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If the above is stored in the executable file ./check, the shell command ./check " 1 ) evil" will attempt to execute the injected shell command evil instead of comparing the argument with the constant one. Here, the code under attack is the code that is trying to check the parameter, the very code that might have been trying to validate the ...
Built-in functions are termed commands or, if they return a value, identifiers. Custom scripted functions are called aliases. Aliases that return a value are known as custom identifiers. Both are called from the command line or other parts of a script in the same ways as built-in commands and identifiers (and can even supersede them).