ts

Add timestamps to every line from stdin. More information: https://joeyh.name/code/moreutils/.

• Add a timestamp to the beginning of each line:

command | ts

• Add timestamps with microsecond precision:

command | ts "%b %d %H:%M:%.S"

• Add incremental timestamps with microsecond precision, starting from zero:

command | ts -i "%H:%M:%.S"

• Convert existing timestamps in a text file (eg. a log file) into relative format:

cat path/to/file | ts -r