Question

Use a while loop to read each line in the file modified_etc_passwd directly and process each line as follows:

 Use a combination of the echo and cut commands to assign the contents of the home directory field of the current record to a variable called homedir

 Use a combination of the echo and cut commands to assign the contents of the username field to a variable called username

 If homedir exists as a directory o Use a combination of the echo and cut commands to assign the contents that appears before the + of the GECOS field to a variable called fullname o If /home/STUDENTS/majors/username exists  Echo fullname and append to the file majors.txt Example: echo $fullname >> majors.txt o Otherwise  If /home/STUDENTS/nonmajors/username exists  Echo fullname and append to the file nonmajors.txt  Otherwise  Echo username and append to the file not_student.txt  Otherwise o Echo the current record and append to the file no_homedir.txt

When finished, execute your script with official data file provided and create 4 clean output files.

How do I write this in VNC Viewer?

Answer 1

Working code implemented in Shell.

main.sh Source Code:

#This script checks to see if certain directories exist and where they are located.
#   Then it generates some lists in files that contain which group each individual
#   user belongs to.

#! bin/bash

#read each line of input file
while read line;do
   #create variable names for the home directory and username
   homedir=`echo $line|cut -d: -f6`
   username=`echo $line|cut -d: -f1`
   #if the home directory exists
   if [ -d $homedir ];then
       #create a variable for the full name
       fullname=`echo $line|cut -d: -f5|cut -d+ -f1`
       #if the user's directory is a subdirectory of 'majors'
       if [ -d /home/STUDENTS/majors/$username ];then
           #put full name in 'majors.txt' list file
           echo $fullname >> majors.txt
       else
           #if the user's directory is a subdirectory of 'nonmajors'
           if [ -d /home/STUDENTS/nonmajors/$username ];then
               #put full name in 'nonmajors.txt' list file
               echo $fullname >> nonmajors.txt
           else
               #else put username into 'not_student.txt' list file
               echo $username >> not_student.txt
           fi
       fi
   else
       #else: put the line read into 'no_homedir.txt' list file
       echo $line >> no_homedir.txt
   fi
#input file
done < modified_etc_passwd

Code Screenshots: