Question

linux: regular expressions

file name: studentsyslog.txt

Use a regular expression and grep or egrep to filter the file so the output displays only the items requested. Put your full command in the space provided.

1. Display only the lines that were written to the file between the times of 12:55 and 12:59 (inclusive). This is tricky. Don’t think of these times as numbers, think of these times as a series of characters (a 1 followed-by a 2 followed-by a colon, etc.)

Answer 1

solution:

given data:

linux: regular expressions

grep command is used to search for a string of characters in a specified file. The text search pattern is called a regular expression

-E controls whether you need to escape certain special characters

The -E is needed to have grep understand | (alternation) in the expression (this alternation makes it an extended regular expression)

If you have any doubts or need ay modifications, please let me know.

grep -E '12:(55|56|57|58|59)' studentsyslog.txt

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