In C..

1)Write a program yell that is similar to echo except that it converts text to all-caps. yell takes a single argument, replaces all lower-case letters with upper-case letters, and prints the resulting string.

Usage

$ ./yell hello HELLO

$ ./yell "Its over 9000" ITS OVER 9000

2)Write a program rle that uses a simple method to compress strings. rle takes a single argument and looks for repeated characters. Each repeated sequence of a letter or punctuation mark is reduced to a single character plus an integer indicating the number of times it occurs. Thus, aaa becomes a3 and ab becomes a1b1. If the compressed string is longer than the original string, rle must print the original string instead. If the input string contains digits, rle must print error and nothing else.

Usage

$ ./rle aaaaaa

a6

$ ./rle aaabcccc..a

a3b1c4.2a1

$ ./rle aaabab

aaabab

$ ./rle a1b2

error

3)Write a program anagram that sorts the letters in a word, which is useful when searching for anagrams. anagram takes a single argument, which is a string containing only lower-case letters, sorts the letters alphabetically, and then prints the sorted letters. You may use any sorting algorithm you are familiar with, but you must write the sort function yourself. You may not use any sort function provided by a library.

Usage $ ./anagram hello ehllo

$ ./anagram positivity iiiopsttvy

$ ./anagram abcdef abcdef