Looking for convenient way of converting space separated ASCII numbers to letters in Shell-CodePudding

I want to convert 104 101 108 108 111 to hello string in Shell without using any external tool. What would be the convenient way to do this?

CodePudding user response：

There a function that'll help:

chr() {
    printf "\x$(printf "%x" "$1")"
}

chr 65    # => A

CodePudding user response：

This should work on any POSIX shell:

#!/bin/sh                                                                                                                                                                                                                                        
numbers="104 101 108 108 111"
# Rely on word splitting here to break up the string                                                                                                                                                                                             
printf "$(printf '\%o' $numbers)\n"

The inner printf converts each decimal number to a base-8 octal one with a leading backslash, which the outer printf then displays as the corresponding character. Plus a newline for neatness.