Commands using host (41)
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The host command comes with the bind-utils package, which is has a better chance to be installed than resolveip from mysql. The last word of the query result is displayed, which is the last result host got. This works with CNAMEs. You get "3(NXDOMAIN)" in case of failure. Show Sample Output
0hostresult=$(host -t A www.example.com); echo "${hostresult##* }" -
0sudo tcpdump -n -i eth0 -w data.pcap -v tcp or udp and 'not host 192.168.1.2'
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0lsof -p `pidof pidgin` | awk '{ print $9 }'|egrep `hostname` | grep -o ">[^:]\+:" | tr -d ":>" | while read line; do host $line; done;
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0ngrep host 192.168.1.6 -O $(date +%Y%m%d_%H%M%S).pcap > $(date +%Y%m%d_%H%M%S).txt
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Execute commands serially on a list of hosts. Each ssh connection is made in the background so that if, after five seconds, it hasn't closed, it will be killed and the script will go on to the next system. Maybe there's an easier way to set a timeout in the ssh options...
0for host in $MYHOSTS; do ping -q -c3 $H 2>&1 1>/dev/null && ssh -o 'AllowedAuthe ntications publickey' $host 'command1; command2' & for count in 1 2 3 4 5; do sleep 1; jobs | wc -l | grep -q ^0\$ && continue; done; kill %1; done -
Cleaned up and silent with &>/dev/null at the end. Show Sample Output
0for host in $HOSTNAMES; do ping -q -c3 $host && ssh $host 'command' & for count in {1..15}; do sleep 1; jobs | wc -l | grep -q ^0\$ && continue; done; kill %1; done &>/dev/null -
0for i in `ip addr show dev eth1 | grep inet | awk '{print $2}' | cut -d/ -f1`; do echo -n $i; echo -en '\t'; host $i | awk '{print $5}'; done
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0host example.com | head -1 | awk '{print $4}'
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0host -t a www.google.com
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Gives the DNS listed IP for the host you're on... or replace `hostname` with any other host Show Sample Output
0host `hostname` | rev | cut -d' ' f1 | rev -
needed; apt-get install tcpkill
0tcpkill host <ip> -
alternative using 'host' Show Sample Output
-1host -t a dartsclink.com | sed 's/.*has address //' -
Get just the IP address for a given hostname. For best results, make this a function in your shell rc file so that it can be used for things like traceroute: Titus:~$ traceroute `getip foo.com` traceroute to 64.94.125.138 (64.94.125.138), 64 hops max, 52 byte packets Show Sample Output
-1host foo.com|grep " has address "|cut -d" " -f4 -
-1host google.com|awk '{print $NF}'
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This is a better way to do the "src X or dst X" filter; plus you might not want to bother with DNS lookups (-n).
-1tcpdump -s 1024 -l -A -n host 192.168.9.56 -
This is a useful command that gives the hostname and the IP Address of your machine, on many OS. Tested on Linux and Solaris. host command here is followed by `hostname`. Note the ` in the command is a back quote (or grave accent or back tic that usually shares the space with the ~ key). No other options are specified. See sample output. Show Sample Output
-2host `hostname` - < 1 2
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