seep

Print stdin to terminal, then pipe into next process.

seep (short for see pipe) has the purpose of letting you peek at what you're piping.

Usage

On Unix like systems, you can pass the output (stdout) of one process to the other as input, like this: echo "foo" | hexdump. In some cases, the output of the first command might contain information that a user might want to look at.

When the second process does not show the information it received, the user cannot see the information produced by the first program. This is where seep comes useful:

To look at the output of process one, we pipe it to seep and then pipe the output of seep to process two. seep will show us what information it receives and pass it over to process two:

ls | seep | grep src

(list files and dirs, show all with seep, show only containing "src")