question archive Case Scenario A staff member has requested a list of the names of the services recognized by the current Linux image
Case Scenario A staff member has requested a list of the names of the services recognized by the current Linux image
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Case Scenario
A staff member has requested a list of the names of the services recognized by the current Linux image. A file named /etc/services has been located that contains the pertinent information; however it is not organized to easily determine all of the services.
Using a combination of pipes, redirects and control statements, produce output that contains only the service names. The entire task must be accomplished without using any intermediary files. Each service should only be listed once and captured to a file named uniqueservices.txt, located in the home directory. Remove any blank lines or lines that are deemed to be comments.
There could be more than one possible solution for obtaining the desired results.
Objectives
? Extract all the service names from the file. ?
Sort the names alphabetically removing any duplicates. ?
Remove any blank lines or lines that do not begin with a letter of the alphabet.
Capture the final output to a file named uniqueservices.txt. ?
Count the lines in the file using a conditional command that is only executed if the previous combined commands are successful.
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Answer:
If you notice there are three types of lines in this file:
- Lines starting with #, basically comments.
- Blank lines
- Service name entry starts with a word, followed by spaces and port numbers etc.
According to the requirement, we need to get rid of 1, 2 and everything in 3 except the service name. Here is the single line command to meet the objective.
PFA
