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you can as well type in at console


cat samplefile.txt|grep pattern | awk -F/ '{print $4}' | awk -F. '{print $1}'

out put would be ready.

Note: this works only if your files look like...

Also statement should be like

let no3=`expr "$no1" + "$no2"`

you can use pendrive linux, no need to install just run as a MS windows application, works same as cygwin however this has got all power tools and is easy to work with.