#!/usr/bin/env sh

# @(#) s3       Demonstrate deleting a range with line editor.

#  ____
# /
# |   Infrastructure BEGIN

echo
set -o nounset

debug=":"
debug="echo"

## The shebang using "env" line is designed for portability. For
#  higher security, use:
#
#  #!/bin/sh -

## Use local command version for the commands in this demonstration.

EDITOR=ex
EDITOR=ed

set +o nounset
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version =o $(_eat $0 $1) $EDITOR
set -o nounset

echo

FILE=data1
cp sacred $FILE
echo " Input file $FILE:"
cat $FILE

before=5
after=6
pattern="pattern"

# |   Infrastructure END
# \
#  ---

echo
echo " Output from editor $EDITOR:"
$EDITOR <<EOF $FILE
/$pattern/-${before},/$pattern/+${after}d
w
q
EOF
echo
echo " Output file $FILE:"
cat $FILE

exit 0

% ./s3

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
GNU ed version 0.2

 Input file data1:
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
pattern
1
2
3
4
5
6
7
8
9
10

 Output from editor ed:
60
25

 Output file data1:
-10
-9
-8
-7
-6
7
8
9
10