--- a/ChengsongTanPhdThesis/example.bib	Sun Dec 18 16:53:53 2022 +0000
+++ b/ChengsongTanPhdThesis/example.bib	Sun Dec 18 18:17:52 2022 +0000
@@ -1016,3 +1016,9 @@
 	pages = {246--256},
 	title = {{T}he {I}mpact of {R}egular {E}xpression {D}enial of {S}ervice ({ReDoS}) in {P}ractice: {A}n {E}mpirical {S}tudy at the {E}cosystem {S}cale},
 	year = {2018}}
+
+
+@misc{grep,
+	title = {GNU grep},
+	url = {https://www.gnu.org/software/grep/manual/grep.html},
+}