find and replace words in a file using shell scripting. add an index in the beginning of each line in a file using shell scripting. what is multithreading? difference between single threaded and multithreaded. difference between hashmap and hashtable. when should you use hashmap and hashtable? difference between stack and queue.

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Shell scripting for find and replace, adding index to lines, multithreading, hashmap vs hashtable, stack vs queue

Use sed command for find and replace in shell scripting
Use awk command to add an index at the beginning of each line in a file
Multithreading is the ability of a CPU to execute multiple threads concurrently
Single threaded means only one thread is executed at a time, while multithreaded allows multiple threads to run simultaneously
HashMap allows null values and keys, Hashtable does not allow null values or keys
Use HashMap when null values or keys are needed, use Hashtable when thread safety is required
Stack follows Last In First Out (LIFO) principle, Queue follows First In First Out (FIFO) principle

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