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83 lines
2.1 KiB
Markdown
83 lines
2.1 KiB
Markdown
# Custom Commands
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Optimize repetitive terminal tasks. Custom commands, or aliases, create shortcuts for long or frequently used commands.
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### Creating an Alias
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Consider a common scenario: checking web server connections with a lengthy `netstat` command:
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```bash
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netstat -plant | grep '80\|443' | grep -v LISTEN | wc -l
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```
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Typing this repeatedly is inefficient. Create an alias as a shortcut. For example, let `conn` execute this command.
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```bash
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alias conn="netstat -plant | grep '80\|443' | grep -v LISTEN | wc -l"
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```
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Now, simply type `conn`:
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```bash
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conn
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```
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You'll get the same output.
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Enhance it with an informative message:
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```bash
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alias conn="echo 'Total connections on port 80 and 443:' ; netstat -plant | grep '80\|443' | grep -v LISTEN | wc -l"
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```
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Running `conn` will now yield:
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```
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Total connections on port 80 and 443:
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12
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```
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Note: Aliases created this way are temporary. They disappear when your terminal session ends.
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### Making Aliases Permanent
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Aliases are session-bound by default. To make them permanent, add them to your shell's profile file. For Bash, this is typically `~/.bashrc`.
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Open `~/.bashrc` (or create it if it doesn't exist):
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```bash
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nano ~/.bashrc
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```
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Add your alias to the end of the file:
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```bash
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alias conn="echo 'Total connections on port 80 and 443:' ; netstat -plant | grep '80\|443' | grep -v LISTEN | wc -l"
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```
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Save and exit.
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Apply changes without restarting your terminal:
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```bash
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source ~/.bashrc
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```
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Now, your custom command `conn` will be available in all new and sourced terminal sessions.
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### Listing Aliases
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To view all active aliases in your current shell, simply run:
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```bash
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alias
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```
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This helps in troubleshooting command behavior.
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### Conclusion
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Aliases are powerful tools for optimizing your terminal workflow, offering quick command shortcuts. While full Bash scripts offer more complexity, aliases provide an immediate, user-level solution without requiring root access for installation.
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> {notice} This content was inspired by a piece by softwareshinobi on Dev Team Six.
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