diff --git a/bash.md b/bash.md
index c23a7b3..7c2f4c3 100644
--- a/bash.md
+++ b/bash.md
@@ -26,3 +26,13 @@ put .psqlrc in home directory
 Size of directory: `du -hcs //mnt/c/PostgreSQL/cassandra30/`
 
 list lines in file `wc file`
+
+
+General tasks
+------------------------------------------------------------------------------------------------------------
+
+wc - print line counts
+
+free - memory usage
+
+du - disk space by file
\ No newline at end of file
diff --git a/pgbadger.md b/pgbadger.md
index b339129..072610d 100644
--- a/pgbadger.md
+++ b/pgbadger.md
@@ -1 +1 @@
-"C:\PostgreSQL\perl5\perl\bin\perl.exe" "C:\PostgreSQL\pgbadger\pgbadger" "C:\PostgreSQL\data\logs\pg10\postgresql-Mon.log" -o "C:\Users\ptrowbridge\Downloads\pgb.html"
\ No newline at end of file
+"C:\PostgreSQL\perl5\perl\bin\perl.exe" "C:\PostgreSQL\pgbadger\pgbadger" -o "C:\Users\ptrowbridge\Downloads\pgb.html" "C:\PostgreSQL\data\logs\pg10\postgresql-Mon.log" "C:\PostgreSQL\data\logs\pg10\postgresql-Tue.log" "C:\PostgreSQL\data\logs\pg10\postgresql-Wed.log" "C:\PostgreSQL\data\logs\pg10\postgresql-Thu.log" "C:\PostgreSQL\data\logs\pg10\postgresql-Fri.log"
\ No newline at end of file
diff --git a/postgres.md b/postgres.md
index 4caf32c..19c05ac 100644
--- a/postgres.md
+++ b/postgres.md
@@ -1,3 +1,29 @@
 setup for single sign on with [SSPI](https://wiki.postgresql.org/wiki/Configuring_for_single_sign-on_using_SSPI_on_Windows)
 
-md5 hash is salted with username in front
\ No newline at end of file
+md5 hash is salted with username in front
+
+
+Memory
+=========================================================
+see whats in the buffer cache with pg_buffercache
+
+`CREATE EXTENSION pg_buffercache` 
+
+```
+SELECT
+	c.relname,
+	COUNT(*) AS buffers
+FROM
+	pg_class c
+INNER JOIN pg_buffercache b ON
+	b.relfilenode = c.relfilenode
+INNER JOIN pg_database d ON
+	( b.reldatabase = d.oid
+	AND d.datname = CURRENT_DATABASE())
+GROUP BY
+	c.relname
+ORDER BY
+	2 DESC
+LIMIT 100;
+```
+
diff --git a/postgres_features.md b/postgres_features.md
index 0ea1ac3..2b6ffb3 100644
--- a/postgres_features.md
+++ b/postgres_features.md
@@ -28,3 +28,9 @@ Security
 LDAP & Active Directory [blog](https://www.openscg.com/2017/07/setting-up-ldap-with-active-directory-in-postgresql/)
 
 Add SCRAM-SHA-256 support for password negotiation and storage (Michael Paquier, Heikki Linnakangas)
+
+
+Monitoring
+====================
+
+file system info - [pg_stat_kcache](https://rjuju.github.io/postgresql/2018/07/17/pg_stat_kcache-2-1-is-out.html)