Grep In Linux

In this video we will learn how to use the grep command. First example I search for my name in the file names.txt:

grep donald names.txt

To search for whole words, we will use the -w option for example:

grep -w "donald smouse" names.txt

You would put the string in qutoes if it contains spaces or other characters as well.

To do a case sensitive search we would use the -i with grep, for example:

grep -i donald names.txt

To only search for the string only in text files we would:

grep -i donald *.txt(you don't have to use an option when searching only txt files, just *.txt for example grep donald *.txt)

to do a recursive search regardless of extension we would:

grep -r Donald .

Combining flags to do a search for example:

grep -ir Donald . (this would do a case sensitive as well as a recursive search in the /home/cyberguy folder)

You don't have to search within your home directory alone, you can search for anything anywhere!!!

If you wanted to add line numbers to the output we would:

grep -n Donald names.txt

If you wanted to highlight the keyword output we would:

sudo grep --color cyberguy /var/log, and the output would be highlighted(my example on my machine cyberguy is in red color)

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