Pos 420 week 4 individual assignment file processing commands
Pos 420 week 4 individual assignment file processing commands
File Processing Commands Worksheet – 15 Marks – Week 4 1. How do you know how many number of users currently logged into the system? (Not considering if any user is logged more than one time) (1)
A. who | uniq | sort | wc -l
B. who | cut -d' ' –f1 | uniq | wc -l
C. who | sort | uniq | wc -l
D. who | cut -d' ' –f1 | sort -u | wc -l
E. who | cut -d' ' –f1 | uniq -d | wc -
2. Create a file “employees.txt” using vi editor or pico.
(The file will have 6 fields, ID, Name, Designation, Dept, D.O.B, Salary separated by pipe)
Enter these lines in the file and save it.
2133|charles smith |Manager|sales|12/12/56| 90000
9576|Rob Thomson|director |production|03/12/50|130000
5778|David Blake |General Manager|marketing |04/19/43| 85000
2765|Rick Martin|director|personnel |05/11/47|120000
(Use cut command for the following questions A,B)
A. Display the person's name, his designation and salary in the above file.
(Show the command and output)
3. How do you display the hour and minute from date command using cut utility (1)
(Show the command and output)
4. What is the difference between the following commands? (1)
$ who | grep 'mary'
and
$ who | grep '^mary'
5. We know that all user information is stored in /etc/passwd where fields are delimited by a colon. Display only their userids using cut command. (userid is the first field in /etc/passwd file) Show only top 10 userids. (1)
6. Create the following four files chapter1, chapter2, chapter3, chapter4 in your current directory and enter the following text:
Chapter1 :
This is the first line in this file
This chapter deals with the basic information of a UNIX system.
Chapter2 :
This is the first line in this file
This chapter deals with Unix System info and shell introduction.
Chapter3 :
This is the first line in this File System
This chapter deals with various Unix Systems.
Chapter4 :
This is the first line in this file
This chapter deals with kernel system.
The question is to search for a string "System" or "system" in the above files. Use wild cards in both pattern and file searching. (1)
7. Show these commands and output:
A. Redirect man pages of ‘grep’ to a file called, man_grep in /tmp directory.
B. Display lines not having the word “system” in the above file.(1)
8. Which command of the following is correct ? (Some may work but does not make sense). (1)
a. cat file file > file3 | wc -l
b. cut -d ":" filename
c. ls -l | grep unix myfile
d. head filename | tail
e. find name "myfile.txt" -print
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