Shell Programming and Scripting

function chr() {
  printf "\\$(printf '%03o' "$1")";
  return 0;
}

function ord()
{
  printf '%d' "'$1";
  return 0;
}

ord "$(chr 10)"

[~] 0 $ type ord ; type chr
ord ist eine Funktion.
ord () 
{ 
    printf '%d' "'$1";
    return 0
}
chr ist eine Funktion.
chr () 
{ 
    printf "\\$(printf '%03o' "$1")";
    return 0
}
[~] 0 $  ord $(chr 97)
97[~] 0 $

x="
"; echo ${#x}
1
x=$(echo "
"); echo ${#x}
0

IFS= read -r -n 1 -d '' x < <(chr 10)
echo ${#x}
1
ord "$x"
10

awk -lordchr 'BEGIN {print ord(chr(10))}'

Last login: Wed Apr 29 21:46:11 on ttys000
AMIGA:amiga~> dash
AMIGA:\u\w> ord()
> {
>     printf "%u\n" "'${1}"        
> }
AMIGA:\u\w> ord "
> "
10
AMIGA:\u\w> exit
AMIGA:amiga~> _

#!/bin/sh

# #!/usr/local/bin/dash
# newline.sh

printf "\nA test.\n\n" > /tmp/nl

for subscript in 0 1 2 3 4 5 6 7 8 9
do
    nl=$( hexdump -n1 -s${subscript} -v -e '1/1 "%04o"' < /tmp/nl )
    printf "%u\n" "${nl}"
done

Last login: Thu Apr 30 16:16:02 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./newline.sh
10
101
32
164
145
163
164
46
10
10
AMIGA:amiga~/Desktop/Code/Shell> _