Question

I need this done ASAP. Please write a bash shell script that does the following:

• Prints out how many users are logged on.

  1. This can be accomplished using who and wc.

• Prints out a list of currently logged on users.

  1. This can be accomplished using who, grep, regular expressions, and echo.

• Prints out how many processes you have running from past days, and a list of those jobs.

  1. Use `whoami` to get your username.

  2. Run ps -ef and see how the jobs running from the past can be identified.

  3. Then use ps, grep, cut, wc to get the count, and again to get the list.

• Output should be formatted as follows:

  1. There are currently <#> users logged on.

  2. Users logged on: <username>.

  3. You have <#> processes still running from the past.

     1. <username> <PID> <date> <time> <process>

Please also write another script that determines the existence and readability of all the filenames given as command line arguments:

• Output should be in three sections. Example:

  • files: file1 file2 file3 file4 file5

  • The following does not exist:

    • file1

  • The following exists but you cannot read them:

    • file2 file5

  • The following exist and you can read them:

    • file3 file4

Answer 1

a=`w | wc -l`
echo "There are currently $a users logged on"
echo

echo "Users logged on: `whoami`"
echo

n=`ps -efu | wc -l`
echo "You have $n processes still running from the past"
echo

ps -efu

FILES="$@"
for i in $FILES
do
   if [ ! -f $i ]
   then
       echo "The following does not exist: $i"  
   elif [ -w $i ]
   then
       echo "The following exists but you cannot read them: $i"
   else [ -r $i ]
       echo "The following exist and you can read them: $i"
   fi
done

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