Merge branch 'master' into psql

pages/common/cd.md

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+# 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 -`

pages/common/mysql.md

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+# 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}}`

pages/linux/locate.md

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+# 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`

pages/osx/locate.md

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+
+# 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`