Specify the field to search for a string in the Linux shell script

awk-F\|'$3>=170&&$3<=180{print$0}'data.txt

I see.

-F\| delimiter specification, where | is recognized as a pipe, so escape with \.

For each line,
$3>=170&$3<=180| When the third field separated by $3> 170170&$3< br180 is between 170 and 180...
{print$0}View $0 (whole line)

The behavior is

It's called a "shell script", so if you dare to use IFS to specify the delimiter instead of awk.

is_height_in_range(){
  localmin = $1
  local max = $2
  local line = "$3"

  IFS="|"
  set--${line}
  ["$3"-ge "$min"] & ["$3"-le "$max"]
  return
}

IFS =
while read line;do
  is_height_in_range170 180"$line"||continue
  printf'%s\n'"$line"
done

local I'm using it, so it's not POSIX compatible, but I think most shells work.

If read returns a non-zero status, it will exit the while loop, so if there is no new line at the end of the file, the last line will be ignored, but simplicity was prioritized because it is not the essence of the answer.