'How to retrieve a character in a string at a index in bash [duplicate]

I am new to shell scripting I was wondering how do you index a string in bash For example in C++ we would do string[0] to get the first character in the string, how to do a similar thing in shell scripting?

mystring=helloworld

I want to traverse the string character by character For example in C++ I would do

for (auto i = 0;i < mystring.length(); i++)
      cout << mystring[i]
stringbashshellsh


Solution 1:[1]

Use parameter expansion. ${#mystring} returns the string length, ${mystring:offset:length} returns a substring.

#! /bin/bash
mystring=helloworld
for ((i=0; i<${#mystring}; ++i)) ; do
    printf %s "${mystring:i:1}"
done

Solution 2:[2]

echo "Hello" | awk '{split($0,a,""); print a[1]}'

print a[1] This is for Index Character a[2] ... a[n] you can do

{split($0,a,"") This is for character to split "" meaning split every character

Sources

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Source: Stack Overflow

Solution Source
Solution 1 choroba
Solution 2 nude

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