Commands tagged ping (47)

  • Works on any machine with nmap installed. Previous version does not work on machines without "seq". Also works on subnets of any size. Show Sample Output


    21
    nmap -sP 192.168.1.0/24
    sdadh01 · 2010-06-05 14:48:37 2
  • Usefull for when you don't have nmap and need to find a missing host. Pings all addresses from 10.1.1.1 to 10.1.1.254, modify for your subnet. Timeout set to 1 sec for speed, if running over a slow connection you should raise that to avoid missing replies. This will clean up the junk, leaving just the IP address: for i in {1..254}; do ping -c 1 -W 1 10.1.1.$i | grep 'from' | cut -d' ' -f 4 | tr -d ':'; done Show Sample Output


    15
    for i in {1..254}; do ping -c 1 -W 1 10.1.1.$i | grep 'from'; done
    SuperJediWombat · 2010-04-07 16:57:53 0
  • pings a server once per second, and beeps when the server is unreachable. Basically the opposite of: ping -a server-or-ip.com which would beep when a server IS reachable. You could also substitute beep with any command, which makes this a powerful alternative to ping -a: while true; do [ "$(ping -c1W1w1 server-or-ip.com 2>/dev/null | awk '/received/ {print $4}')" = 1 ] && date || echo 'server is down!'; sleep 1; done which would output the date and time every sec until the ping failed, in which case it would echo. Notes: Requires beep package. May need to run as root (beep uses the system speaker) Tested on Ubuntu which doesn't have beep out of the box... sudo apt-get install beep


    14
    while true; do [ "$(ping -c1W1w1 server-or-ip.com | awk '/received/ {print $4}')" != 1 ] && beep; sleep 1; done
    sudopeople · 2009-03-31 20:47:56 4
  • This command uses ping to get the routers' IP addresses to the destination host as traceroute does. If you know what I mean..


    12
    for i in {1..30}; do ping -t $i -c 1 google.com; done | grep "Time to live exceeded"
    fossilet · 2012-02-19 13:37:04 4
  • PING parameters c 1 limits to 1 pinging attempt q makes the command quiet (or silent mode) /dev/null 2>&1 is to remove the display && echo ONLINE is executed if previous command is successful (return value 0) || echo OFFLINE is executed otherwise (return value of 1 if unreachable or 2 if you're offline yourself). I personally use this command as an alias with a predefined machine name but there are at least 2 improvements that may be done. Asking for the machine name or IP Escaping the output so that it displays ONLINE in green and OFFLINE in red (for instance).


    9
    ping -c 1 -q MACHINE_IP_OR_NAME >/dev/null 2>&1 && echo ONLINE || echo OFFLINE
    UnixNeko · 2012-02-09 06:30:55 7
  • Joker wants an email if the Brand X server is down. Set a cron job for every 5 mins with this line and he gets an email when/if a ping takes longer than 3 seconds. Show Sample Output


    8
    ping -q -c1 -w3 brandx.jp.sme 2&>1 /dev/null || echo brandx.jp.sme ping failed | mail -ne -s'Server unavailable' joker@jp.co.uk
    mccalni · 2009-10-13 14:13:04 6
  • When run on a mac, this command will bring up a dialog box in the Terminal when server HOSTNAME first responds to a ping.


    7
    ping -o -i 30 HOSTNAME && osascript -e 'tell app "Terminal" to display dialog "Server is up" buttons "It?s about time" default button 1'
    neologism · 2009-08-03 16:06:57 1
  • It really disables all ICMP responses not only the ping one. If you want to enable it you can use: sudo -s "echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all"


    6
    sudo -s "echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all"
    sliceoflinux · 2010-06-22 19:16:43 0
  • Audio acknowledgement for host availability. When running the command from a Linux systems, you can use "festival" or "espeak" instead of "say".


    6
    Mac OSX: ping -oc 30 8.8.4.4 > /dev/null && say "Google name server is up" || say "This host is down"
    raulyca · 2014-08-01 15:44:57 0
  • Ping sweep without NMAP


    3
    for i in `seq 1 255`; do ping -c 1 10.10.10.$i | tr \\n ' ' | awk '/1 received/ {print $2}'; done
    hemanth · 2009-08-22 09:34:27 3
  • After this, just type: beepwhenup You need to install "beep" before this would make the beep sound. Save it in your .profile if you want to use it later WARNING: this command won't exit until it is successful. You won't be able to CONTROL+C out of it.


    2
    beepwhenup () { echo 'Enter host you want to ping:'; read PHOST; if [[ "$PHOST" == "" ]]; then exit; fi; while true; do ping -c1 -W2 $PHOST 2>&1 >/dev/null; if [[ "$?" == "0" ]]; then for j in $(seq 1 4); do beep; done; ping -c1 $PHOST; break; fi; done; }
    linuxrawkstar · 2009-09-24 18:11:10 4
  • Alternative to the ping check if your firewall blocks ping. Uses curl to get the landing page silently, or fail with an error code. You can probably do this with wget as well. Show Sample Output


    2
    curl -fs brandx.jp.sme 2&>1 > /dev/null || echo brandx.jp.sme ping failed | mail -ne -s'Server unavailable' joker@jp.co.uk
    mccalni · 2009-10-23 14:29:06 0
  • For some reason the 2&>1 does not work for me, but the shorter stdout/stderr redirection >& works perfectly (Ubuntu 10.04).


    2
    ping -q -c1 -w3 server.example.com >& /dev/null || echo server.example.com ping failed | mail -ne -s'Server unavailable' admin@example.com
    brainstorm · 2010-09-08 12:19:29 1

  • 2
    ping HOSTNAME | while read pong; do echo "$(date): $pong"; done
    sammcj · 2011-09-07 02:03:19 0
  • Cleaner with a mailto assignment in crontab (if the command fails you get an email): MAILTO=admin@example.com 10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 >/dev/null


    2
    10,30,50 * * * * ping -c1 -w3 192.168.0.14 >/dev/null
    bashrc · 2012-02-06 14:54:15 0
  • Nasty perl one-liner that provides a sparkline of ping times. If you want a different history than the last 30, just put that value in. It (ab)uses unicode to draw the bars, inspired by https://github.com/joemiller/spark-ping . It's not the most bug-free piece of code, but what it lacks in robustness it makes up for in capability. :) If anyone has any ideas on how to make it more compact or better, I'd love to hear them. I included a ping to google in the command just as an example (and burned up 10 chars doing it!). You should use it with: $ ping example.com | $SPARKLINE_PING_COMMAND Show Sample Output


    2
    ping g.co|perl -ne'$|=/e=(\S+)/||next;(push@_,$1)>30&&shift@_;print"\r",(map{"\xe2\x96".chr(128+7*$_/(sort{$b<=>$a}@_)[0])." "}@_),"$1ms"'
    bartgrantham · 2012-07-06 22:42:06 0

  • 2
    nmap -sn 192.168.1.0/24
    pdxdoughnut · 2014-01-28 23:32:18 0
  • Will report back IP address's of all hosts that are UP. Show Sample Output


    2
    fping -ga 192.168.1.0/24 2> /dev/null
    netaxiz · 2014-01-31 19:19:19 0
  • Waits for all pings to complete and returns ip with mac address


    2
    (prefix="10.59.21" && for i in `seq 254`; do (sleep 0.5 && ping -c1 -w1 $prefix.$i &> /dev/null && arp -n | awk ' /'$prefix'.'$i' / { print $1 " " $3 } ') & done; wait)
    smoky · 2014-04-02 11:20:57 0
  • This allows for sleeping in between pings. Also, espeak needs to be installed.


    2
    speakwhenup() { [ "$1" ] && PHOST="$1" || return 1; until ping -c1 -W2 $PHOST >/dev/null 2>&1; do sleep 5s; done; espeak "$PHOST is up" >/dev/null 2>&1; }
    aguslr · 2014-11-26 10:22:18 0
  • This command only check the network connection from given eth. This is very useful if you are using more then one interface in your server or laptop. Show Sample Output


    1
    ping -I eth0 www.yahoo.com
    octopus · 2010-04-12 06:25:07 0
  • This is like ping -a, but it does the opposite. It alerts you if the network is down, not up. Note that the beep will be from the speaker on the server, not from your terminal. Once a second, this script checks if the Internet is accessible and beeps if it is not. I define the Net as being "UP", if I can ping Google's public DNS server (8.8.8.8), but of course you could pick a different static IP address. I redirect the beep to /dev/console so that I can run this in the background from /etc/rc.local. Of course, doing that requires that the script is run by a UID or GID that has write permissions to /dev/console (usually only root). Question: I am not sure if the -W1 flag works under BSD. I have only tested this under GNU/Linux using ping from iputils. If anybody knows how portable -W is, please post a comment.


    1
    while :; do ping -W1 -c1 -n 8.8.8.8 > /dev/null || tput bel > /dev/console; sleep 1; done
    hackerb9 · 2010-09-24 06:34:12 1
  • I have used single packet, and in a silent mode with no display of ping stats. This is with color and UI improvement to the http://www.commandlinefu.com/commands/view/10220/check-if-a-machine-is-online. It is as per the enhancements suggested. Show Sample Output


    1
    echo -n "IP Address or Machine Name: "; read IP; ping -c 1 -q $IP >/dev/null 2>&1 && echo -e "\e[00;32mOnline\e[00m" || echo -e "\e[00;31mOffline\e[00m"
    crlf · 2012-02-09 07:00:03 1

  • 0
    for ip in `seq 1 255`; do ping -c 1 192.168.1.$ip ; done | grep ttl
    takeshin · 2010-06-05 13:15:06 1
  • If you're very busy and don't want to wait for a ping response, use it. This command will be waiting for a successful ping response, to play a sound file to warn you that the target host is available.


    0
    continuar=true; while $continuar; do if ping -c 3 [target_IP_address] 2>&1> /dev/null ; then mplayer [sound_file]; continuar=false; break; fi; done
    mack · 2011-04-25 21:44:05 4
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Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Find the package that installed a command

Console clock
Turn your terminal into digital clock.

notify yourself when a long-running command which has ALREADY STARTED is finished
If you want to be notified when a long-running command is finished, but you have already started it: CTRL+Z $ fg; echo "finished" | sendmail me@example.com I use a script to post a tweet, which sends me a txt: $ fg; echo "finished" | tweet

Convert IP octets to HEX with no dots.
Converts IP octets to hex using printf command. Useful for generating pxeboot aliases in the pxelinux.cfg folder.

TCPDUMP & Save Capture to Remote Server w/ GZIP
NOTE: When opening the files you might need to strip the very top line with notepad++ as its a mistake header This is useful when the local machine where you need to do the packet capture with tcpdump doesn?t have enough room to save the file, where as your remote host does tcpdump -i eth0 -w - | ssh forge.remotehost.com -c arcfour,blowfish-cbc -C -p 50005 "cat - | gzip > /tmp/eth0.pcap.gz" Your @ PC1 doing a tcpdump of PC1s eth0 interface and its going to save the output @ PC2 who is called save.location.com to a file /tmp/eth0-to-me.pcap.gz again on PC2 More info @: http://www.kossboss.com/linuxtcpdump1

Extract dd-image from VirtualBox VDI container and mount it
Tested with NTFS and found on this site: http://forensicir.blogspot.com/2008/01/virtualbox-and-forensics-tools.html The first 32256 bytes is the MBR

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