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I have a log file like Blah blah blah 2018-12-13. Now I want to grep the log files with a date before 2018-05-01. My intention is to filter the Log files lesser than 2018-05-01

closed as unclear what you're asking by Michael Homer, techraf, Satō Katsura, Archemar, countermode Oct 26 '16 at 8:14

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    does the date always occur at end of line? try awk '$NF < "2018-05-01"' – Sundeep Oct 26 '16 at 6:08
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    Add an example chunk, and your desired output from that. – heemayl Oct 26 '16 at 6:11
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    Is the spring "Blah blah blah 2018-12-13" a line in a log file or a name of a file? – Anton Leontiev Oct 26 '16 at 7:07
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We can use awk's comparison operator

$ cat ip.txt 
Blah blah blah 2018-12-13
Blah blah blah 2018-02-13
Blah blah blah 2018-05-01

$ awk '$NF < "2018-05-01"' ip.txt 
Blah blah blah 2018-02-13


To get lines less than or equal to some date:

$ awk '$NF <= "2018-05-01"' ip.txt 
Blah blah blah 2018-02-13
Blah blah blah 2018-05-01
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Using dategrep from dateutils, http://www.fresse.org/dateutils/

dategrep '<2018-05-01' <file

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