Now we know that we have to add two functions: Usage() and Search_in_File(). If everything went alright the program will return 0.
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The results are captured to do some basic error-handling in the if statement that follows. The actual work is done in the next statement where we call a second function called Search_in_File that uses our command-line input. Iterate through the array and find the frequency of each word and compare the. The system() function can execute a system specific command. Split a line at a time and store in an array. With the system(“cls”) function on windows and system(“clear”) function on Unix/Linux we can clear our screen, so we can display the results on a fresh screen. You must use the -l option to list file names whose contents mention a particular word, for instance, the word primary, using the following command: grep -l primary. To read more on command-line parsing read the following tutorials: C Tutorial – More on Functions and C Tutorial – Command Line Parameter Parsing. (Note: that the first command-line parameter is the program itself.)
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We just say if the command-line parameters are smaller or larger than three, display our usage function and exit the program. iLovePDF is an online service to work with PDF files completely free and easy to use. We also want to make sure that we get a proper usage message, if the command-line options are not inputted correctly. This why we use int main(int argc, char *argv). Result = Search_in_File(argv, argv) īecause we want to write a program that can that can be used over and over, we need to make sure that all the variables we need, such as filename and the search-string, can be inputted at the command-line.