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I hope my question won't offend you, but I have a problem working with characters. I'm using an Oracle VM environment, where I've installed a Linux image. I have to create a script which will take 2 arguments: a word and a key. I have to encrypt the given word using the key. The problem is that I have to change the word letter by letter and I don't really know how to do that. My script's code:

#!/bin/bash INPUT=$1 KEY=$2 while [ $[#KEY] -lt $[#INPUT] ] do KEY=$KEY$KEY done nr=$[#INPUT] for i in {0..nr} do echo "$(INPUT[i])" done

I don't have any experience in Linux commands and, especially, in characters manipulation (I used to use them quite often in C, but it seems that Linux has different rules for characters).

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  • This has nothing to do with Linux. If you're writing your program in bash, then you need to learn how bash works. Commented Dec 30, 2017 at 15:41
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    bash isn't the right language to use if you need to manipulate a string like this. Commented Dec 30, 2017 at 15:48
  • Some hints: 1) To get length of a variable, use: ${#var}. 2) To get the nth character of a string, you can use: ${var:n:1} where n can be a variable. 3) To loop over the characters, you can use C-style for loop: for ((i=0; i<${#var}; i++)); do echo ${var:i:1}; done. But as @chepner mentioned, bash is not the right tool. Commented Dec 30, 2017 at 16:14
  • what do you suggest me to use,besides bash? Commented Dec 30, 2017 at 17:52
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