How to access gdbm via command line in terminal, crud operations via terminal, etc? : chatGpt ans

To interact with a GDBM (GNU Database Manager) database via the command line, you can use the gdbmtool utility, which is included with the GDBM package. This tool allows you to perform basic CRUD (Create, Read, Update, Delete) operations on a GDBM database directly from the terminal.

Accessing GDBM via Command Line with gdbmtool

1. Open a Terminal and Start gdbmtool:

   sh
   gdbmtool mydatabase.gdbm
   

   This will open the GDBM database named mydatabase.gdbm. If the file doesn't exist, it will be created.

2. Basic Commands in gdbmtool:

   • Insert/Create:

     sh
     store key value
     

     Example:

     sh
     store name "John Doe"
     store email "johndoe@example.com"
     

   • Fetch/Read:

     sh
     fetch key
     

     Example:

     sh
     fetch name
     

     Output:

     John Doe
     

   • Replace/Update:

     sh
     store key new_value
     

     Example:

     sh
     store email "john.doe@newdomain.com"
     

   • Delete:

     sh
     delete key
     

     Example:

     sh
     delete name
     

   • List all keys:

     sh
     firstkey
     nextkey
     

     Example:

     sh
     firstkey
     nextkey
     

   • Quit gdbmtool:

     sh
     quit
     

Example Session

Here's a complete example of a session in gdbmtool:

sh
$ gdbmtool mydatabase.gdbm

GDBM database opened.
gdbmtool> store name "John Doe"
gdbmtool> store email "johndoe@example.com"
gdbmtool> fetch name
John Doe
gdbmtool> store email "john.doe@newdomain.com"
gdbmtool> fetch email
john.doe@newdomain.com
gdbmtool> delete name
gdbmtool> fetch name
gdbm_fetch: No record found
gdbmtool> firstkey
email
gdbmtool> quit

Key Points:

• File Creation: If mydatabase.gdbm does not exist, it will be created when you start gdbmtool.
• Commands: You can perform CRUD operations directly in the terminal using the store, fetch, and delete commands.
• Key Navigation: The firstkey and nextkey commands allow you to iterate over all the keys in the database.

Additional Options

You can explore additional options and features of gdbmtool by typing help within the tool:

sh
gdbmtool> help

This will display a list of available commands and their descriptions.