2total entries in unix
Redirecting streams to the /dev/null sink
Syntax
| <operation> [n]> /dev/null [options] |
| Option | Description |
|---|---|
| operation | The operation whose output will be redirected. |
| n | The stream to be redirected (see below). |
| options | The stream redirection options. |
Valid values for [n]: 1, standard out 2, standard error &, both
Using the bang command (!)
Syntax
| !<option>[:p] |
| Option | Description |
|---|---|
| ! | Use the last command |
| [n] | Use the n-th unique command in the history |
| -[n] | Use the command n-th lines back in the history (can be repeated commands) |
| [str] | Use the most recent command that starts with the given string |
| ?[str] | Use the most recent command that contains the given string |
| :0 | Use the previous command with no arguments |
| ^ | Use the first word of the previous command |
| :[n] | Use the n-th word of the previous command |
| $ | Use the last word of the previous command |
| * | Use the all words of the previous command |
| :p | Prints the matching command without executing it |