![]() ![]() Getting duration from start and and times and dates (without Date module) 8. Financial Calculators & time/date stamps. grep ' 21:' log.txt tail -f log.txt It will print everything from that hour, and keep tailing. Need help With Date and Time Stamps on a File. ![]() The timestamp is then added onto the boottime value and rounded back to an integer using sprintf("%. 4 Answers Sorted by: 8 You can just use combination of grep and tail in oneliner. The time stamp is extracted using a substring command, ignoring the substr($0, RSTART+1, RLENGTH-2) The AWK match command is used to find the timestamp with a format of Īfter a regex match the RSTART and RLENGTH variables hold the start and length of matched chars. The boot time line (btime) is read from /proc/stat and the time extractedīoottime=$(echo $(grep -m1 "btime" /proc/stat) | grep -Eo "*$") The best I achieved was if file 'a' gets moved then original file will be deleted along with all the other files in the folder. original file gets moved into different folder e.g archive. original file in folder a gets deleted or 2. Create a timestamp We can create a DateTime object representing the current date and time by calling the now constructor. This reads the time the system booted and stores it in a variable, then parses the log extracting the timestamp of each line adding it on to the boot time, formatting it to a date time string and writing it out with the rest of the line. But the original file in folder 'a' does not get removed. So I revised the script and converted it to native bash in the process: dmesg_with_human_timestamps () ' For example, on a particular CentOS 6.6 box here: # grep "\.clock" /proc/sched_debug | head -1ġ5:54:05 up 371 days, 19:09, 4 users, load average: 3.41, 3.62, 3.57Īccounting for the CPU uptime being in milliseconds, there's an offset of nearly 5 1/2 hours here. There are two types of specifiers, one is for. As a result, the most accurate conversion for recent dmesg entries will be based on the CPU clock rather than /proc/uptime. The Perl POSIX strftime() function is used to format date and time with the specifiers preceded with () sign. Over time this gets out of sync with the real time clock. Turns out that kernel timestamps in dmesg are derived from an uptime value kept by individual CPUs. It has a bit of trouble with some of our boxes with large uptime though. ![]() For systems without "dmesg -T" such as RHEL/CentOS 6, I liked the "dmesg_with_human_timestamps" function provided by lucas-cimon earlier. ![]()
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