grep: initial notes

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+# grep(1)
+
+```
+sort [opts] [pattern] [files]
+    -e <pattern>        pattern to search for (can be supplied multiple times)
+    -i                  ignore case in patterns
+    -v                  invert match
+
+    -n                  add line numbers to matched lines
+    -H                  add file name to matched lines
+
+    -r                  recursively read all files
+    -I                  skip binary files
+    --include <glob>    search only files matching glob
+    --exclude <glob>    skip searching files matching glob
+
+    -c                  count occurrence of matched patterns
+    -l                  list only file name which contain the pattern
+```
+> `<glob>` patterns may need to be quoted or escaped if the shell also does glob expansion.