diff --git a/pages/common/cd.md b/pages/common/cd.md
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--- /dev/null
+++ b/pages/common/cd.md
@@ -0,0 +1,19 @@
+# cd
+
+> Change the current working directory
+
+- Go to the given directory
+
+`cd {{/path/to/directoryl}}`
+
+- Go to home directory of current user
+
+`cd`
+
+- Go up to the parent of the current directory
+
+`cd ..`
+
+- Go to the previously chosen directory
+
+`cd -`
\ No newline at end of file
diff --git a/pages/common/mysql.md b/pages/common/mysql.md
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+++ b/pages/common/mysql.md
@@ -0,0 +1,15 @@
+# mysql
+
+> the MySQL command-line tool 
+
+- Connect to a database
+
+`mysql {{database_name}}`
+
+- Connect to a database using credentials
+
+`mysql -u {{user}} -p{{password}} {{database_name}}`
+
+- Execute SQL statements in a script file (batch file)
+
+`mysql {{database_name}} < {{script.sql}}`
diff --git a/pages/linux/locate.md b/pages/linux/locate.md
new file mode 100644
index 000000000..b5da37878
--- /dev/null
+++ b/pages/linux/locate.md
@@ -0,0 +1,11 @@
+# locate
+
+> find filenames quickly
+
+- Look for pattern in the database. Note: the database is recomputed periodically (usually weekly or daily).
+
+`locate {{pattern}}`
+
+- Recompute the database. You need to do it if you want to find recently added files.
+
+`sudo updatedb`
\ No newline at end of file
diff --git a/pages/osx/locate.md b/pages/osx/locate.md
new file mode 100644
index 000000000..52e8dc070
--- /dev/null
+++ b/pages/osx/locate.md
@@ -0,0 +1,12 @@
+
+# locate
+
+> find filenames quickly
+
+- Look for pattern in the database. Note: the database is recomputed periodically (usually weekly or daily).
+
+`locate {{pattern}}`
+
+- Recompute the database. You need to do it if you want to find recently added files.
+
+`sudo /usr/libexec/locate.updatedb`
\ No newline at end of file