Inserting timestamps into stream in bash

Question

I have a stream of data I'm receiving on stdin and I would like to add timestamps onto the steam. Ideally every line I would like to replace the new line with the current epoch seconds

... | sed "s/$/$(date +' %s')"/ won't work because it will just evaluate the date command once on command.

What can I do?

https://unix.stackexchange.com/questions/56189/appending-timestamp-stamp-along-with-log-file-lines — Zael, Jul 17 '18 at 15:19

score 3 · Accepted Answer · answered Nov 21 '16 at 23:32

3

depending on your OS, you could

use the ts command: this will put the timestamp at the beginning of the line
```
... | ts '%s'
```
use GNU awk
```
... | gawk '{print $0, systime()}'
```
or perl
```
... | perl -lpe '$_ .= " ".time'
```

answered Nov 21 '16 at 23:32

glenn jackman

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score 0 · Answer 2 · edited May 23 '17 at 10:30

0

I can't flag this as a duplicate or comment on it, but take a look at the same question asked here before: Is there a Unix utility to prepend timestamps to stdin?

From there, you can use either ts (which has to be installed via apt-get install moreutils) or awk.

edited May 23 '17 at 10:30

Community

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answered Nov 21 '16 at 23:31

edaemon

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Inserting timestamps into stream in bash

2 Answers2