diff --git a/src/meta_plugin.rs b/src/meta_plugin.rs
index b908315..3acbd01 100644
--- a/src/meta_plugin.rs
+++ b/src/meta_plugin.rs
@@ -14,6 +14,7 @@ pub mod basic;
 use crate::meta_plugin::program::MetaPluginProgram;
 use crate::meta_plugin::digest::{DigestSha256MetaPlugin, ReadTimeMetaPlugin, ReadRateMetaPlugin};
 use crate::meta_plugin::basic::{HostnameMetaPlugin, FullHostnameMetaPlugin};
+use crate::meta_plugin::system::{CwdMetaPlugin, UidMetaPlugin, UserMetaPlugin, GidMetaPlugin, GroupMetaPlugin, ShellMetaPlugin, ShellPidMetaPlugin, KeepPidMetaPlugin};
 
 #[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString, Enum)]
 #[strum(ascii_case_insensitive)]
diff --git a/src/meta_plugin/system.rs b/src/meta_plugin/system.rs
new file mode 100644
index 0000000..942c859
--- /dev/null
+++ b/src/meta_plugin/system.rs
@@ -0,0 +1,281 @@
+use anyhow::Result;
+use std::io;
+use std::io::Write;
+use std::env;
+use std::process;
+use uzers::{get_current_uid, get_current_gid, get_current_username, get_current_groupname, get_current_user};
+
+use crate::meta_plugin::MetaPlugin;
+
+#[derive(Debug, Clone, Default)]
+pub struct CwdMetaPlugin {
+    meta_name: String,
+}
+
+impl CwdMetaPlugin {
+    pub fn new() -> CwdMetaPlugin {
+        CwdMetaPlugin {
+            meta_name: "cwd".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for CwdMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match env::current_dir() {
+            Ok(path) => Ok(path.to_string_lossy().to_string()),
+            Err(_) => Ok("unknown".to_string()),
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct UidMetaPlugin {
+    meta_name: String,
+}
+
+impl UidMetaPlugin {
+    pub fn new() -> UidMetaPlugin {
+        UidMetaPlugin {
+            meta_name: "uid".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for UidMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        Ok(get_current_uid().to_string())
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct UserMetaPlugin {
+    meta_name: String,
+}
+
+impl UserMetaPlugin {
+    pub fn new() -> UserMetaPlugin {
+        UserMetaPlugin {
+            meta_name: "user".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for UserMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match get_current_username() {
+            Some(username) => Ok(username.to_string_lossy().to_string()),
+            None => Ok("unknown".to_string()),
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct GidMetaPlugin {
+    meta_name: String,
+}
+
+impl GidMetaPlugin {
+    pub fn new() -> GidMetaPlugin {
+        GidMetaPlugin {
+            meta_name: "gid".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for GidMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        Ok(get_current_gid().to_string())
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct GroupMetaPlugin {
+    meta_name: String,
+}
+
+impl GroupMetaPlugin {
+    pub fn new() -> GroupMetaPlugin {
+        GroupMetaPlugin {
+            meta_name: "group".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for GroupMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match get_current_groupname() {
+            Some(groupname) => Ok(groupname.to_string_lossy().to_string()),
+            None => Ok("unknown".to_string()),
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct ShellMetaPlugin {
+    meta_name: String,
+}
+
+impl ShellMetaPlugin {
+    pub fn new() -> ShellMetaPlugin {
+        ShellMetaPlugin {
+            meta_name: "shell".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for ShellMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match env::var("SHELL") {
+            Ok(shell) => Ok(shell),
+            Err(_) => {
+                match get_current_user() {
+                    Some(user) => {
+                        match user.shell().to_str() {
+                            Some(shell) => Ok(shell.to_string()),
+                            None => Ok("unknown".to_string()),
+                        }
+                    },
+                    None => Ok("unknown".to_string()),
+                }
+            }
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct ShellPidMetaPlugin {
+    meta_name: String,
+}
+
+impl ShellPidMetaPlugin {
+    pub fn new() -> ShellPidMetaPlugin {
+        ShellPidMetaPlugin {
+            meta_name: "shell_pid".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for ShellPidMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match env::var("PPID") {
+            Ok(ppid) => Ok(ppid),
+            Err(_) => Ok(process::id().to_string()),
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct KeepPidMetaPlugin {
+    meta_name: String,
+}
+
+impl KeepPidMetaPlugin {
+    pub fn new() -> KeepPidMetaPlugin {
+        KeepPidMetaPlugin {
+            meta_name: "keep_pid".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for KeepPidMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        Ok(process::id().to_string())
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}