Bash script to get ASCII values for alphabet
Define these two functions (usually available in other languages):
chr() {
[ "$1" -lt 256 ] || return 1
printf "\\$(printf '%03o' "$1")"
}
ord() {
LC_CTYPE=C printf '%d' "'$1"
}
Usage:
chr 65
A
ord A
65
You can see the entire set with:
$ man ascii
You'll get tables in octal, hex, and decimal.
This works well,
echo "A" | tr -d "\n" | od -An -t uC
echo "A" ### Emit a character.
| tr -d "\n" ### Remove the "newline" character.
| od -An -t uC ### Use od (octal dump) to print:
### -An means Address none
### -t select a type
### u type is unsigned decimal.
### C of size (one) char.
exactly equivalent to:
echo -n "A" | od -An -tuC ### Not all shells honor the '-n'.