
 | 3. task      |         10 |        12 |          14 |    12.00 |     0.66 |     0.43 |
 +--------------------------------------------------------------------------------------+
 | summary      |          - |         - |           - |    22.16 |     1.82 |     1.21 |
 +--------------------------------------------------------------------------------------+

Three point estimates

 +----------------------------------------+
 | confidence    |            |           |
 +----------------------------------------+
 | 1 Sigma - 68% |      20.34 |     23.98 |
 | 2 Sigma - 95% |      18.52 |     25.80 |
 | 3 Sigma - 99% |      16.70 |     27.62 |
 +----------------------------------------+