How do I grep time in a log file?
I suggest you do:
- Press CTRL + ALT + T .
- Run the command ( -E for extended regex): sudo grep -E ‘2019-03-19T09:3[6-9]’
What is timestamp in log file?
Two timestamps separated by a hyphen (-). The first time stamp is a lower bound for the time stamp of the first record in the log file. The lower bound is the time when the new buffer for log records is created. The second time stamp indicates a date and time of year 2000, month September, and day 13 at 12:00 noon.
How do you grep a log file within a specific time period?
3 Answers
- The first ^ means “start of the line”.
- [^ ]+ just matches the date field, regardless of the actual date. […] means “any character between the brackets”, so [89] will match either 8 or 9 ; [0-9] is any number, and [^ ] is anything except a space (because of the ^ inside brackets).
- (… |…
How do you use wildcards with grep?
Using the star sign in grep
- grep itself doesn’t support wildcards on most platforms. You have to use egrep to use wildcards.
- @PanCrit: * means the same thing in grep and egrep: it’s a quantifier meaning zero or more of the preceding atom.
- @AlanMoore Thanks for the update.
How to extract log lines of specific dates?
For example, to get the logs for specific date and time based on the date format on the log file, for example, 8th April, 09:22; To get the lines of specific date range, say from April 6th to April 7th; Next, let us see how to use grep to extract log lines of specific dates on a log file.
How to print dates from a log file?
The above, as you can see prints all the lines from the specified first date up to including the only the first line of the specified last date. If there are more than one line of the last date specified in the range, then you need to include the next date after the specified last date in the range and delete the last line.
When to delete the last line in a log file?
If there are more than one line of the last date specified in the range, then you need to include the next date after the specified last date in the range and delete the last line. For example, to print lines from April 7th to April 8th;
How to print all lines in a log file?
In this case it will print every line it finds between the string Feb 23 13:55 and the string Feb 23 14:00. will return all logs lines between 19:31 and 19:35 on 31/Mar/2002.