orzzzl / csv_master

A terminal-based program to handle csv-file

csv_master

This is a terminal-based program to handle csv-file.

Compile:

You can simply type "make" to compile, but note that you must have a g++ compiler which
surport C++11 to compile this program.

Usage:

This command goes as follows

Note that all number appears in this program is 0-indexed!!

./csv_master [-p (colume numbers)] [-c (expression)] [-o (output file-name)] [-s (colume numbers)]
[-j (colume on join)] [-O] [-h] [file-name which be joined with] input-file-name

I'll explain each option in the following "Features Section"

Features:

1. Select some certain line using -s, you can either use ',' saperated notation or '-' notation.
   For example, if the original csv file is:

sample.csv:

1,3,4,5
2,3,1,2
2,6,2,1

And you want to select colume 0,1,2
You can either do ./csv_master -s 0-2 -o output.txt sample.csv
or ./csv_master -s 0,1,2 -o output.txt sample.csv

Note that if you don't use -o to specified a name the default output file name will be csv_master.out

2. Perform arithmetic operations and create a new colume. For example:
   

sample.csv:

1,3,4,5
2,3,1,2
2,6,2,1

If you do ./csv_master -c 0+2 -o output.txt sample.csv
Then it will add each number in colume 0 with each number in colume 2 and create a new colume.
The resule will be:

line 0 1 2 3 new
0: 1 3 4 5 5.000000
1: 2 3 1 2 3.000000
2: 2 6 2 1 4.000000

Also note that to multiply it's col1xcol2 instead of col1*col2

3. Output statistics on a column: min, max, median and average
   You can either do ./csv_master -p 0-2 -o output.txt sample.csv
   or ./csv_master -p 0,1,2 -o output.txt sample.csv
   

The result of the stats of selected colume will goes to standard output.

4. Perform an outer and inner join on two data sets
   You can use -j colnumber option to do join using colnumber as a key.
   If you want to do outer join, you should specify using -O options.
   If not specified, the default way is inner join.
   

For example:
If you want to inner join f1.csv and f2.csv, using the 0th colume as key word, do:
./csv_master -j 0 -o output.txt f1.csv f2.csv

outer join:
./csv_master -j 0 -o output.txt -O f1.csv f2.csv

5. Other features:
   You can use -h to specify if the csv file has a header line at the top.
   If not, csv_master will auto-add names using 0-index colume number as the name.