Grep all lines from the first to the last occurrence of a pattern in a file

greplines.sh

# !/bin/bash
#
# greplines.sh
# Grep all lines from first to last occurrence of <pattern> in <file>
#

if [ "$#" -lt 2 ]; then
	echo "usage: $0 <pattern> <file> [-v]"
	exit
fi

pattern=$1
fileName=$2
verbose=$3

initialLine=$(grep -n "$pattern" $fileName | head -n1 | cut -d':' -f1)
endLine=$(grep -n "$pattern" $fileName | tail -n1 | cut -d':' -f1)

sed "$initialLine,$endLine!d" $fileName

if [ "$verbose" = "-v" ]; then
	echo ""
	echo "[+] Pattern: $pattern"
	echo "[+] Filename: $fileName"
	echo "[+] Initial line: $initialLine"
	echo "[+] End line: $endLine"
	echo ""
fi