#get line number of occurrence in text file and then print out x lines from that point

#get the line number of the first occurrence of our search text
linenumber=`grep -n "someuniqueitem" inventory.txt|head -n1|cut -d ":" -f 1`
#linestop represents how many lines after the occurring line we want to print out in this case "20"
linestop=$((linenumber+20))

# sed prints out the line range we want for inventory.txt
# note that the p after $linestop tells sed to print
sed -n "$linenumber,$linestop p" inventory.txt


Combing it into one line:

linenumber=`grep -n "evodal07" inventory.txt|head -n1|cut -d ":" -f 1`&&sed -n "$linenumber,$((linenumber+20)) p" inventory.txt

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