Shell Programming and Scripting

a = 1
<point>
 123123
 2342352
 234231
 234256
</point>
print a

a = 1
print a

sed '/point/,/\/point/d' file

# sed -n '1p;$p' infile
a = 1
print a

sed -n '/point/,/\/point/!p' file

# sed -n '/[a-z][^<point>]/p' infile
a = 1
print a

# sed '/<point>/,${;/print/!d}' infile
a = 1
print a

#!/bin/bash

declare -i flag
flag=0
while read -r LINE
do
  case "$LINE" in
   *"</point>"*)
      LINE=${LINE##*</point>}
      flag=0
      ;;
   *"<point>"*)
      LINE=${LINE%%<point>*}
      echo "$LINE"
      flag=1
      ;;
  esac
  [[ $flag = 1 ]] && continue
  [[ $flag = 0 ]] && echo "$LINE"
done < "file"

# cat file
a = 1
some text here , don't delete <point>
 123123
 2342352
 234231
 234256
</point> some text here  too that cannot be deleted
print a

linux$ ./myscript.sh
a = 1
some text here , don't delete
 some text here  too that cannot be deleted
print a

a = 1
b = 1
<point>
124134
123123
42352
</point>
print a
c = 1

a = 1
print a
c = 1