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.Show only the lines that end with an ellipses (3 dots) :

Answer 1

grep '\.\.\.$' studentsyslog.txt

Grep is aLinux / Unix command-line tool used to search for a string of characters in a specified file

grep uses regexes; . means "any character". So we need to escape the dots in order to find dots in the file. We have used three dots in the command so we escape then by backword slash like this '\.\.\.'

In regular expressions, we use $ to match a word/words at the end of a line.

Here we use this to mach the dots.

Like this: '\.\.\.$' which will match 3 dots at the end of each line.

The syntax for code is:

grep regularexpression filename

Here is the command with output:

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