diff --git a/.gitignore b/.gitignore
index d462f6c..03642a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.swp
 *.map
 install.sh
-.zcompdump
\ No newline at end of file
+.zcompdump
+.zsh_history
\ No newline at end of file
diff --git a/nix/env.nix b/nix/env.nix
index acaf41a..c52b566 100644
--- a/nix/env.nix
+++ b/nix/env.nix
@@ -29,5 +29,6 @@ pkgs.mkShell {
 		export ZDOTDIR=$PWD/nix/zsh
 		export XDG_CONFIG_HOME=$PWD/nix
 		export PATH=$PWD:$PATH
+		export SOURCE_DIR=$(./shx sourceDir)
 	'';
 }
\ No newline at end of file
diff --git a/nix/zsh/.zshrc b/nix/zsh/.zshrc
index aacfa79..4d8c30c 100644
--- a/nix/zsh/.zshrc
+++ b/nix/zsh/.zshrc
@@ -7,7 +7,7 @@ bindkey -e
 # Keep 1000 lines of history within the shell and save it to ~/.zsh_history:
 HISTSIZE=1000
 SAVEHIST=1000
-HISTFILE=~/.zsh_history
+HISTFILE=$SOURCE_DIR/.zsh_history
 # Use modern completion system
 autoload -Uz compinit
 compinit
diff --git a/sh/sh.sh b/sh/sh.sh
index 49e302a..4d121c8 100644
--- a/sh/sh.sh
+++ b/sh/sh.sh
@@ -6,7 +6,8 @@ if [ -e "$(which nix-shell)" ]; then
 		echo "Preparing Nix shell with: ${useNix}.nix..."
 		nix-shell nix/${useNix}.nix --quiet --pure --command zsh
 		echo "Quitting Nix shell..."
-		rm nix/zsh/.zcompdump
+		rm nix/.zcompdump 2> /dev/null
+		rm nix/zsh/.zcompdump 2> /dev/null
 	else
 		echo "${useNix}.nix does not exist."
 	fi
diff --git a/sh/sourceDir.sh b/sh/sourceDir.sh
new file mode 100644
index 0000000..6a183b0
--- /dev/null
+++ b/sh/sourceDir.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+# This script is to display the project directory.
+# It is solely used to support shell history isolation.
+echo $SOURCE_DIR
+exit
\ No newline at end of file