language: s/behaviour/behavior/g

We currently use both spellings the british "behaviour" and the american
"behavior". However "behavior" is more used in the project so I think
it's worth dropping the british name.

Closes #6395

28 files changed, 51 insertions, 50 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index 61ecd4fe1..c65e1ab62 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -143,7 +143,7 @@ int main (void)
 dnl CURL_CHECK_AIX_ALL_SOURCE
 dnl -------------------------------------------------
 dnl Provides a replacement of traditional AC_AIX with
-dnl an uniform behaviour across all autoconf versions,
+dnl an uniform behavior across all autoconf versions,
 dnl and with our own placement rules.
 
 AC_DEFUN([CURL_CHECK_AIX_ALL_SOURCE], [
diff --git a/docs/INTERNALS.md b/docs/INTERNALS.md
index f5da02f43..11ca33e50 100644
--- a/docs/INTERNALS.md
+++ b/docs/INTERNALS.md
@@ -145,7 +145,7 @@ Windows vs Unix
 
    That's taken care of by the `curl_global_init()` call, but if other libs
    also do it etc there might be reasons for applications to alter that
-   behaviour.
+   behavior.
 
    We require WinSock version 2.2 and load this version during global init.
 
diff --git a/docs/cmdline-opts/post301.d b/docs/cmdline-opts/post301.d
index 9cc2ad018..64ead0536 100644
--- a/docs/cmdline-opts/post301.d
+++ b/docs/cmdline-opts/post301.d
@@ -6,7 +6,7 @@ Added: 7.17.1
 Category: http post
 ---
 Tells curl to respect RFC 7231/6.4.2 and not convert POST requests into GET
-requests when following a 301 redirection. The non-RFC behaviour is ubiquitous
+requests when following a 301 redirection. The non-RFC behavior is ubiquitous
 in web browsers, so curl does the conversion by default to maintain
 consistency. However, a server may require a POST to remain a POST after such
 a redirection. This option is meaningful only when using --location.
diff --git a/docs/cmdline-opts/post302.d b/docs/cmdline-opts/post302.d
index 02749032f..d73cb9dcd 100644
--- a/docs/cmdline-opts/post302.d
+++ b/docs/cmdline-opts/post302.d
@@ -6,7 +6,7 @@ Added: 7.19.1
 Category: http post
 ---
 Tells curl to respect RFC 7231/6.4.3 and not convert POST requests into GET
-requests when following a 302 redirection. The non-RFC behaviour is ubiquitous
+requests when following a 302 redirection. The non-RFC behavior is ubiquitous
 in web browsers, so curl does the conversion by default to maintain
 consistency. However, a server may require a POST to remain a POST after such
 a redirection. This option is meaningful only when using --location.
diff --git a/docs/libcurl/curl_easy_init.3 b/docs/libcurl/curl_easy_init.3
index 7e29e47d3..6661cad2d 100644
--- a/docs/libcurl/curl_easy_init.3
+++ b/docs/libcurl/curl_easy_init.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -37,7 +37,7 @@ does it automatically.  This may be lethal in multi-threaded cases, since
 \fIcurl_global_init(3)\fP is not thread-safe, and it may result in resource
 problems because there is no corresponding cleanup.
 
-You are strongly advised to not allow this automatic behaviour, by calling
+You are strongly advised to not allow this automatic behavior, by calling
 \fIcurl_global_init(3)\fP yourself properly.  See the description in
 \fBlibcurl\fP(3) of global environment requirements for details of how to use
 this function.
diff --git a/docs/libcurl/curl_getenv.3 b/docs/libcurl/curl_getenv.3
index 5a306ef11..707d6493c 100644
--- a/docs/libcurl/curl_getenv.3
+++ b/docs/libcurl/curl_getenv.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -29,7 +29,7 @@ curl_getenv - return value for environment name
 .ad
 .SH DESCRIPTION
 curl_getenv() is a portable wrapper for the getenv() function, meant to
-emulate its behaviour and provide an identical interface for all operating
+emulate its behavior and provide an identical interface for all operating
 systems libcurl builds on (including win32).
 
 You must \fIcurl_free(3)\fP the returned string when you're done with it.
diff --git a/docs/libcurl/curl_multi_setopt.3 b/docs/libcurl/curl_multi_setopt.3
index cf4cc1e8f..64e506d77 100644
--- a/docs/libcurl/curl_multi_setopt.3
+++ b/docs/libcurl/curl_multi_setopt.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -29,7 +29,7 @@ CURLMcode curl_multi_setopt(CURLM * multi_handle, CURLMoption option, param);
 .SH DESCRIPTION
 \fIcurl_multi_setopt(3)\fP is used to tell a libcurl multi handle how to
 behave. By using the appropriate options to \fIcurl_multi_setopt(3)\fP, you
-can change libcurl's behaviour when using that multi handle.  All options are
+can change libcurl's behavior when using that multi handle.  All options are
 set with the \fIoption\fP followed by the parameter \fIparam\fP. That
 parameter can be a \fBlong\fP, a \fBfunction pointer\fP, an \fBobject
 pointer\fP or a \fBcurl_off_t\fP type, depending on what the specific option
diff --git a/docs/libcurl/opts/CURLOPT_DIRLISTONLY.3 b/docs/libcurl/opts/CURLOPT_DIRLISTONLY.3
index e1560ba5f..a2015c8b9 100644
--- a/docs/libcurl/opts/CURLOPT_DIRLISTONLY.3
+++ b/docs/libcurl/opts/CURLOPT_DIRLISTONLY.3
@@ -33,7 +33,7 @@ names of files in a directory, rather than performing a full directory listing
 that would normally include file sizes, dates etc.
 
 For POP3 a parameter of 1 tells the library to list the email message or
-messages on the POP3 server. This can be used to change the default behaviour
+messages on the POP3 server. This can be used to change the default behavior
 of libcurl, when combined with a URL that contains a message ID, to perform a
 "scan listing" which can then be used to determine the size of an email.
 
diff --git a/docs/libcurl/opts/CURLOPT_MAXCONNECTS.3 b/docs/libcurl/opts/CURLOPT_MAXCONNECTS.3
index 3cfa88735..1e5c63863 100644
--- a/docs/libcurl/opts/CURLOPT_MAXCONNECTS.3
+++ b/docs/libcurl/opts/CURLOPT_MAXCONNECTS.3
@@ -32,7 +32,7 @@ Pass a long. The set \fIamount\fP will be the maximum number of simultaneously
 open persistent connections that libcurl may cache in the pool associated with
 this handle. The default is 5, and there isn't much point in changing this
 value unless you are perfectly aware of how this works and changes libcurl's
-behaviour. This concerns connections using any of the protocols that support
+behavior. This concerns connections using any of the protocols that support
 persistent connections.
 
 When reaching the maximum limit, curl closes the oldest one in the cache to
diff --git a/docs/libcurl/opts/CURLOPT_POSTFIELDS.3 b/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
index 060a19b10..abbb81b3f 100644
--- a/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
+++ b/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
@@ -35,7 +35,7 @@ way. For example, the web server may assume that this data is url-encoded.
 
 The data pointed to is NOT copied by the library: as a consequence, it must be
 preserved by the calling application until the associated transfer finishes.
-This behaviour can be changed (so libcurl does copy the data) by setting the
+This behavior can be changed (so libcurl does copy the data) by setting the
 \fICURLOPT_COPYPOSTFIELDS(3)\fP option.
 
 This POST is a normal application/x-www-form-urlencoded kind (and libcurl will
diff --git a/docs/libcurl/opts/CURLOPT_POSTREDIR.3 b/docs/libcurl/opts/CURLOPT_POSTREDIR.3
index c83ff531a..1fcc80063 100644
--- a/docs/libcurl/opts/CURLOPT_POSTREDIR.3
+++ b/docs/libcurl/opts/CURLOPT_POSTREDIR.3
@@ -40,7 +40,7 @@ libcurl maintain the request method after a 302 redirect whilst setting bit 2
 after a 303 redirect. The value \fBCURL_REDIR_POST_ALL\fP is a convenience
 define that sets all three bits.
 
-The non-RFC behaviour is ubiquitous in web browsers, so the library does the
+The non-RFC behavior is ubiquitous in web browsers, so the library does the
 conversion by default to maintain consistency. However, a server may require a
 POST to remain a POST after such a redirection. This option is meaningful only
 when setting \fICURLOPT_FOLLOWLOCATION(3)\fP.
diff --git a/include/curl/curl.h b/include/curl/curl.h
index d43864b87..6b5f97a5e 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1615,7 +1615,7 @@ typedef enum {
   CURLOPT(CURLOPT_NEW_FILE_PERMS, CURLOPTTYPE_LONG, 159),
   CURLOPT(CURLOPT_NEW_DIRECTORY_PERMS, CURLOPTTYPE_LONG, 160),
 
-  /* Set the behaviour of POST when redirecting. Values must be set to one
+  /* Set the behavior of POST when redirecting. Values must be set to one
      of CURL_REDIR* defines below. This used to be called CURLOPT_POST301 */
   CURLOPT(CURLOPT_POSTREDIR, CURLOPTTYPE_VALUES, 161),
 
diff --git a/lib/doh.c b/lib/doh.c
index 41d34dd30..1660fb402 100644
--- a/lib/doh.c
+++ b/lib/doh.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2018 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2018 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -468,7 +468,7 @@ static unsigned int get32bit(const unsigned char *doh, int index)
       the pointer first. */
    doh += index;
 
-   /* avoid undefined behaviour by casting to unsigned before shifting
+   /* avoid undefined behavior by casting to unsigned before shifting
       24 bits, possibly into the sign bit. codegen is same, but
       ub sanitizer won't be upset */
   return ( (unsigned)doh[0] << 24) | (doh[1] << 16) |(doh[2] << 8) | doh[3];
diff --git a/lib/hostip.c b/lib/hostip.c
index 50fb42f21..eaa0bdbc3 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -728,7 +728,7 @@ enum resolve_t Curl_resolv_timeout(struct connectdata *conn,
     keep_copysig = TRUE; /* yes, we have a copy */
     sigact.sa_handler = alarmfunc;
 #ifdef SA_RESTART
-    /* HPUX doesn't have SA_RESTART but defaults to that behaviour! */
+    /* HPUX doesn't have SA_RESTART but defaults to that behavior! */
     sigact.sa_flags &= ~SA_RESTART;
 #endif
     /* now set the new struct */
diff --git a/lib/setopt.c b/lib/setopt.c
index cd7ec3fa8..731ffeb36 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -602,7 +602,7 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
 
   case CURLOPT_POSTREDIR:
     /*
-     * Set the behaviour of POST when redirecting
+     * Set the behavior of POST when redirecting
      * CURL_REDIR_GET_ALL - POST is changed to GET after 301 and 302
      * CURL_REDIR_POST_301 - POST is kept as POST after 301
      * CURL_REDIR_POST_302 - POST is kept as POST after 302
diff --git a/lib/telnet.c b/lib/telnet.c
index 8bf64a9f2..4ae42716b 100644
--- a/lib/telnet.c
+++ b/lib/telnet.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -214,7 +214,7 @@ CURLcode init_telnet(struct connectdata *conn)
   tn->him_preferred[CURL_TELOPT_SGA] = CURL_YES;
 
   /* To be compliant with previous releases of libcurl
-     we enable this option by default. This behaviour
+     we enable this option by default. This behavior
          can be changed thanks to the "BINARY" option in
          CURLOPT_TELNETOPTIONS
   */
diff --git a/lib/transfer.c b/lib/transfer.c
index a2a890ecf..41bdc353d 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1650,7 +1650,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
      * request with an error page. To be sure that libcurl gets the page that
      * most user agents would get, libcurl has to force GET.
      *
-     * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
+     * This behavior is forbidden by RFC1945 and the obsolete RFC2616, and
      * can be overridden with CURLOPT_POSTREDIR.
      */
     if((data->state.httpreq == HTTPREQ_POST
@@ -1675,7 +1675,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
      * request with an error page. To be sure that libcurl gets the page that
      * most user agents would get, libcurl has to force GET.
      *
-     * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
+     * This behavior is forbidden by RFC1945 and the obsolete RFC2616, and
      * can be overridden with CURLOPT_POSTREDIR.
      */
     if((data->state.httpreq == HTTPREQ_POST
diff --git a/lib/url.c b/lib/url.c
index d86d8b0b6..fd9237de4 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -2171,7 +2171,7 @@ static bool check_noproxy(const char *name, const char *no_proxy)
         /* Look for the end of the token. */
         ;
 
-      /* To match previous behaviour, where it was necessary to specify
+      /* To match previous behavior, where it was necessary to specify
        * ".local.com" to prevent matching "notlocal.com", we will leave
        * the '.' off.
        */
diff --git a/lib/vssh/libssh.c b/lib/vssh/libssh.c
index e79d8e823..74cbfe6e9 100644
--- a/lib/vssh/libssh.c
+++ b/lib/vssh/libssh.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2017 - 2020 Red Hat, Inc.
+ * Copyright (C) 2017 - 2021 Red Hat, Inc.
  *
  * Authors: Nikos Mavrogiannopoulos, Tomas Mraz, Stanislav Zidek,
  *          Robert Kolcun, Andreas Schneider
@@ -1228,7 +1228,7 @@ static CURLcode myssh_statemach_act(struct connectdata *conn, bool *block)
         /* If we have restart position then open for append */
         flags = O_WRONLY|O_APPEND;
       else
-        /* Clear file before writing (normal behaviour) */
+        /* Clear file before writing (normal behavior) */
         flags = O_WRONLY|O_CREAT|O_TRUNC;
 
       if(sshc->sftp_file)
diff --git a/lib/vssh/libssh2.c b/lib/vssh/libssh2.c
index b44c9d232..ac2af07af 100644
--- a/lib/vssh/libssh2.c
+++ b/lib/vssh/libssh2.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1894,7 +1894,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
         /* If we have restart position then open for append */
         flags = LIBSSH2_FXF_WRITE|LIBSSH2_FXF_APPEND;
       else
-        /* Clear file before writing (normal behaviour) */
+        /* Clear file before writing (normal behavior) */
         flags = LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT|LIBSSH2_FXF_TRUNC;
 
       sshc->sftp_handle =
diff --git a/lib/vssh/wolfssh.c b/lib/vssh/wolfssh.c
index 5dd95546c..1a43f635f 100644
--- a/lib/vssh/wolfssh.c
+++ b/lib/vssh/wolfssh.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2019 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2019 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -583,7 +583,7 @@ static CURLcode wssh_statemach_act(struct connectdata *conn, bool *block)
         /* If we have restart position then open for append */
         flags = WOLFSSH_FXF_WRITE|WOLFSSH_FXF_APPEND;
       else
-        /* Clear file before writing (normal behaviour) */
+        /* Clear file before writing (normal behavior) */
         flags = WOLFSSH_FXF_WRITE|WOLFSSH_FXF_CREAT|WOLFSSH_FXF_TRUNC;
 
       memset(&createattrs, 0, sizeof(createattrs));
diff --git a/scripts/copyright.pl b/scripts/copyright.pl
index d1f8ef7ec..3a5b12af9 100755
--- a/scripts/copyright.pl
+++ b/scripts/copyright.pl
@@ -6,7 +6,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -118,7 +118,7 @@ sub checkfile {
     my $found = scanfile($file);
 
     if(!$found) {
-        print "$file: missing copyright range\n";
+        print "$file:1: missing copyright range\n";
         return 2;
     }
 
@@ -140,8 +140,9 @@ sub checkfile {
 
     if(defined($commityear) && scalar(@copyright) &&
        $copyright[0]{year} != $commityear) {
-        print "$file: copyright year out of date, should be $commityear, " .
-            "is $copyright[0]{year}\n";
+        printf "$file:%d: copyright year out of date, should be $commityear, " .
+            "is $copyright[0]{year}\n",
+            $copyright[0]{line};
     }
     else {
         $fine = 1;
diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index 91c278663..feb4109fd 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1990,7 +1990,7 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
       /* This makes the FTP sessions use PORT instead of PASV */
       /* use <eth0> or <192.168.10.10> style addresses. Anything except
          this will make us try to get the "default" address.
-         NOTE: this is a changed behaviour since the released 4.1!
+         NOTE: this is a changed behavior since the released 4.1!
       */
       GetStr(&config->ftpport, nextarg);
       break;
diff --git a/src/tool_operate.c b/src/tool_operate.c
index 15e82b4bd..92aa99843 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1276,7 +1276,7 @@ static CURLcode single_transfer(struct GlobalConfig *global,
          * lib/telnet.c will Curl_poll() on the input file descriptor
          * rather then calling the READFUNCTION at regular intervals.
          * The circumstances in which it is preferable to enable this
-         * behaviour, by omitting to set the READFUNCTION & READDATA options,
+         * behavior, by omitting to set the READFUNCTION & READDATA options,
          * have not been determined.
          */
         my_setopt(curl, CURLOPT_READDATA, input);
diff --git a/tests/FILEFORMAT.md b/tests/FILEFORMAT.md
index ab6b3f565..41325ed66 100644
--- a/tests/FILEFORMAT.md
+++ b/tests/FILEFORMAT.md
@@ -200,7 +200,7 @@ part number and will then increase the part number with one. This is useful
 for auth tests and similar.
 
 `sendzero=yes` means that the (FTP) server will "send" the data even if the
-size is zero bytes. Used to verify curl's behaviour on zero bytes transfers.
+size is zero bytes. Used to verify curl's behavior on zero bytes transfers.
 
 `base64=yes` means that the data provided in the test-file is a chunk of data
 encoded with base64. It is the only way a test case can contain binary
diff --git a/tests/README.md b/tests/README.md
index 4b524a045..6bc995642 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -109,7 +109,7 @@
   output text messages or escape sequences on user login.  When these shell
   startup messages or escape sequences are output they might corrupt the
   expected stream of data which flows to the sftp-server or from the ssh
-  client which can result in bad test behaviour or even prevent the test
+  client which can result in bad test behavior or even prevent the test
   server from running.
 
   If the test suite ssh or sftp server fails to start up and logs the message
diff --git a/tests/libtest/first.c b/tests/libtest/first.c
index 84369fca8..ffb211fd4 100644
--- a/tests/libtest/first.c
+++ b/tests/libtest/first.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -146,7 +146,7 @@ int main(int argc, char **argv)
 
   /*
    * Setup proper locale from environment. This is needed to enable locale-
-   * specific behaviour by the C library in order to test for undesired side
+   * specific behavior by the C library in order to test for undesired side
    * effects that could cause in libcurl.
    */
 #ifdef HAVE_SETLOCALE
diff --git a/tests/runtests.pl b/tests/runtests.pl
index daa0c33a5..6c5edc84d 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -6,7 +6,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -407,7 +407,7 @@ foreach $protocol (('ftp', 'http', 'ftps', 'https', 'no', 'all')) {
 }
 
 # make sure we don't get affected by other variables that control our
-# behaviour
+# behavior
 
 delete $ENV{'SSL_CERT_DIR'} if($ENV{'SSL_CERT_DIR'});
 delete $ENV{'SSL_CERT_PATH'} if($ENV{'SSL_CERT_PATH'});