In blackbox testing, we can use diff command to check an output file against expected results. To check standard output during unit testing, we can use a mock stdout and stderr to capture any outputs.

Using unittest module …

To Bash or not to Bash

Writing shell scripts can automate command execution and help us become more productive. Bash is the default shell for most linux distributions.

Which Bash

Check that your have Bash installed.

$ which bash …

Syntax

grep [OPTION...] PATTERNS [FILE...]
grep [OPTION...] -e PATTERNS ... [FILE...]
grep [OPTION...] -f PATTERN_FILE ... [FILE...]

The grep command takes in text from stdin or a file.

Quick Examples

The lady with the …