Typo fix

Notebooks/Unix/awk/awk.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# File processing with AWK\n",
     "\n",
-    "AWK is a programming language named after the initials of its three inventors: Alfred **A**ho, Peter **W**einberger, and Brian **K**ernighan. AWK is incredibly powerful at processing files, particularly column-bases files, which are commonplace in Bioinformatics. For example, BED, GFF, and SAM files.\n",
+    "AWK is a programming language named after the initials of its three inventors: Alfred **A**ho, Peter **W**einberger, and Brian **K**ernighan. AWK is incredibly powerful at processing files, particularly column-based files, which are commonplace in Bioinformatics. For example, BED, GFF, and SAM files.\n",
     "\n",
     "Although long programs, put into a separate file, can be written using AWK, we will use it directly on the command line. Effectively, these are very short AWK programs, often called \"one-liners\".\n",
     "\n",