diff --git a/include/processing.hpp b/include/processing.hpp
index 84ba12b..dc51260 100644
--- a/include/processing.hpp
+++ b/include/processing.hpp
@@ -41,7 +41,7 @@ void varmap_get(_obj* in, std::regex const& exclude);
 void fctmap_get(_obj* in, std::regex const& exclude);
 void cmdmap_get(_obj* in, std::regex const& exclude);
 
-/** functions **/
+/** util functions **/
 
 // gen regexes
 std::regex var_exclude_regex(std::string const& in, bool include_reserved);
@@ -67,4 +67,8 @@ bool r_get_fct(_obj* in, countmap_t* fct_map);
 bool r_delete_fct(_obj* in, set_t* fcts);
 bool r_delete_var(_obj* in, set_t* vars);
 
+/** Processing **/
+
+void add_unset_variables(shmain* sh, std::regex const& exclude);
+
 #endif //PROCESSING_HPP
diff --git a/include/struc.hpp b/include/struc.hpp
index 8168987..7447686 100644
--- a/include/struc.hpp
+++ b/include/struc.hpp
@@ -116,7 +116,8 @@ public:
 
   // return if is a string and only one subarg
   std::string string();
-  bool equals(std::string const& in) { return this->string() == in; }
+
+  inline bool equals(std::string const& in) { return this->string() == in; }
 
   std::string generate(int ind);
 };
@@ -129,6 +130,7 @@ class arglist : public _obj
 {
 public:
   arglist() { type=_obj::_arglist; }
+  arglist(arg* in) { type=_obj::_arglist; this->add(in); }
   ~arglist() { for( auto it: args ) delete it; }
   inline void add(arg* in) { args.push_back(in); }
   inline void push_back(arg* in) { args.push_back(in); }
@@ -192,7 +194,9 @@ public:
 class condlist : public _obj
 {
 public:
-  condlist(pipeline* pl=nullptr) { type=_obj::_condlist; parallel=false; if(pl!=nullptr) this->add(pl); }
+  condlist() { type=_obj::_condlist; parallel=false; }
+  condlist(pipeline* pl);
+  condlist(block* bl);
   ~condlist() { for(auto it: pls) delete it; }
 
   bool parallel; // & at the end
@@ -256,6 +260,8 @@ public:
 
   size_t arglist_size();
 
+  void add_arg(arg* in);
+
   // preceding var assigns
   std::vector<std::pair<std::string,arg*>> var_assigns;
 
diff --git a/src/main.cpp b/src/main.cpp
index e4b5290..95adffe 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -149,6 +149,7 @@ int main(int argc, char* argv[])
     }
 
     // processing before output
+    // minimize
     if(options['m'])
       opt_minimize=true;
     if(options["remove-unused"])
@@ -157,6 +158,9 @@ int main(int argc, char* argv[])
       minimize_var( sh, re_var_exclude );
     if(options["minimize-fct"])
       minimize_fct( sh, re_fct_exclude );
+    // other processing
+    if(options["unset-var"])
+      add_unset_variables( sh, re_var_exclude );
 
     if(options["list-var"])
       list_vars(sh, re_var_exclude);
diff --git a/src/options.cpp b/src/options.cpp
index 5cd5e61..078a6e7 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -37,8 +37,8 @@ ztd::option_set gen_options()
       ztd::option("list-var-call",      false, "List all variables invoked in the script"),
       ztd::option("list-fct",           false, "List all functions defined in the script"),
       ztd::option("list-cmd",           false, "List all commands invoked in the script"),
-      ztd::option("remove-unused",      false, "Remove unused functions and variables")
-      // ztd::option("unset-var",          false, "Add 'unset' to all vars at the start of the script to avoid environment interference")
+      ztd::option("remove-unused",      false, "Remove unused functions and variables"),
+      ztd::option("unset-var",          false, "Add 'unset' to all vars at the start of the script to avoid environment interference")
   );
   return ret;
 }
diff --git a/src/processing.cpp b/src/processing.cpp
index a4a1c0d..a6a12a8 100644
--- a/src/processing.cpp
+++ b/src/processing.cpp
@@ -227,6 +227,22 @@ void list_cmds(_obj* in, std::regex const& exclude)
   list_map(m_cmds);
 }
 
+/** FUNCTIONS **/
+
+void add_unset_variables(shmain* sh, std::regex const& exclude)
+{
+  varmap_get(sh, exclude);
+  if(m_vars.size()>0)
+  {
+    cmd* unset_cmd = new cmd;
+    unset_cmd->add_arg(new arg("unset"));
+    for(auto it: m_vars)
+      unset_cmd->add_arg(new arg(it.first));
+    condlist* cl = new condlist(unset_cmd);
+    sh->lst->cls.insert(sh->lst->cls.begin(), cl);
+  }
+}
+
 /** RECURSIVES **/
 
 // GET //
diff --git a/src/struc.cpp b/src/struc.cpp
index 3f7cac3..4da20e7 100644
--- a/src/struc.cpp
+++ b/src/struc.cpp
@@ -9,17 +9,6 @@ std::string g_origin="";
 
 const std::string cmd::empty_string="";
 
-cmd* make_cmd(std::vector<std::string> args)
-{
-  cmd* ret = new cmd();
-  ret->args = new arglist();
-  for(auto it: args)
-  {
-    ret->args->add(new arg(it));
-  }
-  return ret;
-}
-
 std::vector<std::string> arglist::strargs(uint32_t start)
 {
   std::vector<std::string> ret;
@@ -48,7 +37,6 @@ std::string arg::string()
   return dynamic_cast<string_subarg*>(sa[0])->val;
 }
 
-
 void condlist::prune_first_cmd()
 {
   if(pls.size()>0 && pls[0]->cmds.size()>0)
diff --git a/src/struc_helper.cpp b/src/struc_helper.cpp
new file mode 100644
index 0000000..03ebc19
--- /dev/null
+++ b/src/struc_helper.cpp
@@ -0,0 +1,34 @@
+#include "struc.hpp"
+
+cmd* make_cmd(std::vector<std::string> args)
+{
+  cmd* ret = new cmd();
+  ret->args = new arglist();
+  for(auto it: args)
+  {
+    ret->args->add(new arg(it));
+  }
+  return ret;
+}
+
+condlist::condlist(pipeline* pl)
+{
+  type=_obj::_condlist;
+  parallel=false;
+  if(pl!=nullptr) this->add(pl);
+}
+
+condlist::condlist(block* bl)
+{
+  type=_obj::_condlist;
+  parallel=false;
+  this->add(new pipeline(bl));
+}
+
+void cmd::add_arg(arg* in)
+{
+  if(args==nullptr)
+    args = new arglist;
+
+  args->push_back(in);
+}