Emit marker into stdout on receipt of signal. Designed to run in a shell, wrapping another program's output via a pipe.

Loosely modeled after https://github.com/firesock/pipe-marker.

Usage

Pre-requisites

Install the Go toolchain - refer to your environment's package manager for specifics.

Clone this repository.

Build and install the binary

Run this from the repository root:

go install

Output should be under your $GOPATH/bin (or $GOBIN, if set).

Use in a pipe

Replacing with real paths, enter into a terminal window:

/path/to/noisy-program | $(go env GOPATH)/bin/pipe-marker-go -enabled

Send signals

While running, from another terminal window, send signals to place markers in the stream.

Supported signals: SIGUSR1, SIGUSR2.

Markers to look for: ===USR1===, ===USR2===.

pid=$(ps -eo pid,comm | grep pipe-marker-go | awk '{print $1}' | head -n1)
kill -s USR1 $pid