Shell Programming and Scripting

 awk -F "[<>]" ' $2 ~ /<Clinical features:>|<Clinical features:>|<Inheritance pattern:>|<Inheritance pattern:>/{print $2, $3}' OFS='\t' genedx156.txt > output.txt

Clinical features:
The recessive form of hypohidrotic ectodermal dysplasia that is due to mutation in the EDAR gene (coding for the human homolog of the mouse downless gene) is clinically indistinguishable from the X-linked form. It affects males and females equally. Clinical features include hypotrichosis with fine, sparse and light-colored scalp and body hair, decreased ability to sweat leading to heat intolerance, hypodontia and conical or peg shaped teeth. Hypoplastic breasts are not uncommon. Typical facial features are periorbital hyperpigmentation, saddle nose and full lips. Affected individuals in families in which the disease behaves in a dominant manner are similarly affected. The X-linked form of hypohidrotic ectodermal dysplasia due to a mutation in the EDA1 gene is much more common than mutation(s) in the EDAR/downless gene.
Inheritance pattern:
Mutations in the EDAR gene are responsible for both autosomal dominant and autosomal recessive forms of hypohidrotic ectodermal dysplasia.

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awk -F "[<>]" '/^Clinical features:$|^Inheritance pattern:$/{print;getline;print}' OFS='\t' genedx156.txt

 awk -F "[<>]" '/^Clinical features:$|^Inheritance pattern:$/{print;getline;print}' OFS='\t' genedx156.txt > output.txt

awk '/^[^:]*:$|^[ \t]*$/{f=0} /^Clinical features:$|^Inheritance pattern:$/{f=1}f' genedx156.txt > output.txt