diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index e9793d692ad..2d57abdb3cf 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -330,7 +330,7 @@ void cl::ParseCommandLineOptions(int &argc, char **argv,
 
       if (*ArgName == 0 && !DashDashFound) {   // Is this the mythical "--"?
         DashDashFound = true;  // Yup, take note of that fact...
-        continue;              // Don't try to process it as an argument iself.
+        continue;              // Don't try to process it as an argument itself.
       }
 
       const char *ArgNameEnd = ArgName;
diff --git a/lib/Support/FileUtilities.cpp b/lib/Support/FileUtilities.cpp
index 7c8142a4a66..ca4603628ca 100644
--- a/lib/Support/FileUtilities.cpp
+++ b/lib/Support/FileUtilities.cpp
@@ -85,7 +85,7 @@ std::string getUniqueFilename(const std::string &FilenameBase) {
     exit(1);
   }
 
-  // We don't need to hold the temp file descriptor... we will trust that noone
+  // We don't need to hold the temp file descriptor... we will trust that no one
   // will overwrite/delete the file while we are working on it...
   close(TempFD);
   std::string Result(FNBuffer);
diff --git a/lib/Support/Signals.cpp b/lib/Support/Signals.cpp
index effc0599e46..563147eabf8 100644
--- a/lib/Support/Signals.cpp
+++ b/lib/Support/Signals.cpp
@@ -1,7 +1,7 @@
 //===- Signals.cpp - Signal Handling support ------------------------------===//
 //
 // This file defines some helpful functions for dealing with the possibility of
-// unix signals occuring while your program is running.
+// Unix signals occuring while your program is running.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index 0d414facbd5..6c4df04b779 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -103,7 +103,7 @@ static void RedirectFD(const std::string &File, int FD) {
 
 /// RunProgramWithTimeout - This function executes the specified program, with
 /// the specified null-terminated argument array, with the stdin/out/err fd's
-/// redirected, with a timeout specified on the commandline.  This terminates
+/// redirected, with a timeout specified on the command line.  This terminates
 /// the calling program if there is an error executing the specified program.
 /// It returns the return value of the program, or -1 if a timeout is detected.
 ///
diff --git a/support/lib/Support/CommandLine.cpp b/support/lib/Support/CommandLine.cpp
index e9793d692ad..2d57abdb3cf 100644
--- a/support/lib/Support/CommandLine.cpp
+++ b/support/lib/Support/CommandLine.cpp
@@ -330,7 +330,7 @@ void cl::ParseCommandLineOptions(int &argc, char **argv,
 
       if (*ArgName == 0 && !DashDashFound) {   // Is this the mythical "--"?
         DashDashFound = true;  // Yup, take note of that fact...
-        continue;              // Don't try to process it as an argument iself.
+        continue;              // Don't try to process it as an argument itself.
       }
 
       const char *ArgNameEnd = ArgName;
diff --git a/support/lib/Support/FileUtilities.cpp b/support/lib/Support/FileUtilities.cpp
index 7c8142a4a66..ca4603628ca 100644
--- a/support/lib/Support/FileUtilities.cpp
+++ b/support/lib/Support/FileUtilities.cpp
@@ -85,7 +85,7 @@ std::string getUniqueFilename(const std::string &FilenameBase) {
     exit(1);
   }
 
-  // We don't need to hold the temp file descriptor... we will trust that noone
+  // We don't need to hold the temp file descriptor... we will trust that no one
   // will overwrite/delete the file while we are working on it...
   close(TempFD);
   std::string Result(FNBuffer);
diff --git a/support/lib/Support/Signals.cpp b/support/lib/Support/Signals.cpp
index effc0599e46..563147eabf8 100644
--- a/support/lib/Support/Signals.cpp
+++ b/support/lib/Support/Signals.cpp
@@ -1,7 +1,7 @@
 //===- Signals.cpp - Signal Handling support ------------------------------===//
 //
 // This file defines some helpful functions for dealing with the possibility of
-// unix signals occuring while your program is running.
+// Unix signals occuring while your program is running.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/support/lib/Support/SystemUtils.cpp b/support/lib/Support/SystemUtils.cpp
index 0d414facbd5..6c4df04b779 100644
--- a/support/lib/Support/SystemUtils.cpp
+++ b/support/lib/Support/SystemUtils.cpp
@@ -103,7 +103,7 @@ static void RedirectFD(const std::string &File, int FD) {
 
 /// RunProgramWithTimeout - This function executes the specified program, with
 /// the specified null-terminated argument array, with the stdin/out/err fd's
-/// redirected, with a timeout specified on the commandline.  This terminates
+/// redirected, with a timeout specified on the command line.  This terminates
 /// the calling program if there is an error executing the specified program.
 /// It returns the return value of the program, or -1 if a timeout is detected.
 ///