Tool for adding timestamps to a stream of lines from stdin.
A good example for using ts is to annotate a docker build output with timestamps or step durations:
$ docker build . | docker run -i goeven/ts -d
0s Sending build context to Docker daemon 79.87kB
0s Step 1/7 : FROM golang:1.15-alpine as build
2.301s 1.15-alpine: Pulling from library/golang
691ms 801bfaa63ef2: Pulling fs layer
0s ee0a1ba97153: Pulling fs layer
0s 1db7f31c0ee6: Pulling fs layer
0s ecebeec079cf: Pulling fs layer
0s 63b48972323a: Pulling fs layer
5ms ecebeec079cf: Waiting
0s 63b48972323a: Waiting
699ms ee0a1ba97153: Verifying Checksum
0s ee0a1ba97153: Download complete
4ms 1db7f31c0ee6: Verifying Checksum
1ms 1db7f31c0ee6: Download complete
57ms 801bfaa63ef2: Verifying Checksum
0s 801bfaa63ef2: Download complete
200ms 801bfaa63ef2: Pull complete
149ms ee0a1ba97153: Pull complete
75ms 1db7f31c0ee6: Pull complete
176ms 63b48972323a: Verifying Checksum
0s 63b48972323a: Download complete
2.836s ecebeec079cf: Verifying Checksum
0s ecebeec079cf: Download complete
5.202s ecebeec079cf: Pull complete
73ms 63b48972323a: Pull complete
12ms Digest: sha256:49b4eac11640066bc72c74b70202478b7d431c7d8918e0973d6e4aeb8b3129d2
5ms Status: Downloaded newer image for golang:1.15-alpine
4ms ---> 1463476d8605
0s Step 2/7 : WORKDIR /src
665ms ---> Running in af27aec81c47
109ms Removing intermediate container af27aec81c47
0s ---> 1d9f17228361
0s Step 3/7 : ADD . .
166ms ---> e6747312362f
0s Step 4/7 : RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags="-w -s" -o /usr/local/bin/ts .
39ms ---> Running in c1bdab7de3ac
8.439s Removing intermediate container c1bdab7de3ac
0s ---> fcdd96453f10
0s Step 5/7 : FROM scratch
0s --->
0s Step 6/7 : COPY --from=build /usr/local/bin/ts /usr/local/bin/ts
209ms ---> 557e2a332c0d
0s Step 7/7 : ENTRYPOINT [ "/usr/local/bin/ts" ]
38ms ---> Running in 8e71999a8297
79ms Removing intermediate container 8e71999a8297
0s ---> 82d370adecfb
2ms Successfully built 82d370adecfb