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Pipes: Chain Commands

Pipes connect commands. Output of one becomes input of next.

Here's the thing: Pipes chain commands. Powerful. Use them.

Basic Pipe​

command1 | command2

My take: | pipes output. Simple.

Common Patterns​

Filter​

ls -l | grep ".txt"

Count​

ls | wc -l

Sort​

cat file.txt | sort

Pipeline Failures​

set -o pipefail
command1 | command2

My take: pipefail catches failures in pipes. Use it.

Common Patterns​

Long Pipeline​

cat file.txt | grep "pattern" | sort | uniq

What's Next?​

Now that you understand pipes, let's talk about File Descriptors.

Personal note: Pipes seemed simple at first. Then I learned they're powerful. Now I use them constantly. They're essential. Learn them.