diff --git a/text_file_replace.py b/text_file_replace.py
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+++ b/text_file_replace.py
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+"""
+Author:         Linjian Li (github.com/LinjianLi)
+Created:        2020-04-09
+Last Modified:  2020-04-09
+
+Description:    A script that replace specified text string in a text file.
+
+How to use:     `-f` specifying the text file,
+                `-e` specifying the encoding (optional),
+                `-o` specifying the old text string to be replaced),
+                `-n` specifying the new text string to replace with.
+"""
+
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("-f", "--file", help = "File.")
+parser.add_argument("-e", "--encoding", default='utf-8', help = "Encoding.")
+parser.add_argument("-o", "--old", help = "Old string.")
+parser.add_argument("-n", "--new", help = "New string.")
+args = parser.parse_args()
+
+f = args.file
+e = args.encoding
+o = args.old
+n = args.new
+
+lines = []
+with open(file=f, mode='r', encoding=e) as fd:
+    for line in fd:
+        lines.append(line.replace(o, n))
+
+with open(file=f, mode='w', encoding=e) as fd:
+    fd.writelines(lines)
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