Use<\/p>\n
\r\ndate '+%FT%T.%N'\r\n<\/pre>\n<\/p>\n
Sample output:<\/p>\n
\r\n2024-02-05T22:27:08.064175582\r\n<\/pre>\nThat is sortable output, but a resolution of 1\/100 second is probably sufficient. The output can be rounded by postprocessing. For example (properly rounded, not just truncated),<\/p>\n
\r\ndate '+%FT%T.%N' | perl -nle '($secRes, $ns) = split(\/\\.\/); $rounded = sprintf("%.2f", $ns \/ 1000000000); $rounded =~ s\/^0\/\/; printf("$secRes$rounded")'\r\n<\/pre>\nSample output:<\/p>\n
\r\n2024-02-05T22:27:08.06\r\n<\/pre>\nNotes:<\/p>\n
For example, it can be used to get absolute timestamps for start and end of a command (not just the run time in seconds):<\/p>\n
\r\nclear; echo ; echo "Start time: $(date '+%FT%T.%N' | perl -nle '($secRes, $ns) = split(\/\\.\/); $rounded = sprintf("%.2f", $ns \/ 1000000000); $rounded =~ s\/^0\/\/; printf("$secRes$rounded")')" ; echo\r\ngit log -i -S"Q10 Max" --all -- keyboards\r\nclear; echo ; echo "End time: $(date '+%FT%T.%N' | perl -nle '($secRes, $ns) = split(\/\\.\/); $rounded = sprintf("%.2f", $ns \/ 1000000000); $rounded =~ s\/^0\/\/; printf("$secRes$rounded")')" ; echo\r\n<\/pre>\nThe absolute time may be important later. For example, to know\/document when a particular command was run (and how long it took).<\/p>\n
References<\/h2>\n\n- Hacker Public Radio<\/a> episode 4678: High resolution elapsed time in shell scripts<\/em><\/a>. For example, at 12 min 59 secs, near “we can use the date command”<\/em> in the transcript. Direct download URL<\/a> (save it with the .ogg<\/em><\/a> filename extension, for example, HPR4678.ogg<\/em>)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
Use Sample output: That is sortable output, but a resolution of 1\/100 second is probably sufficient. The output can be rounded by postprocessing. For example (properly rounded, not just truncated), Sample output: Notes: The enclosing single quotes can be left …<\/p>\n