for i in `seq 0 255`; do
ping -c 1 192.168.1.$i
done

This will just ping each address between 192.168.1.0 and 225 once and give normal output. From there, you can parse the output and decide if it's up or down.

nmap -sn 192.168.1.0/24

you can also use nmap to do this, just use /24 to scan all the addresses (192.168.0.0/24)

Edit: Arie is faster than me.

Damn, that is nice. I'll have to remember that.

I'm assuming if you're new to Linux command line stuff, that includes scripting, so

Open Pico
Add #!/bin/bash or /usr/local/bin/bash or wherever bash is to the first line
then add

Save as [script name].sh
chmod +x [script name].sh to add execute permissions (if need be)

Run with ./[script name].sh

vim master race

fuck that, nano owns for simple shit like that

Agreed. I can use vim, but I'm still more used to nano.
Vim for long configs or logs, nano for simple scripts/text files.

Am I the only one using desktop editor (Sublime Text) as my main?

I use "ne" which gives the best of both worlds.

have sublime on the desktop
vim/ee/nano + tmux over ssh

#!/bin/bash

ip=$(ifconfig | grep "Bcast:" | cut -d: -f3 | cut -d' ' -f1 | cut -d'.' -f1-3)

for i in `seq 0 255`;

do
ping -c 1 $ip.$i
if []
then
echo "Host "$ip.$i" is up."
else
echo "Host "$ip.$i" is down."
fi
done

The pinging works but I can't seem to figure out how to get a return value for my if statement

If I wish to do it this way, what would I need to enter between the [] to check if the ping was succesful or not? Anything I should add?

this seems to work:
#!/bin/bash
ip=$(ifconfig | grep Bcast | cut -d: -f 3 | cut -d. -f 1,2,3)"."
for i in $(seq 1 254)
do
code=$(ping -c 1 "$ip$i" | grep received | cut -d, -f 2 | cut -d' ' -f $
if [ $code != 0 ]
then
echo "Host "$ip$i" is up."
else
echo "Host "$ip$i" is down."
fi
done

Probably an easier way to do this though :(

This was cool too, but not allowed to use nmap as it requires apt get. ty though

Ty for this

What do you mean it requires apt-get? Are you using a different distro that uses a different package manager? Every distro that I know of has nmap in its repos. Even if it doesn't you can always build from the source code.

Are you on a network without root access? IF yes, then why the hell are you trying to scan addresses of other people's computers without their permission?

Cause he wants to troll his classmates using nasty scripts found on the internet, hellooo? :D

To the OP: If that's what you want to do it's not a good idea.
Given that you needed help for that you won't cover tracks and your administrator will know who did it plus your colleagues certainly won't find it fun.
Please treat it more like an advice and don't take any offence. Play some 8Ball if you're bored during lessons since this won't take you anywhere.

I'm using ubuntu (not updated) since that's the distribution we're using, might be possible it was already then but when I tried arie's command it said nmap was not installed

I'm new to all of this so please explain why I can't do it like this, the task was to make a script that reads your ip from ifconfig and then using this pings every ip from 1-254 to see if they're up/down.

Keep in mind I'm just following orders here, I have no intention to use something like this myself. I don't even know what I could do with it, other than ping address with 1 packet

Oh sorry I thought you wanted to SSH your classmates to open cd drives etc. :P
Anyways "for" way is the right one and if it was assignment someone gave you then he probably didn't want you to use nmap anyways