diff --git a/dropshell-tool/src/BashrcEditor.cpp b/dropshell-tool/src/BashrcEditor.cpp
index 1b617da..e6fd836 100644
--- a/dropshell-tool/src/BashrcEditor.cpp
+++ b/dropshell-tool/src/BashrcEditor.cpp
@@ -1,18 +1,95 @@
 #include "BashrcEditor.hpp"
 #include <fstream>
+#include <sstream>
+#include <vector>
 #include <string>
+#include <algorithm>
+
+std::string removeWhitespace(const std::string& s) {
+    std::string out;
+    for (char c : s) {
+        if (!isspace(static_cast<unsigned char>(c))) out += c;
+    }
+    return out;
+}
+
+static constexpr const char* BLOCK_START = "#---DROPSHELL-TOOL-START---";
+static constexpr const char* BLOCK_END   = "#---DROPSHELL-TOOL-END---";
 
 BashrcEditor::BashrcEditor(const std::string& bashrcPath) : bashrcPath(bashrcPath) {}
 
 bool BashrcEditor::hasSourceLine(const std::string& scriptPath) const {
-    // TODO: Implement file reading to check for source line
+    std::ifstream infile(bashrcPath);
+    if (!infile) return false;
+    std::string line;
+    bool inBlock = false;
+    const std::string blockStart = removeWhitespace(BLOCK_START);
+    const std::string blockEnd = removeWhitespace(BLOCK_END);
+    const std::string target = "source \"" + scriptPath + "\"";
+    while (std::getline(infile, line)) {
+        std::string trimmed = removeWhitespace(line);
+        if (trimmed == blockStart) {
+            return true;
+        }
+    }
     return false;
 }
 
 void BashrcEditor::addSourceLine(const std::string& scriptPath) {
-    // TODO: Implement file append logic
+    std::ifstream infile(bashrcPath);
+    std::vector<std::string> lines;
+    std::string line;
+    bool inBlock = false;
+    const std::string blockStart = removeWhitespace(BLOCK_START);
+    const std::string blockEnd = removeWhitespace(BLOCK_END);
+    while (std::getline(infile, line)) {
+        std::string trimmed = removeWhitespace(line);
+        if (trimmed == blockStart) {
+            inBlock = true;
+            continue;
+        }
+        if (trimmed == blockEnd) {
+            inBlock = false;
+            continue;
+        }
+        if (!inBlock) {
+            lines.push_back(line);
+        }
+    }
+    infile.close();
+    lines.push_back(BLOCK_START);
+    lines.push_back("source \"" + scriptPath + "\"");
+    lines.push_back(BLOCK_END);
+    std::ofstream outfile(bashrcPath, std::ios::trunc);
+    for (const auto& l : lines) {
+        outfile << l << "\n";
+    }
 }
 
-void BashrcEditor::removeSourceLine(const std::string& scriptPath) {
-    // TODO: Implement file removal logic
+void BashrcEditor::removeSourceLine(const std::string& /*scriptPath*/) {
+    std::ifstream infile(bashrcPath);
+    std::vector<std::string> lines;
+    std::string line;
+    bool inBlock = false;
+    const std::string blockStart = removeWhitespace(BLOCK_START);
+    const std::string blockEnd = removeWhitespace(BLOCK_END);
+    while (std::getline(infile, line)) {
+        std::string trimmed = removeWhitespace(line);
+        if (trimmed == blockStart) {
+            inBlock = true;
+            continue;
+        }
+        if (trimmed == blockEnd) {
+            inBlock = false;
+            continue;
+        }
+        if (!inBlock) {
+            lines.push_back(line);
+        }
+    }
+    infile.close();
+    std::ofstream outfile(bashrcPath, std::ios::trunc);
+    for (const auto& l : lines) {
+        outfile << l << "\n";
+    }
 } 
\ No newline at end of file
diff --git a/dropshell-tool/src/BashrcEditor.hpp b/dropshell-tool/src/BashrcEditor.hpp
index 259acfb..ce27280 100644
--- a/dropshell-tool/src/BashrcEditor.hpp
+++ b/dropshell-tool/src/BashrcEditor.hpp
@@ -4,8 +4,11 @@
 class BashrcEditor {
 public:
     BashrcEditor(const std::string& bashrcPath);
+    // Checks if the unique block with the source line exists
     bool hasSourceLine(const std::string& scriptPath) const;
+    // Adds or updates the unique block with the given scriptPath
     void addSourceLine(const std::string& scriptPath);
+    // Removes the unique block
     void removeSourceLine(const std::string& scriptPath);
 private:
     std::string bashrcPath;