If you want to search a file for a line that includes a specific word then simply issue the command
grep science science-paper
That would search the file science-paper for the word science and show the line where the word is located
If you want to ignore case sensitivity, in that if you issue the command
grep ScIeNce science-paper
then the word science would still be returned, then simply include the argument
-i
So the command would be
grep -i ScIeNce science-paper
Other grep arguments include
-v display lines that don’t match
-n precede each matching line with the line number
-c print only the number of matched lines
To issue the grep command with multiple arguments just bunch all the arguments together like this
grep -in science science-paper
that would display each line precede with the line number as we include the -n argument as well
