1. Read MANIFEST.MF file of a .jar file
$ unzip -q myarchive.jar META-INF/MANIFEST.MF
2. Show public IP for my laptop
1) dig
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dig o-o.myaddr.l.google.com txt @ns1.google.com +short
nslookup -type=txt o-o.myaddr.l.google.com ns1.google.com
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"10.11.12.13"
OpenDNS:
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dig myip.opendns.com @resolver1.opendns.com +short
nslookup myip.opendns.com resolver1.opendns.com
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10.11.12.13
Akamai:
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dig whoami.akamai.net. @ns1-1.akamaitech.net. +short
nslookup whoami.akamai.net. ns1-1.akamaitech.net.
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10.11.12.13
other usage
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dig o-o.myaddr.l.google.com txt
nslookup -type=txt o-o.myaddr.l.google.com
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returns txt record of DNS request to authoritative source address
edns0-client-subnet if available, showing original DNS request source address
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dig o-o.myaddr.l.google.com txt @8.8.8.8 +short
nslookup -type=txt o-o.myaddr.l.google.com 8.8.8.8
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"198.51.100.1"
"edns0-client-subnet 203.0.113.0/24"
2) curl
curl ifconfig.co
