Linux Lab questions

Question

Write the command that would find all lines that have an email address and place a label email = before the line in the file longfile

You would be searching for lines with the words from: to: Cc:, To:, cc: usually after these characters, there could be a good, valid e-mail address.

YOUR AWK COMMAND:

Answer 1

The AWK command to find all lines that have an email address and place a label "email =" before the line in the file longfile can be:

awk '/(from:|to:|Cc:|To:|cc:).*[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/ { print "email =", $0 }' longfile

This command uses regular expressions to match lines that contain an email address, and then prints the label "email =" followed by the entire matched line. The regular expression used here is not foolproof and may miss some email addresses or match some invalid ones, but it should work for most common cases.