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sudo dpkg -i <DEBIAN_PACKAGE>
| Token | Description |
| DEBIAN_PACKAGE | A Debian package that normally has deb extension. |
sudo apt-get install -f
| Command | Description |
|---|---|
| postqueue -p | Display the queue |
| postcat -vq <QUEUE_ID> | View the content of the email |
| postsuper -d ALL | Remove all emails |
| postsuper -d <QUEUE_ID> | Remove a particular email |
| postqueue -i <QUEUE_ID> | Attempt to send one particular email |
| Token | Description |
| QUEUE_ID | Can be identified by displaying the queue. |
Syntax
To sync some of your local directories to another local directory, you can use the following syntax:
rsync -av -L --delete <DIR1>[[ <DIR2>] <DIRn>] <DESTINATION_DIR>
| Token | Description |
| DIR1, DIR2, DIRn | These are the local directories you've wanted to be synced. Only DIR1 is required and the rest are optional. |
| DESTINATION_DIR | The destination directory on the remote machine. |
Example
rsync -av -L --delete /var/log/ /data/log/
| Variable | Description | Possible Values |
|---|---|---|
| GIT_CURL_VERBOSE | Tells Git to emit all the messages generated by that library. This is similar to doing curl -v on the command line. | 1 |
| GIT_SSL_NO_VERIFY | Tells Git not to verify SSL certificates. | true |
| GIT_TRACE | Controls general traces | 1, 2 or true |
| GIT_TRACE_PACKET | Enables packet-level tracing for network operations. | true |
ssh-keygen -t ed25519
ssh-copy-id -i ~/.ssh/id_ed25519.pub <USER>@<HOST>
| Token | Description |
| USER | A valid user on the host computer. |
| HOST | The host that has an active ssh service. |
If ssh-copy-id command doesn't work, you can directly append the content of the id_ed25519.pub file to the ~/.ssh/authorized_keys file (i.e. create this file if it doesn't exists) of the target <USER> on the target <HOST>.
Create a new alias for postfix service by updating the following file:
/etc/aliases
Each entry in the file must have the following syntax:
<ALIAS>: <USER1>[[, <USER2>], <USERn>]
| Token | Description |
| ALIAS | The desired email alias. |
| USER1, USER2, USERn | USER1 is required and the rest are optional. Each user must be delimited by a comma.
The target user of the alias must be a valid user of the system with a home directory. |
Example:
postmaster: root
After updating the file, you must execute the following command:
sudo newaliases
compile group: 'org.apache.derby', name: 'derby', version: '10.15.1.3' compile group: 'org.apache.derby', name: 'derbyshared', version: '10.15.1.3'
requires org.apache.derby.engine; requires org.apache.derby.commons; requires java.sql;
final String DATABASE_NAME = "sample_table";
String connectionURL = String.format("jdbc:derby:%s;create=true", DATABASE_NAME);
connection = DriverManager.getConnection(connectionURL);
connection.close();
boolean gotSQLExc = false;
try {
//shutdown all databases and the Derby engine
DriverManager.getConnection("jdbc:derby:;shutdown=true");
} catch (SQLException se) {
if ( se.getSQLState().equals("XJ015") ) {
gotSQLExc = true;
}
}
if (!gotSQLExc) {
System.out.println("Database did not shut down normally");
}
A clean shutdown always throws SQL exception XJ015, which can be ignored.
Values can become a valid record source for select statement if the values has table alias and column names as follows:
SELECT dummy_table.*
FROM (VALUES ('record1'),
('record2'),
('record3'),
('record4'),
('record5'),
('record6'),
('record7'),
('record8'),
('record9')) dummy_table (column1)
From the preceding select statement, the dummy_table is the table alias and the column name is column1.
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