Linux shell programming extraction character and statistics

Extraction of characters and statistics in Linux shell programming 1. Assume that the format of a bb file is as follows: www.2cto.com currently requires to extract the above part of the red body, which can be achieved through the following command: grep aa.png bb | cut-d \ "-f6 2. Assume that the format of a bb file is as follows: www.2cto.com

To obtain the red part, run the following command: grep aa.png bb | cut-d \ "-f4 | cut-sd/-f3 3. Take as an example. The requirements are as follows: the aa.png time format is "23/Apr/2011. The operation is as follows: grep aa.png bb | sed's, [^ [] * \ [,; s ,:. *, '| uniq-c first searches for aa.png in the bb文, then deletes characters other than "day/month/year", and finally counts the number of occurrences.