diff --git a/.gitignore b/.gitignore
index a6e760d..c538562 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /run-tests.sh
 /Zmakefile
 /TODO
+/lxsh
diff --git a/include/options.hpp b/include/options.hpp
index 45f724d..012207a 100644
--- a/include/options.hpp
+++ b/include/options.hpp
@@ -6,6 +6,8 @@
 extern ztd::option_set options;
 
 extern bool opt_minimize;
+extern bool piped; // for cd in substitutions
+
 
 ztd::option_set gen_options();
 void print_help(const char* arg0);
diff --git a/include/struc.hpp b/include/struc.hpp
index f9bc0ef..46ac262 100644
--- a/include/struc.hpp
+++ b/include/struc.hpp
@@ -11,13 +11,16 @@
 /*
 structure:
 
+list_t : condlist[]
+
 block:
 - group
-  - brace:  condlist[]
-  - subsh:  condlist[]
+  - brace:  list_t
+  - subsh:  list_t
 - cmd: arglist[]
-- if
-  - pair<condlist[]>[]
+- case
+  - arg                (input)
+  - pair<arg,list_t>[] (cases)
 
 condlist:
   pipeline[]
@@ -30,14 +33,11 @@ arglist:
 
 arg:
 - raw
-- subarg[]
+- subarg[]      split into subarguments in case of subshells
 
 subarg:
 - raw
-- variable
-- block: subshell
-
-
+- block: subshell (substitution)
 */
 
 #define AND_OP false
@@ -49,6 +49,7 @@ class pipeline;
 class arg;
 class subarg;
 
+// type pack of condlist
 typedef std::vector<condlist> list_t;
 
 block make_cmd(std::vector<std::string> args);
@@ -63,11 +64,14 @@ public:
 
   void setstring(std::string const& str);
 
+  // has to be set manually
   std::string raw;
 
   std::vector<subarg> sa;
 
+  // return if is a string and only one subarg
   std::string string();
+
   std::string generate(int ind);
 };
 
@@ -99,12 +103,17 @@ public:
 class block
 {
 public:
+  // type
   enum blocktype { none, subshell, brace, main, cmd, function, case_block, for_block, if_block, while_block};
+  blocktype type;
+
+  // ctor
   block() { type=none; }
   block(blocktype in) { type=in; }
-  blocktype type;
+
   // subshell/brace/main
   list_t cls;
+
   // cmd
   arglist args;
 
@@ -143,12 +152,13 @@ public:
   condlist() { parallel=false; }
   condlist(block const& pl) { parallel=false; this->add(pl);}
   condlist(pipeline const& pl) { parallel=false; this->add(pl);}
-  void add(pipeline const& pl, bool or_op=false);
 
-  bool parallel;
-  // don't push_back here
-  std::vector<bool> or_ops;
+  bool parallel; // & at the end
+
+  void add(pipeline const& pl, bool or_op=false);
+  // don't push_back here, use add() instead
   std::vector<pipeline> pls;
+  std::vector<bool> or_ops; // size of 1 less than pls, defines separator between pipelines
 
   std::string generate(int ind);
 };
@@ -157,12 +167,15 @@ public:
 class subarg
 {
 public:
+  // type
   enum argtype { string, subshell };
+  argtype type;
+
+  // ctor
   subarg(argtype in) { this->type=in; }
   subarg(std::string const& in="") { type=string; val=in; }
   subarg(block const& in) { type=subshell; sbsh=in; }
 
-  argtype type;
   // raw string
   std::string val;
   // subshell
diff --git a/include/util.hpp b/include/util.hpp
index 9c1ae99..e86e45a 100644
--- a/include/util.hpp
+++ b/include/util.hpp
@@ -21,7 +21,8 @@ template<typename ... Args>
 std::string strf( const std::string& format, Args ... args )
 {
     size_t size = snprintf( nullptr, 0, format.c_str(), args ... ) + 1; // Extra space for '\0'
-    if( size <= 0 ){ throw std::runtime_error( "Error during formatting." ); }
+    if( size <= 0 )
+      throw std::runtime_error( "Error during formatting." );
     std::unique_ptr<char[]> buf( new char[ size ] );
     snprintf( buf.get(), size, format.c_str(), args ... );
     return std::string( buf.get(), buf.get() + size - 1 ); // We don't want the '\0' inside
@@ -29,4 +30,10 @@ std::string strf( const std::string& format, Args ... args )
 
 std::string delete_brackets(std::string const& in);
 
+std::string pwd();
+
+void _exec(std::string const& bin, std::vector<std::string> const& args);
+
+std::string stringReplace(std::string subject, const std::string& search, const std::string& replace);
+
 #endif //UTIL_HPP
diff --git a/lxsh b/lxsh
deleted file mode 100755
index 65272ee..0000000
Binary files a/lxsh and /dev/null differ
diff --git a/src/generate.cpp b/src/generate.cpp
index 25848bb..be56a6f 100644
--- a/src/generate.cpp
+++ b/src/generate.cpp
@@ -6,6 +6,8 @@
 #include "options.hpp"
 #include "parse.hpp"
 
+#include <unistd.h>
+
 std::vector<std::string> included;
 
 bool is_sub_special_cmd(std::string in)
@@ -99,10 +101,24 @@ std::string concatargs(std::vector<std::string> args)
 
 std::string generate_resolve(std::vector<std::string> args, int ind)
 {
+  std::string ret;
+
   auto opts=create_resolve_opts();
   auto rargs = opts.process(args, false, true, false);
 
   std::string cmd=concatargs(rargs);
+  std::string dir;
+
+  if(!opts['C'] && !piped)
+  {
+    dir=pwd();
+    std::string cddir=ztd::exec("dirname", g_origin).first;
+    cddir.pop_back();
+    chdir(cddir.c_str());
+  }
+
+
+  // exec call
   auto p=ztd::shp("exec "+cmd);
 
   if(!opts['f'] && p.second!=0)
@@ -114,17 +130,29 @@ std::string generate_resolve(std::vector<std::string> args, int ind)
 
   if(opts['p'])
   {
-    block bl = parse(p.first);
-    std::string ret = bl.generate(ind, false);
+    block bl;
+    try
+    {
+      bl = parse(p.first);
+    }
+    catch(ztd::format_error& e)
+    {
+      throw ztd::format_error(e.what(), "command `"+cmd+'`', e.data(), e.where());
+    }
+    ret = bl.generate(ind, false);
     std::string tmpind=INDENT;
     ret = ret.substr(tmpind.size());
     ret.pop_back(); // remove \n
-    return ret;
   }
   else
   {
-    return p.first;
+    ret = p.first;
   }
+
+  if(!opts['C'] && !piped)
+    chdir(dir.c_str());
+
+  return ret;
 }
 
 std::string generate_include(std::vector<std::string> args, int ind)
@@ -140,6 +168,17 @@ std::string generate_include(std::vector<std::string> args, int ind)
   else if(opts['d'])
     quote = '"';
 
+  std::string curfile=g_origin;
+  std::string dir;
+
+  if(!opts['C'] && !piped)
+  {
+    dir=pwd();
+    std::string cddir=ztd::exec("dirname", curfile).first;
+    cddir.pop_back();
+    chdir(cddir.c_str());
+  }
+
   // do shell resolution
   std::string command="for I in ";
   for(auto it: rargs)
@@ -149,6 +188,7 @@ std::string generate_include(std::vector<std::string> args, int ind)
 
   auto v = split(inc, '\n');
 
+
   std::string file;
   block bl;
   bool indent_remove=true;
@@ -159,10 +199,13 @@ std::string generate_include(std::vector<std::string> args, int ind)
         add_include(it) ) // not already included
     {
       file=import_file(it);
+      if(opts['e'])
+        file = stringReplace(file, "\"", "\\\"");
       if(opts['r'])
         ret += file;
       else
       {
+        g_origin=it;
         try
         {
           bl = parse(quote + file + quote);
@@ -182,6 +225,9 @@ std::string generate_include(std::vector<std::string> args, int ind)
       }
     }
   }
+  if(!opts['C'] && !piped)
+    chdir(dir.c_str());
+  g_origin=curfile;
 
   if(!opts['r'])
     ret.pop_back();
@@ -215,13 +261,17 @@ std::string block::generate_case(int ind)
   ind++;
   for(auto cs: this->cases)
   {
+    // case definition : foo)
     if(!opt_minimize) ret += INDENT;
     ret += cs.first.generate(ind) + ')';
     if(!opt_minimize) ret += '\n';
+    // commands
     for(auto it: cs.second)
       ret += it.generate(ind+1);
+    // end of case: ;;
     if(opt_minimize)
     {
+      // ;; can be right after command
       if(ret[ret.size()-1] == '\n')
         ret.pop_back();
     }
@@ -233,6 +283,7 @@ std::string block::generate_case(int ind)
     }
     ret += ";;\n";
   }
+  // close case
   ind--;
   if(!opt_minimize) ret += INDENT;
   ret += "esac";
@@ -251,25 +302,30 @@ std::string block::generate(int ind, bool print_shebang)
   {
     if(type==function)
     {
+      // function definition
       ret += shebang + "()";
       if(!opt_minimize) ret += '\n' + INDENT;
-        ret += "{\n";
+      ret += "{\n";
+      // commands
       for(auto it: cls)
         ret += it.generate(ind+1);
-      if(!opt_minimize)
-        ret += INDENT;
+      if(!opt_minimize) ret += INDENT;
+      // end function
       ret += '}';
     }
     else if(type==subshell)
     {
+      // open subshell
       ret += '(';
       if(!opt_minimize) ret += '\n';
+      // commands
       for(auto it: cls)
         ret += it.generate(ind+1);
       if(opt_minimize)
-        ret.pop_back();
+        ret.pop_back(); // ) can be right after command
       else
         ret += INDENT;
+      // close subshell
       ret += ')';
     }
     else if(type==brace)
diff --git a/src/main.cpp b/src/main.cpp
index 7d4deef..2c940e3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -7,18 +7,19 @@
 
 #include <unistd.h>
 
+#include "util.hpp"
 #include "struc.hpp"
 #include "parse.hpp"
 #include "options.hpp"
 
 int main(int argc, char* argv[])
 {
-  auto args=options.process(argc, argv);
+  auto args=options.process(argc, argv, false, true);
 
   if(options['m'])
     opt_minimize=true;
 
-  bool piped=false;
+  piped=false;
 
   if(options['h'])
   {
@@ -58,34 +59,48 @@ int main(int argc, char* argv[])
     }
   }
 
-  if(!piped && !options['C'])
-  {
-    std::string dir=ztd::exec("dirname", file).first;
-    dir.pop_back();
-    file=ztd::exec("basename", file).first;
-    file.pop_back();
-    chdir(dir.c_str());
-  }
-
   g_origin=file;
   add_include(file);
 
-  if(args.size()>0)
+  try
   {
-    try
+    block sh(parse(import_file(file)));
+    if(options['E'])
+    {
+      std::string data=sh.generate();
+      // generate path
+      std::string tmpdir = (getenv("TMPDIR") != NULL) ? getenv("TMPDIR") : "/tmp" ;
+      std::string filepath = tmpdir + "/lxsh_exec_" + ztd::sh("tr -dc '[:alnum:]' < /dev/urandom | head -c10");
+      // create stream
+      std::ofstream stream(filepath);
+      if(!stream)
+        throw std::runtime_error("Failed to write to file '"+filepath+'\'');
+
+      // output
+      stream << data;
+      stream.close();
+      auto p = ztd::exec("chmod", "+x", filepath);
+      if(p.second != 0)
+        return p.second;
+
+      args.erase(args.begin());
+      _exec(filepath, args);
+
+    }
+    else
     {
-      block sh(parse(import_file(file)));
       std::cout << sh.generate();
     }
-    catch(ztd::format_error& e)
-    {
-      printFormatException(e);
-    }
-    catch(std::exception& e)
-    {
-      std::cerr << e.what() << std::endl;
-    }
   }
+  catch(ztd::format_error& e)
+  {
+    printFormatException(e);
+  }
+  catch(std::exception& e)
+  {
+    std::cerr << e.what() << std::endl;
+  }
+
 
   return 0;
 }
diff --git a/src/options.cpp b/src/options.cpp
index fa0c6e0..a3a6ce2 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -2,13 +2,15 @@
 
 ztd::option_set options = gen_options();
 bool opt_minimize;
+bool piped=false;
+
 
 ztd::option_set gen_options()
 {
   ztd::option_set ret;
   ret.add(ztd::option('h', "help",     false, "Display this help message"));
   ret.add(ztd::option('m', "minimize", false, "Minimize code"));
-  ret.add(ztd::option('C', "no-cd",    false, "Don't change directories"));
+  ret.add(ztd::option('E', "exec",     false, "Directly exec instead of outputting"));
   ret.add(ztd::option("help-commands", false, "Print help for linker commands"));
   return ret;
 }
@@ -19,8 +21,9 @@ ztd::option_set create_include_opts()
   opts.add(
     ztd::option('s', false, "Single quote contents"),
     ztd::option('d', false, "Double quote contents"),
-    // ztd::option('e', false, "Escape for double quotes"),
+    ztd::option('e', false, "Escape double quotes"),
     ztd::option('r', false, "Include raw contents, don't parse"),
+    ztd::option('C', false, "Don't cd to folder the file is in"),
     ztd::option('f', false, "Force include even if already included. Don't count as included")
   );
   return opts;
@@ -30,8 +33,8 @@ ztd::option_set create_resolve_opts()
 {
   ztd::option_set opts;
   opts.add(
-    // ztd::option('e', false, "Escape for double quotes"),
     ztd::option('p', false, "Parse contents as shell code"),
+    ztd::option('C', false, "Don't cd to folder this file is in"),
     ztd::option('f', false, "Ignore non-zero return values")
   );
   return opts;
@@ -39,7 +42,7 @@ ztd::option_set create_resolve_opts()
 
 void print_help(const char* arg0)
 {
-  printf("%s [options] [file]\n", arg0);
+  printf("%s [options] <file> [arg...]\n", arg0);
   printf("Link extended shell, allows file including and command resolving\n");
   printf("See --help-commands for help on linker commands\n");
   printf("\n");
@@ -50,7 +53,7 @@ void print_help(const char* arg0)
 void print_include_help()
 {
   printf("%%include [options] <file...>\n");
-  printf("Include the targeted files. Paths are relative to folder of current file\n");
+  printf("Include the targeted files, from folder of current file\n");
   printf(" - Regular shell processing applies to the file arguments\n");
   printf(" - Only includes not already included files\n");
   printf(" - `%%include` in command substitutions replaces the substitution\n");
@@ -64,7 +67,7 @@ void print_include_help()
 void print_resolve_help()
 {
   printf("%%resolve [options] <command...>\n");
-  printf("Execute shell command and substitute output. Paths is from folder of current file\n");
+  printf("Execute shell command and substitute output, from folder of current file\n");
   printf(" - Fails if return value is not 0. Can be ignored with -f\n");
   printf(" - `%%resolve` in command substitutions replaces the substitution\n");
   printf(" =>`%%resolve_s` can be used inside a substitution to prevent this\n");
diff --git a/src/parse.cpp b/src/parse.cpp
index 39e4351..8af1df0 100644
--- a/src/parse.cpp
+++ b/src/parse.cpp
@@ -241,7 +241,9 @@ std::pair<condlist, uint32_t> parse_condlist(const char* in, uint32_t size, uint
   return std::make_pair(ret, i);
 }
 
-// parse condlists until )
+// parse a subshell
+// must start right after the opening (
+// ends at ) and nothing else
 std::pair<block, uint32_t> parse_subshell(const char* in, uint32_t size, uint32_t start)
 {
   uint32_t i = skip_unread(in, size, start);
@@ -258,7 +260,9 @@ std::pair<block, uint32_t> parse_subshell(const char* in, uint32_t size, uint32_
   return std::make_pair(ret,i);
 }
 
-// parse condlists until }
+// parse a brace block
+// must start right after the opening {
+// ends at } and nothing else
 std::pair<block, uint32_t> parse_brace(const char* in, uint32_t size, uint32_t start)
 {
   uint32_t i = skip_unread(in, size, start);
@@ -279,6 +283,9 @@ std::pair<block, uint32_t> parse_brace(const char* in, uint32_t size, uint32_t s
   return std::make_pair(ret,i);
 }
 
+// parse a functions
+// must start right after the ()
+// then parses a brace block
 std::pair<block, uint32_t> parse_function(const char* in, uint32_t size, uint32_t start)
 {
   block ret(block::function);
@@ -301,16 +308,18 @@ std::pair<block, uint32_t> parse_cmd(const char* in, uint32_t size, uint32_t sta
   block ret(block::cmd);
   uint32_t i=start;
 
+  // parse first arg and keep it
   auto tp=parse_arg(in, size, i);
   i=skip_unread(in, size, tp.second);
-  if(word_eq("()", in, size, i))
+  if(word_eq("()", in, size, i)) // is a function
   {
     i += 2;
     auto pp = parse_function(in, size, i);
+    // first arg is function name
     pp.first.shebang = tp.first.raw;
     return pp;
   }
-  else
+  else // is a command
   {
     auto pp=parse_arglist(in, size, start);
     ret.args = pp.first;
@@ -320,16 +329,20 @@ std::pair<block, uint32_t> parse_cmd(const char* in, uint32_t size, uint32_t sta
   return std::make_pair(ret, i);
 }
 
+// parse a case block
+// must start right after the case
+// ends at } and nothing else
 std::pair<block, uint32_t> parse_case(const char* in, uint32_t size, uint32_t start)
 {
   block ret(block::case_block);
-  uint32_t i=start;
+  uint32_t i=skip_unread(in, size, start);;
 
-  auto pa = parse_arg(in, size, i); // case arg
+  // get the treated argument
+  auto pa = parse_arg(in, size, i);
   ret.carg = pa.first;
   i=skip_unread(in, size, pa.second);
 
-
+  // must be an 'in'
   if(!word_eq("in", in, size, i))
   {
     auto pp=parse_arg(in, size, i);
@@ -338,6 +351,7 @@ std::pair<block, uint32_t> parse_case(const char* in, uint32_t size, uint32_t st
 
   i=skip_unread(in, size, i+2);
 
+  // parse all cases
   while(i<size && !word_eq("esac", in, size, i, " \t\n;()&") )
   {
     // toto)
@@ -361,18 +375,21 @@ std::pair<block, uint32_t> parse_case(const char* in, uint32_t size, uint32_t st
       if(in[i] == ')')
         throw ztd::format_error( strf("Unexpected token '%c', expecting ';;'", in[i]), g_origin, in, i );
 
+      // end of case: on same line
       if(in[i-1] == ';' && in[i] == ';')
       {
         i++;
         break;
       }
 
+      // end of case: on new line
       i=skip_unread(in, size, i);
       if(word_eq(";;", in, size, i))
       {
         i+=2;
         break;
       }
+      // end of block: ignore missing ;;
       if(word_eq("esac", in, size, i))
         break;
 
@@ -381,6 +398,7 @@ std::pair<block, uint32_t> parse_case(const char* in, uint32_t size, uint32_t st
     ret.cases.push_back(cc);
   }
 
+  // ended before finding esac
   if(i>=size)
     throw ztd::format_error("Expecting 'esac'", g_origin, in, i);
   i+=4;
@@ -405,8 +423,7 @@ std::pair<block, uint32_t> parse_block(const char* in, uint32_t size, uint32_t s
   }
   else if(word_eq("case", in, size, i))
   {
-    i = skip_unread(in, size, i+4);
-    ret = parse_case(in, size, i);
+    ret = parse_case(in, size, i+4);
   }
   else // command
   {
@@ -424,15 +441,16 @@ std::pair<block, uint32_t> parse_block(const char* in, uint32_t size, uint32_t s
 // parse main
 block parse(const char* in, uint32_t size)
 {
-
   block ret(block::main);
   uint32_t i=0;
+  // get shebang
   if(word_eq("#!", in, size, 0))
   {
     i=skip_until(in, size, 0, "\n");
     ret.shebang=std::string(in, i);
   }
   i = skip_unread(in, size, i);
+  // parse all commands
   while(i<size)
   {
     auto pp=parse_condlist(in, size, i);
@@ -442,6 +460,7 @@ block parse(const char* in, uint32_t size)
   return ret;
 }
 
+// import a file's contents into a string
 std::string import_file(std::string const& path)
 {
   std::ifstream st(path);
diff --git a/src/struc.cpp b/src/struc.cpp
index 891ecce..e398677 100644
--- a/src/struc.cpp
+++ b/src/struc.cpp
@@ -2,6 +2,8 @@
 
 #include "util.hpp"
 
+#include <unistd.h>
+
 block make_cmd(std::vector<std::string> args)
 {
   block cmd(block::cmd);
@@ -24,6 +26,7 @@ void arg::setstring(std::string const& str)
 {
   sa.resize(0);
   sa.push_back(subarg(str));
+  raw = str;
 }
 
 void condlist::add(pipeline const& pl, bool or_op)
diff --git a/src/util.cpp b/src/util.cpp
index 85e3cef..5560a44 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -1,5 +1,9 @@
 #include "util.hpp"
 
+#include <unistd.h>
+
+#include <ztd/shell.hpp>
+
 std::string indenting_string="\t";
 
 std::string indent(int n)
@@ -52,3 +56,36 @@ std::string delete_brackets(std::string const& in)
   }
   return ret;
 }
+
+std::string pwd()
+{
+  char buf[2048];
+  if(getcwd(buf, 2048) != NULL)
+  {
+    std::string ret=ztd::exec("pwd").first; // getcwd failed: call pwd
+    ret.pop_back();
+    return ret;
+  }
+  return std::string(buf);
+}
+
+void _exec(std::string const& bin, std::vector<std::string> const& args)
+{
+  std::vector<char*> rargs;
+  rargs.push_back((char*) bin.c_str());
+  for(auto it=args.begin(); it!=args.end(); it++)
+    rargs.push_back((char*) it->c_str());
+  rargs.push_back(NULL);
+  execvp(bin.c_str(), rargs.data());
+}
+
+std::string stringReplace(std::string subject, const std::string& search, const std::string& replace)
+{
+  size_t pos = 0;
+  while ((pos = subject.find(search, pos)) != std::string::npos)
+  {
+    subject.replace(pos, search.length(), replace);
+    pos += replace.length();
+  }
+  return subject;
+}