diff --git a/.gitignore b/.gitignore
index 7d67073..b354dbd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,4 @@ infile
 outfile
 mallocfail_hashes
 compile_flags.txt
+bash.txt
diff --git a/NOTES.md b/NOTES.md
index 9c29569..a0ed688 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -2,7 +2,9 @@
 
 cf. [Bash Reference Manual](https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html)
 
-Comparative testing with bash should be done with bash --norc --posix.
+Comparative testing with bash should be done with bash --norc.
+
+In case of difference between regular bash and posix bash, we decide to follow regular bash.
 
 ## Ideas for testing
 * use prysk or shellspec with shell=./minishell
@@ -16,6 +18,22 @@ $ echo PRYSK12345 2 $?
 PRYSK12345 2 0
 ```
 
+## Usefull resources
+
+[Bash Reference Manual](https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html)
+
+[Internal parsing & flow](https://mail.gnu.org/archive/html/help-bash/2014-01/msg00000.html)
+
+[Python parser for bash](https://github.com/idank/bashlex)
+
+[The Stages of Word Expansion](https://www.gnu.org/software/libc/manual/html_node/Expansion-Stages.html)
+
+[Diagram of bash parse flow](https://web.archive.org/web/20160308045823/https://stuff.lhunath.com/parser.png)
+
+[The Bash Parser](http://mywiki.wooledge.org/BashParser)
+
+[The Architecture of Open Source Applications (Volume 1) The Bourne-Again Shell](https://aosabook.org/en/v1/bash.html)
+
 ## Shell Operation
 
 cf. 3.1.1 Shell Operation
@@ -28,6 +46,13 @@ Parses the tokens into simple and compound commands (see *Shell Commands*)
 Performs the various _Shell Expansions_, breaking the expanded tokens into lists
 of filenames and commands and arguments.
 
+Performs any necessary _redirections_ and removes the **redirection operators**
+and their operands from the argument list.
+
+Executes the command (see _Command Execution_);
+
+Waits for the command to complete and collects its exit status (see _Exit Status_).
+
 ### Quoting Rules
 
 cf. 3.1.2 Quoting
@@ -52,9 +77,6 @@ cf. 3.1.2.3 Double Quotes
 
 Preserves the literal value of all characters within the quotes, with the exception of '$'.
 
-TODO: The special parameters ‘*’ and ‘@’ have special meaning when in double quotes (see Shell Parameter Expansion).
-See if we have to handle this
-
 Per the subject: minishell should not interpret unclosed quotes
 
 ### Shell Commands
@@ -217,6 +239,17 @@ The form is $VAR, where VAR may only contain the following characters:
 * _
 * 0-9 (not in the first character)
 
+Just noticed an interesting case:
+```shell
+bash-5.2$ VAR=hello # we set a shell variable (NOT environment variable)
+bash-5.2$ VAR=hi env | grep VAR=; env | grep VAR= # here VAR is an environment variable, which is only valid for the next command (the second env returns nothing, confirming that it is not valid for that command)
+VAR=hi
+bash-5.2$ env | grep VAR= # var is not an environment variable
+bash-5.2$ echo $VAR # but it is a shell variable
+hello
+```
+Luckily for us, we don't have to handle shell variables, nor do we have to handle `VAR=value` or `VAR=value cmd`.
+
 #### Word Splitting
 cf. 3.5.7 Word Splitting
 
@@ -282,12 +315,183 @@ bash-5.1$ ls *'*'there
 #### Quote Removal
 cf. 3.5.9 Quote Removal
 
-After the preceding expansions, all unquoted occurrences of the
-characters ''' and '"' that did not result from one of the above
-expansions are removed.
+After the preceding expansions, all unquoted occurrences of the characters '''
+and '"' that did not result from one of the above expansions are removed.
 
-## Subshell
+### Redirection
+cf. 3.6 Redirections
 
+Before a command is executed, its input and output may be "redirected" using a
+special notation interpreted by the shell.  "Redirection" allows commands' file
+handles to be made to refer to different files, and can change the files the
+command reads from and writes to.
+
+The redirection operators may precede or appear anywhere within a simple command
+or may follow a command.
+
+e.g. this is the correct behaviour
+```shell
+bash-5.1$ ls > hello.txt *here
+bash-5.1$ cat hello.txt
+hello*there
+hi*there
+noonethere
+```
+
+Redirections are processed in the order they appear, from left to right.
+
+e.g. this is the correct behaviour
+```shell
+bash-5.1$ ls > hello.txt share > here.txt *.txt
+bash-5.1$ ls -l hello.txt here.txt
+-rw-r--r-- 1 kcolin 2024_le-havre  0 Feb  7 15:54 hello.txt
+-rw-r--r-- 1 kcolin 2024_le-havre 68 Feb  7 15:54 here.txt
+bash-5.1$ cat here.txt
+hello.txt
+here.txt
+log.txt
+newlog-strict.txt
+newlog.txt
+
+share:
+man
+```
+
+'<' refers to the standard input (fd 0, STDIN\_FILENO)
+
+'>' refers to the standard output (fd 1, STDOUT\_FILENO)
+
+The word following the redirection operator, unless the redirection operator is
+'<<', is subjected to parameter expansion,  filename expansion, word splitting,
+and quote removal.
+
+If it expands to more than one word, Bash reports an error.
+
+This is the correct behaviour:
+```shell
+bash-5.1$ var="file1 file2"
+bash-5.1$ echo "hello world" > $var
+bash: $var: ambiguous redirect
+```
+
+If the variable is not defined, bash prints the following error:
+
+```shell
+bash-5.1$ echo "hello world" > $nonexist
+bash: $nonexist: ambiguous redirect
+```
+
+#### Here Documents
+cf. Bash Reference Manual 3.6.6 Here Documents
+
+This type of redirection instructs the shell to read input from the current
+source until a line containing only word (with no trailing blanks) is seen. All
+of the lines read up to that point are then used as the standard input for a
+command.
+
+No parameter and variable expansion, command substitution, arithmetic expansion,
+or filename expansion is performed on word. 
+
+If any part of word is quoted, the delimiter is the result of quote removal on
+word, and the lines in the here-document are not expanded. If word is unquoted,
+all lines of the here-document are subjected to parameter expansion.
+
+This is the correct behaviour for quoting and parameter expansion:
+```shell
+bash-5.2$ cat << EOF
+> hello
+> $$
+> EOF
+hello
+1491742
+bash-5.2$ cat << "EOF"
+> hello
+> $$
+> EOF
+hello
+$$
+bash-5.2$ cat << 'E'OF
+> hello
+> $$
+> EOF
+hello
+$$
+bash-5.2$ cat << $USER
+> hello
+> khais
+> $USER
+hello
+khais
+bash-5.2$ echo $USER
+khais
+bash-5.2$ cat << "$USER"
+> $USER
+```
+
+Subject says \\ is not required, so this behaviour we will not implement:
+```shell
+bash-5.2$ cat << EOF
+> hello \
+world
+> EOF
+hello world
+```
+
+### Executing Commands
+cf. 3.7 Executing Commands
+
+#### Simple Command Execution
+cf. 3.7.1 Simple Command Expansion
+
+When a simple command is executed, the shell performs the following
+expansions, assignments, and redirections, from left to right, in the
+following order.
+
+  1. The words that the parser has marked as redirections are saved for later
+     processing.
+
+  2. The words that are not redirections are expanded (see _Shell Expansions_).
+     If any words remain after expansion, the first word is taken to be the name
+     of the command and the remaining words are the arguments.
+
+  3. Redirections are performed as described above (see _Redirections_).
+
+If no command name results, redirections are performed, but do not affect the
+current shell environment.  A redirection error causes the command to exit with
+a non-zero status.
+
+If there is a command name left after expansion, execution proceeds as described
+below.  Otherwise, the command exits with a status of zero.
+
+#### Command Search and Execution
+cf. 3.7.2 Command Search and Execution
+
+After a command has been split into words, if it results in a simple command and
+an optional list of arguments, the following actions are taken.
+
+  1. The shell searches for it in the list of shell builtins.  If a match is
+     found, that builtin is invoked.
+
+  2. If the name is not a builtin, and contains no slashes, Bash searches each
+     element of '$PATH' for a directory containing an executable file by that
+     name.  If the search is unsuccessful, the shell prints an error message and
+     returns an exit status of 127.
+
+  3. If the search is successful, or if the command name contains one or more
+     slashes, the shell executes the named program in a separate execution
+     environment.  Argument 0 is set to the name given, and the remaining
+     arguments to the command are set to the arguments supplied, if any.
+
+  4. If this execution fails because the file is not in executable format, and
+     the file is not a directory, it is assumed to be a "shell script" and the
+     shell executes it as described in _Shell Scripts_.
+
+     NOTE: we will _maybe_ implement this, we will see. It does not seem to be
+     required.
+
+  5. The shell waits for the command to complete and collects its exit status.
+
+#### Subshell
 cf. 3.7.3 Command Execution Environment
 
 The shell has an execution environment, which consists of the following:
@@ -303,30 +507,66 @@ execution environment.
 
 A subshell is a copy of the shell process.
 
-## Here Documents
-cf. Bash Reference Manual 3.6.6 Here Documents
+#### Environment
+cf. 3.7.4 Environment
 
-This type of redirection instructs the shell to read input from the current
-source until a line containing only word (with no trailing blanks) is seen. All
-of the lines read up to that point are then used as the standard input for a
-command.
+When a program is invoked it is given an array of strings called the
+"environment".  This is a list of name-value pairs, of the form 'name=value'.
 
-TODO: The following paragraph may not apply fully to our project, check it again!
+Bash provides several ways to manipulate the environment.  On invocation, the
+shell scans its own environment and creates a parameter for each name found,
+automatically marking it for 'export' to child processes.  Executed commands
+inherit the environment.  The 'export' and 'unset' builtins allow parameters to
+be added to and deleted from the environment.  If the value of a parameter in
+the environment is modified using the 'export' builtin, the new value becomes
+part of the environment, replacing the old.  The environment inherited by any
+executed command consists of the shell's initial environment, whose values may
+be modified in the shell, less any pairs removed by the 'unset' builtin, plus
+any additions via the 'export' command.
 
-No parameter and variable expansion, command substitution, arithmetic expansion,
-or filename expansion is performed on word. If any part of word is quoted, the
-delimiter is the result of quote removal on word, and the lines in the
-here-document are not expanded. If word is unquoted, all lines of the
-here-document are subjected to parameter expansion, command substitution, and
-arithmetic expansion, the character sequence \newline is ignored, and ‘\’ must
-be used to quote the characters ‘\’, ‘$’, and ‘`’.
+#### Exit Status
+cf. 3.7.5 Exit Status
 
-## Signal handling
+The exit status of an executed command is the value returned by the 'waitpid'
+system call or equivalent function.  Exit statuses fall between 0 and 255,
+though, as explained below, the shell may use values above 125 specially.  Exit
+statuses from shell builtins and compound commands are also limited to this
+range.  Under certain circumstances, the shell will use special values to
+indicate specific failure modes.
 
-cf. 6.12 Shell Compatibility Mode => compat32
+For the shell's purposes, a command which exits with a zero exit status has
+succeeded.  A non-zero exit status indicates failure.  This seemingly
+counter-intuitive scheme is used so there is one well-defined way to indicate
+success and a variety of ways to indicate various failure modes.  When a command
+terminates on a fatal signal whose number is N, Bash uses the value 128+N as the
+exit status.
 
-interrupting a command list such as "a; b; c" causes the execution of the entire
-list to be aborted.
+If a command is not found, the child process created to execute it returns a
+status of 127.  If a command is found but is not executable, the return status
+is 126.
+
+If a command fails because of an error during expansion or redirection, the exit
+status is greater than zero.
+
+All of the Bash builtins return an exit status of zero if they succeed and a
+non-zero status on failure, so they may be used by the conditional and list
+constructs.  All builtins return an exit status of 2 to indicate incorrect
+usage, generally invalid options or missing arguments.
+
+The exit status of the last command is available in the special parameter $?.
+
+#### Signals
+cf. 3.7.6 Signals
+
+When Bash is interactive, it ignores 'SIGTERM' (so that 'kill 0' does not kill
+an interactive shell), and 'SIGINT' is caught and handled.  When Bash receives a
+'SIGINT', it breaks out of any executing loops.  In all cases, Bash ignores
+'SIGQUIT'.  Bash ignores 'SIGTTIN', 'SIGTTOU', and 'SIGTSTP'.
+
+NOTE: The behaviour on when ^C is printed seems strange, investigate further
+once we implement this
+
+TODO: investigate this further, this seems very complicated
 
 ## Definitions
 cf. [Bash Reference Manual](https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Definitions)
diff --git a/compile_flags.txt b/compile_flags.txt
new file mode 100644
index 0000000..2099b5d
--- /dev/null
+++ b/compile_flags.txt
@@ -0,0 +1,284 @@
+-fPIC
+  -Wformat
+  -Wformat-security
+  -Werror=format-security
+  -fzero-call-used-regs=used-gpr
+  -fstack-protector-strong
+  --param
+  ssp-buffer-size=4
+  -O2
+  -U_FORTIFY_SOURCE
+  -fwrapv
+  -target
+  x86_64-unknown-linux-gnu
+original flags to /nix/store/n266hs15lrsvb3h2nyiasj0gyxzxgxrc-clang-18.1.8/bin/clang:
+  -c
+  -Wall
+  -Wextra
+  -Werror
+  -g
+  -o
+  src/minishell.o
+  src/minishell.c
+extra flags after to /nix/store/n266hs15lrsvb3h2nyiasj0gyxzxgxrc-clang-18.1.8/bin/clang:
+  -U_FORTIFY_SOURCE
+  -D_FORTIFY_SOURCE=2
+  -B/nix/store/nqb2ns2d1lahnd5ncwmn6k84qfd7vx2k-glibc-2.40-36/lib/
+  -idirafter
+  /nix/store/lcxvgkg659vbvdq86mhxa599wn48f35c-glibc-2.40-36-dev/include
+  -B/nix/store/62qjb50708fdhb4f2y7zxyqr1afir4fk-gcc-13.3.0/lib/gcc/x86_64-unknown-linux-gnu/13.3.0
+  --gcc-toolchain=/nix/store/62qjb50708fdhb4f2y7zxyqr1afir4fk-gcc-13.3.0
+  -B/nix/store/flqqrbm3pv9mcxf7xg1j6ssmfwxwrsdx-clang-18.1.8-lib/lib
+  -resource-dir=/nix/store/z99smrlncwz340g79b3lils97qps9690-clang-wrapper-18.1.8/resource-root
+  -B/nix/store/wd1dlav3z5vwwv6yqj69xkzhldk5hpvb-binutils-wrapper-2.43.1/bin/
+  -frandom-seed=arjng27r1l
+  -isystem
+  /nix/store/jd82fkkcyi48pna0q2hjf0x929lsp6gb-llvm-18.1.8-dev/include
+  -isystem
+  /nix/store/jd82fkkcyi48pna0q2hjf0x929lsp6gb-llvm-18.1.8-dev/include
+  -isystem
+  /nix/store/69v6c64pn1ay26207b0cmzi40qpr9q0w-ncurses-6.4.20221231-dev/include
+  -isystem
+  /nix/store/69v6c64pn1ay26207b0cmzi40qpr9q0w-ncurses-6.4.20221231-dev/include
+  -isystem
+  /nix/store/06q0p7bhn2ffxxya20rrfqdib3h32csn-zlib-1.3.1-dev/include
+  -isystem
+  /nix/store/06q0p7bhn2ffxxya20rrfqdib3h32csn-zlib-1.3.1-dev/include
+  -isystem
+  /nix/store/zps3l0mc26r7bvjqd8x0y1lbc6gmbdvn-gnumake-4.4.1/include
+  -isystem
+  /nix/store/zps3l0mc26r7bvjqd8x0y1lbc6gmbdvn-gnumake-4.4.1/include
+  -isystem
+  /nix/store/kjgslpdqchx1sm7a5h9xibi5rrqcqfnl-python3-3.12.8/include
+  -isystem
+  /nix/store/kjgslpdqchx1sm7a5h9xibi5rrqcqfnl-python3-3.12.8/include
+  -isystem
+  /nix/store/jii2qmkiwlynzkxyq3ly0cqzv4pj46ng-gdb-15.2/include
+  -isystem
+  /nix/store/jii2qmkiwlynzkxyq3ly0cqzv4pj46ng-gdb-15.2/include
+  -isystem
+  /nix/store/baa844xjkr00jf4py0i9z5w9arf6bq7r-valgrind-3.23.0-dev/include
+  -isystem
+  /nix/store/baa844xjkr00jf4py0i9z5w9arf6bq7r-valgrind-3.23.0-dev/include
+  -isystem
+  /nix/store/v5x90j46fchzh3b891hcc1h3pajbcsc7-python3-3.10.16/include
+  -isystem
+  /nix/store/v5x90j46fchzh3b891hcc1h3pajbcsc7-python3-3.10.16/include
+  -isystem
+  /nix/store/nws87hfnn2sifdwa4r17ixr30zh8c739-compiler-rt-libc-18.1.8-dev/include
+  -isystem
+  /nix/store/nws87hfnn2sifdwa4r17ixr30zh8c739-compiler-rt-libc-18.1.8-dev/include
+  -isystem
+  /nix/store/p6ccnh6ahw1k9sjrly45l7nx12a2k5aj-compiler-rt-libc-12.0.1-dev/include
+  -isystem
+  /nix/store/p6ccnh6ahw1k9sjrly45l7nx12a2k5aj-compiler-rt-libc-12.0.1-dev/include
+  -isystem
+  /nix/store/13fw0scdl9ciz5lpabi9nkxwrnn8555g-libglvnd-1.7.0-dev/include
+  -isystem
+  /nix/store/13fw0scdl9ciz5lpabi9nkxwrnn8555g-libglvnd-1.7.0-dev/include
+  -isystem
+  /nix/store/ax75iyi15z98ygig0qmkwfyvj3c5h4jy-wayland-1.23.1-dev/include
+  -isystem
+  /nix/store/ax75iyi15z98ygig0qmkwfyvj3c5h4jy-wayland-1.23.1-dev/include
+  -isystem
+  /nix/store/9fyv534c1xp8rvx51zz3jv49cnxalydc-libXrandr-1.5.4-dev/include
+  -isystem
+  /nix/store/9fyv534c1xp8rvx51zz3jv49cnxalydc-libXrandr-1.5.4-dev/include
+  -isystem
+  /nix/store/xw159a07hd1z48pdkzv65l60j474z9p1-libXrender-0.9.11-dev/include
+  -isystem
+  /nix/store/xw159a07hd1z48pdkzv65l60j474z9p1-libXrender-0.9.11-dev/include
+  -isystem
+  /nix/store/x79ks3lk3a6d4z6bsma21fx04vrp0nqd-xorgproto-2024.1/include
+  -isystem
+  /nix/store/x79ks3lk3a6d4z6bsma21fx04vrp0nqd-xorgproto-2024.1/include
+  -isystem
+  /nix/store/2nq19mwkgxmb9npqb4vb7gzs3inpvs3x-libX11-1.8.10-dev/include
+  -isystem
+  /nix/store/2nq19mwkgxmb9npqb4vb7gzs3inpvs3x-libX11-1.8.10-dev/include
+  -isystem
+  /nix/store/94pix4pzamq3svx4jxjj2sgrvafn29b8-libxcb-1.17.0-dev/include
+  -isystem
+  /nix/store/94pix4pzamq3svx4jxjj2sgrvafn29b8-libxcb-1.17.0-dev/include
+  -isystem
+  /nix/store/k53lmh232zhcm5mf1gg717cj8aqmc65a-libXinerama-1.1.5-dev/include
+  -isystem
+  /nix/store/k53lmh232zhcm5mf1gg717cj8aqmc65a-libXinerama-1.1.5-dev/include
+  -isystem
+  /nix/store/4nib5gpv4ckmy9w2drj4g99bx5v0xxz5-libXcursor-1.2.2-dev/include
+  -isystem
+  /nix/store/4nib5gpv4ckmy9w2drj4g99bx5v0xxz5-libXcursor-1.2.2-dev/include
+  -isystem
+  /nix/store/npvyfw89qr7lyv03ng79bmrdc0bz2wly-libXi-1.8.2-dev/include
+  -isystem
+  /nix/store/npvyfw89qr7lyv03ng79bmrdc0bz2wly-libXi-1.8.2-dev/include
+  -isystem
+  /nix/store/gmnr6a33dbr978p4dzc8ck589z4ddwm2-libXfixes-6.0.1-dev/include
+  -isystem
+  /nix/store/gmnr6a33dbr978p4dzc8ck589z4ddwm2-libXfixes-6.0.1-dev/include
+  -isystem
+  /nix/store/sj3jfnpd35rv18z9b1gcjqzjgvff5hq6-libXext-1.3.6-dev/include
+  -isystem
+  /nix/store/sj3jfnpd35rv18z9b1gcjqzjgvff5hq6-libXext-1.3.6-dev/include
+  -isystem
+  /nix/store/y5yr09v8mph0lq610sla6c0z2j438ppi-libXau-1.0.11-dev/include
+  -isystem
+  /nix/store/y5yr09v8mph0lq610sla6c0z2j438ppi-libXau-1.0.11-dev/include
+  -isystem
+  /nix/store/3wb7n9majhmwmznvkbsxihxzsnmx9csb-glfw-3.4/include
+  -isystem
+  /nix/store/3wb7n9majhmwmznvkbsxihxzsnmx9csb-glfw-3.4/include
+  -isystem
+  /nix/store/rgc9szrr28wgx3h0wglhb9ci5qvf2b1h-readline-8.2p13-dev/include
+  -isystem
+  /nix/store/rgc9szrr28wgx3h0wglhb9ci5qvf2b1h-readline-8.2p13-dev/include
+  -isystem
+  /nix/store/jd82fkkcyi48pna0q2hjf0x929lsp6gb-llvm-18.1.8-dev/include
+  -isystem
+  /nix/store/jd82fkkcyi48pna0q2hjf0x929lsp6gb-llvm-18.1.8-dev/include
+  -isystem
+  /nix/store/69v6c64pn1ay26207b0cmzi40qpr9q0w-ncurses-6.4.20221231-dev/include
+  -isystem
+  /nix/store/69v6c64pn1ay26207b0cmzi40qpr9q0w-ncurses-6.4.20221231-dev/include
+  -isystem
+  /nix/store/06q0p7bhn2ffxxya20rrfqdib3h32csn-zlib-1.3.1-dev/include
+  -isystem
+  /nix/store/06q0p7bhn2ffxxya20rrfqdib3h32csn-zlib-1.3.1-dev/include
+  -isystem
+  /nix/store/zps3l0mc26r7bvjqd8x0y1lbc6gmbdvn-gnumake-4.4.1/include
+  -isystem
+  /nix/store/zps3l0mc26r7bvjqd8x0y1lbc6gmbdvn-gnumake-4.4.1/include
+  -isystem
+  /nix/store/kjgslpdqchx1sm7a5h9xibi5rrqcqfnl-python3-3.12.8/include
+  -isystem
+  /nix/store/kjgslpdqchx1sm7a5h9xibi5rrqcqfnl-python3-3.12.8/include
+  -isystem
+  /nix/store/jii2qmkiwlynzkxyq3ly0cqzv4pj46ng-gdb-15.2/include
+  -isystem
+  /nix/store/jii2qmkiwlynzkxyq3ly0cqzv4pj46ng-gdb-15.2/include
+  -isystem
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