Terminal Exercises - sandbox.bio

Terminal Exercises

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Pipes and Filters

Which pipe?

Consider the file exercise-data/animal-counts/animals.csv:

2012-11-05,deer,5
2012-11-05,rabbit,22
2012-11-05,raccoon,7
2012-11-06,rabbit,19
...

The uniq command has a -c option which gives a count of the number of times a line occurs in its input.

What command would you use to produce a table that shows the total count of each type of animal in the file?

sort animals.csv | uniq -c

sort -t, -k2,2 animals.csv | uniq -c

cut -d, -f 2 animals.csv | uniq -c

cut -d, -f 2 animals.csv | sort | uniq -c

cut -d, -f 2 animals.csv | sort | uniq -c | wc -l

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Introduction

Terminal Exercises

Navigating Files and Directories

Absolute vs relative paths

Absolute vs relative paths

Ls reading comprehension

Working With Files and Directories

Moving Files to a new folder

Renaming Files

Moving and Copying

List filenames matching a pattern

Pipes and Filters

Appending data

Piping commands together

Pipe construction

Which pipe?

Removing unneeded files

Loops

Write your own loop

Limiting sets of files

Saving to a file in a loop

Saving to a file in a loop - part 2

Shell Scripts

List unique species

Variables in shell scripts

Longest file with a given extension

Finding Things

Using grep

Tracking a species

Little women

Matching and subtracting

The end

The end