grep.c Write a program that takes a string as a command-line argument and then reads from stdin until the user closes stdin (with ctrl-d). It should print every line that contains the given string. It should be case-sensitive by default, but case-insensitive if the command line option -i is given before the string. ./grep ello # input # output # input, ignored since it doesn't contain "ello" Hello there Hello there Hi there The sun is yellow # input The sun is yellow # output # input, ignored since "ello" is case-sensitive # close stdin YELLOW "D ./grep -i ello Hello there # input # output # input # output Hello there YELLOW YELLOW "D # close stdin

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