Ubuntu Server Utilities

Linux DIG Command Examples for DNS Lookup

dig redhat.com - dns lookup

dig redhat.com  MX - mx records lookup

dig redhat.com NS

View ALL DNS Records Types Using dig -t ANY

dig -t ANY redhat.com

DNS Reverse Look-up Using dig -x

dig -x 209.132.183.81

Use a Specific DNS server Using dig @dnsserver

dig @ns1.redhat.com redhat.com

Extract Images from PDF Files With PDFimages

apt-get install poppler-utils

pdfimages --help for options

eg

pdfimages -j filename.pdf prefixforallfiles

if the image doesn't convert to jpg. then use the mogrify to convert them. mogrify is part of imagemagick

mogrify -format jpg *.pcm // this will convert all *.pcm files to jpg