Pull a column and change its case

Goal

The file testdata/people.csv is comma-separated. Print the first field of every line, uppercased, one per line.

Example

If testdata/people.csv held:

dana,28,seattle
erin,33,boston

your script prints:

DANA
ERIN

One line of output per line of input, in the same order. If a line's first field is empty, print an empty line.

Rules

• Edit answer.sh. Read testdata/people.csv; do not hard-code the names.
• The separator is a comma. Field 1 is the first field, counting from 1. Every line has at least one comma.
• Uppercase the output, whatever case the names are in.
• Print no header and no extra lines.

What you'll practice

cut -d ... -f 1, tr 'a-z' 'A-Z', and piping one command into another.

Run it

gonomicon fetch week-1/03-02-cut-and-tr-column-case
cd 03-02-cut-and-tr-column-case
gonomicon test
gonomicon submit

Hints

1. cut -d "," -f 1 keeps the first comma-separated field of every line.
2. tr 'a-z' 'A-Z' turns each lowercase letter into uppercase.
3. Pipe the two together: cut -d "," -f 1 testdata/people.csv | tr 'a-z' 'A-Z'.