Shell Programming and Scripting

regex
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regex
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regex
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regex

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 sed -n '/regex/,/regex/p'

awk '/regex/{i++;next}{print > "file"i;}' file

#! /bin/bash
c=0
while read x
do
    if [ $x == "regex" ]
    then
        ((c++))
    else
        echo $x >> file_$c
    fi
done < inputfile

# printf "%d",$(echo "scale=3 ; `wc -l <file1` / `wc -l <file2`"|bc)|sed 's/\.//;s/$/&\n/'

((wc -l file 1)/(wc -l file1 + wc -l file2))*100

# printf "%d",$(echo "scale=3 ; 2 / 56"|bc)|sed 's/\.//;s/$/&\n/'
0,035

# awk 'NR==FNR{x=NR}END{print x / FNR}' file1 file2