diff --git a/README.md b/README.md
index f73a0c0..d732d72 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,13 @@ Documentation: https://core.sasjs.io
 - No X command
 - Prefixes: _mf_, _mp_
 
+**fcmp** library (SAS9/Viya)
+- Function and macro names are identical, except for special cases
+- Prefixes: _mcf_
+
+The fcmp macros are used to generate fcmp functions, and can be used with or
+without the `proc fcmp` wrapper.
+
 **meta** library (SAS9 only)
 
 - OS independent
diff --git a/all.sas b/all.sas
index ffa7cad..de7d752 100644
--- a/all.sas
+++ b/all.sas
@@ -18804,3 +18804,82 @@ run;
 %inc "%sysfunc(pathname(work))/ml_json.lua";
 
 %mend ml_json;
+/**
+  @file
+  @brief Adds a string to a file
+  @details Creates an fcmp function for appending a string to an external file.
+  If the file does not exist, it is created.
+
+  The function itself takes the following paramters:
+
+  | PARAMETER | DESCRIPTION |
+  |------------|-------------|
+  | filepath $  | full path to the file|
+  | string  $  | string to add to the file |
+  | mode $     | mode of the output - either APPEND (default) or CREATE |
+
+  It returns 0 if successful, or -1 if an error occured.
+
+  Usage:
+
+      %mcf_string2file(wrap=YES, insert_cmplib=YES)
+
+      data _null_;
+        rc=mcf_string2file(
+          "%sysfunc(pathname(work))/newfile.txt"
+          , "This is a test"
+          , "CREATE");
+      run;
+
+      data _null_;
+        infile "%sysfunc(pathname(work))/newfile.txt";
+        input;
+        putlog _infile_;
+      run;
+
+  @param [out] wrap= (NO) Choose YES to add the proc fcmp wrapper.
+  @param [out] insert_cmplib= (NO) Choose YES to insert the package into the
+    CMPLIB reference.
+  @param [out] lib= (work) The output library in which to create the catalog.
+  @param [out] cat= (sasjs) The output catalog in which to create the package.
+  @param [out] pkg= (utils) The output package in which to create the function.
+    Uses a 3 part format:  libref.catalog.package
+
+**/
+
+%macro mcf_string2file(wrap=NO
+  ,insert_cmplib=NO
+  ,lib=WORK
+  ,cat=SASJS
+  ,pkg=UTILS
+)/*/STORE SOURCE*/;
+
+%if &wrap=YES  %then %do;
+  proc fcmp outcat=&lib..&cat..&pkg;
+%end;
+
+function mcf_string2file(filepath $, string $, mode $);
+  if mode='APPEND' then fmode='a';
+  else fmode='o';
+  length fref $8;
+  rc=filename(fref,filepath);
+  if (rc ne 0) then return( -1 );
+  fid = fopen(fref,fmode);
+  if (fid = 0) then return( -1 );
+  rc=fput(fid, string);
+  rc=fwrite(fid);
+  rc=fclose(fid);
+  rc=filename(fref);
+  return(0);
+endsub;
+
+
+%if &wrap=YES %then %do;
+  quit;
+%end;
+
+%if &insert_cmplib=YES %then %do;
+  options insert=(CMPLIB=(&lib..&cat));
+%end;
+
+%mend mcf_string2file;
\ No newline at end of file
diff --git a/build.py b/build.py
index 61e88be..1ad3046 100755
--- a/build.py
+++ b/build.py
@@ -84,7 +84,7 @@ options noquotelenmax;
 """
 f = open('all.sas', "w")             # r / r+ / rb / rb+ / w / wb
 f.write(header)
-folders=['base','meta','metax','viya','lua']
+folders=['base','meta','metax','viya','lua','fcmp']
 for folder in folders:
     filenames = [fn for fn in Path('./' + folder).iterdir() if fn.match("*.sas")]
     filenames.sort()
diff --git a/fcmp/mcf_string2file.sas b/fcmp/mcf_string2file.sas
new file mode 100644
index 0000000..add97ab
--- /dev/null
+++ b/fcmp/mcf_string2file.sas
@@ -0,0 +1,79 @@
+/**
+  @file
+  @brief Adds a string to a file
+  @details Creates an fcmp function for appending a string to an external file.
+  If the file does not exist, it is created.
+
+  The function itself takes the following (positional) parameters:
+
+  | PARAMETER | DESCRIPTION |
+  |------------|-------------|
+  | filepath $  | full path to the file|
+  | string  $  | string to add to the file |
+  | mode $     | mode of the output - either APPEND (default) or CREATE |
+
+  It returns 0 if successful, or -1 if an error occured.
+
+  Usage:
+
+      %mcf_string2file(wrap=YES, insert_cmplib=YES)
+
+      data _null_;
+        rc=mcf_string2file(
+          "%sysfunc(pathname(work))/newfile.txt"
+          , "This is a test"
+          , "CREATE");
+      run;
+
+      data _null_;
+        infile "%sysfunc(pathname(work))/newfile.txt";
+        input;
+        putlog _infile_;
+      run;
+
+  @param [out] wrap= (NO) Choose YES to add the proc fcmp wrapper.
+  @param [out] insert_cmplib= (NO) Choose YES to insert the package into the
+    CMPLIB reference.
+  @param [out] lib= (work) The output library in which to create the catalog.
+  @param [out] cat= (sasjs) The output catalog in which to create the package.
+  @param [out] pkg= (utils) The output package in which to create the function.
+    Uses a 3 part format:  libref.catalog.package
+
+**/
+
+%macro mcf_string2file(wrap=NO
+  ,insert_cmplib=NO
+  ,lib=WORK
+  ,cat=SASJS
+  ,pkg=UTILS
+)/*/STORE SOURCE*/;
+
+%if &wrap=YES  %then %do;
+  proc fcmp outcat=&lib..&cat..&pkg;
+%end;
+
+function mcf_string2file(filepath $, string $, mode $);
+  if mode='APPEND' then fmode='a';
+  else fmode='o';
+  length fref $8;
+  rc=filename(fref,filepath);
+  if (rc ne 0) then return( -1 );
+  fid = fopen(fref,fmode);
+  if (fid = 0) then return( -1 );
+  rc=fput(fid, string);
+  rc=fwrite(fid);
+  rc=fclose(fid);
+  rc=filename(fref);
+  return(0);
+endsub;
+
+
+%if &wrap=YES %then %do;
+  quit;
+%end;
+
+%if &insert_cmplib=YES %then %do;
+  options insert=(CMPLIB=(&lib..&cat));
+%end;
+
+%mend mcf_string2file;
\ No newline at end of file
diff --git a/main.dox b/main.dox
index ad3e9de..33a1b14 100644
--- a/main.dox
+++ b/main.dox
@@ -20,6 +20,19 @@
 
  */
 
+/*! \dir fcmp
+ *  \brief Macros for generating FCMP functions
+ *  \details These macros have the following attributes:
+
+        * Macro name matches compiled function / subroutine name
+        * Prefixes:  _mcf_, _mcs_
+
+    The macro part is just a wrapper for the underlying function / subroutine,
+    and has switches for including the proc fcmp / quit statements and whether
+    to insert the package into the CMPLIB option.
+
+ */
+
 /*! \dir meta
  *  \brief Metadata Aware Macros
  *  \details These macros have the following attributes:
diff --git a/sasjs/sasjsconfig.json b/sasjs/sasjsconfig.json
index ef34a51..a3d2bff 100644
--- a/sasjs/sasjsconfig.json
+++ b/sasjs/sasjsconfig.json
@@ -2,11 +2,13 @@
   "$schema": "https://cli.sasjs.io/sasjsconfig-schema.json",
   "macroFolders": [
     "base",
+    "fcmp",
     "meta",
     "metax",
     "viya",
     "lua",
-    "tests/base"
+    "tests/base",
+    "tests/fcmp"
   ],
   "docConfig": {
     "displayMacroCore": false,
diff --git a/tests/fcmp/mcf_string2file.test.sas b/tests/fcmp/mcf_string2file.test.sas
new file mode 100644
index 0000000..7b58bac
--- /dev/null
+++ b/tests/fcmp/mcf_string2file.test.sas
@@ -0,0 +1,52 @@
+/**
+  @file
+  @brief Testing mm_webout macro
+
+  <h4> SAS Macros </h4>
+  @li mcf_string2file.sas
+  @li mp_assert.sas
+
+**/
+
+
+%mcf_string2file(wrap=YES, insert_cmplib=YES)
+
+data _null_;
+  rc=mcf_string2file(
+    "%sysfunc(pathname(work))/newfile.txt"
+    , "line1"
+    , "APPEND");
+  rc=mcf_string2file(
+    "%sysfunc(pathname(work))/newfile.txt"
+    , "line2"
+    , "APPEND");
+run;
+
+data _null_;
+  infile "%sysfunc(pathname(work))/newfile.txt";
+  input;
+  if _n_=2 then call symputx('val',_infile_);
+run;
+
+%mp_assert(
+  iftrue=(%str(&val)=%str(line2)),
+  desc=Check if APPEND works
+)
+
+data _null_;
+  rc=mcf_string2file(
+    "%sysfunc(pathname(work))/newfile.txt"
+    , "creating"
+    , "CREATE");
+run;
+
+data _null_;
+  infile "%sysfunc(pathname(work))/newfile.txt";
+  input;
+  if _n_=1 then call symputx('val2',_infile_);
+run;
+
+%mp_assert(
+  iftrue=(%str(&val2)=%str(creating)),
+  desc=Check if CREATE works
+)
\ No newline at end of file