nixCraft

oronno · #1 (**permalink**) 08-12-2007, 05:43 PM

Hi, i couldnt figure out how to write this script. can any one help me ? please responce asap

problem 1: Write a shell script (/bin/sh) to write the names of the first (alphabetically) five files of the current directory to a new file called ‘zzz’.

problem 2: Write a shell script (/bin/sh) called 'loggedOn' which is passed two usernames as command line parameters. Using the ‘who’ command, the script should see whether both users are logged on and, if so, should indicate which of them is logged onto the system the most times. If only one or neither is logged on, an error message should be written.

rockdalinux · #2 (**permalink**) 08-13-2007, 02:27 AM

Quote:

problem 1: Write a shell script (/bin/sh) to write the names of the first (alphabetically) five files of the current directory to a new file called ‘zzz’.

By default ls command sort out names under Linux:

Code:

#!/bin/sh
ls | head -5

Quote:

problem 2: Write a shell script (/bin/sh) called 'loggedOn' which is passed two usernames as command line parameters. Using the ‘who’ command, the script should see whether both users are logged on and, if so, should indicate which of them is logged onto the system the most times. If only one or neither is logged on, an error message should be written.

Script:

Code:

#!/bin/bash
USR1=$1
USR2=$2
u1times=0
u2times=0
if [ $# -ne 2 ]; then
 echo "Syntax: $0 user1 user2"
 exit 1
fi
who | egrep -w $USR1 > /dev/null
if [ $? -eq 0 ]; then
        u1times=$(last | egrep -w $USR1)
else
        echo "Error $USR1 not logged in"
        exit 1
fi

who | egrep -w $USR2 > /dev/null
if [ $? -eq 0 ]; then
        u2times=$(last | egrep -w $USR2)
else
        echo "Error $USR2 not logged in"
        exit 1
fi
if [ $u1times -gt $u2times ]; then
        echo "$USR1 logged most of the time"
else
        echo "$USR2 logged most of the time"
fi

Hope you are able to explain it to your tutor

oronno · #3 (**permalink**) 08-13-2007, 07:38 AM

thanks for your help buddy. but the first problem u solved is not clear for me. because there is something i need to make, such as creat a new file and u didnt complete the whole thing

. can you please give me full script for problem 1 ? thanks

nixcraft · #4 (**permalink**) 08-16-2007, 12:40 AM

Code:

#!/bin/sh
ls | head -5 > zzz

there I fixed for you

A.L.E.X · #5 (**permalink**) 08-16-2007, 06:08 PM

don't you guys think that

Code:

ls | egrep -v '^[0-9]' | head -5 > zzz

will be better solution ? I really don't know ... "alphabetically" confuse me

monk · #6 (**permalink**) 08-22-2007, 01:10 PM

Quote:

Originally Posted by A.L.E.X

don't you guys think that

Code:

ls | egrep -v '^[0-9]' | head -5 > zzz

will be better solution ? I really don't know ... "alphabetically" confuse me

Yes alphabetically means ignore out digits .. I guess your solution is correct

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Alphabetical file name and list logged in user script

Alphabetical file name and list logged in user script

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