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--- grep:basic_usage [2020/08/22 10:53] – 192.168.1.1
+++ grep:basic_usage [2020/08/22 11:02] (current) – 192.168.1.1
@@ Line 100: / Line 100: @@
 **NOTE:**  grep prints out 4 as there are 4 occurrences of the word **boo**.
 </WRAP>
+----
+===== Determine which files contain the Search String =====
+<code bash>
+grep -l "boo" *
+</code>
+<WRAP info>
+**NOTE:**  The **-l** option prints only the filenames of files in the query that have lines that match the search string.
+This is useful if you are searching through multiple files for the same string.
+</WRAP>
+----
+===== Ignore Case =====
+<code bash>
+grep -i "BOO" filename
+</code>
+<WRAP info>
+**NOTE:**  The **-i** option will treat upper and lower case as equivalent while matching the search string.
+</WRAP>
+----
+===== Exact Matches Only =====
+<code bash>
+grep -x "boo" filename
+</code>
+<WRAP info>
+**NOTE:**  The **-x** option looks for eXact matches only.
+The result in this example will print nothing, because there are no lines that only contain the pattern **boo**.
+</WRAP>
+----
+===== Add additional lines of context =====
+<code bash>
+grep -A2 "mach" filename
+</code>
+returns:
+<code bash>
+machine
+boots
+bungie
+</code>
+<WRAP info>
+**NOTE:**  The **A** option will print out the search string plus a number of additional lines.
+In this example 2 additional lines.
+</WRAP>