Add text utils sheet

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+# Various small text manipulation utilities
+
+## `cut`
+
+Select fields from each line based on some delimeter
+
+    cut -d <delimiter> -f <list of fields>
+
+Setting a different output delimiter:
+
+    --output-delimiter <delimiter>
+
+## `comm`
+
+    comm file1 file2
+
+Outputs three columns:
+
+1. Lines unique to `file1`
+2. Lines unique to `file2`
+3. Lines in both files
+
+Assumes files are sorted.
+
+Suppress a column with e.g. `-1`.
+
+### Intersection of two files
+
+    comm -12 file1 file2