Emacs

• tramp#File name syntax

Remote file names have method, user and host parts prepended. All of them, and also the local file name part, are optional, in case of a missing part a default value is assumed. The default value for an empty local file name part is the remote user’s home directory.

• The method part describes the connection method used to reach the remote host
• The user part is the username for accessing the remote host
• The host part must be a hostname which can be resolved on your local host

• tramp#Quick Start Guide

The simplest remote file name is /ssh:user@host:/path/to/file.

The Host keyword inside an SSH config file can be used to open a remote connection like so /ssh:framboise:/path/to/file

• tramp#Quick Start Guide

Sometimes, it is necessary to work on your local host under different permissions. For this, you can use the su or sudo connection method. On OpenBSD systems, the doas connection method offers the same functionality. These methods use root as default user name and the return value of (system-name) as default host name.

Therefore, it is convenient to open a file as /sudo::/path/to/file.

/sudo::/path/to/file is an abbreviation (by assuming default values) for /sudo:root@localhost:/path/to/file

• tramp#Quick Start Guide

If the su, sudo or doas option should be performed on another host, it can be combined with a leading ssh or plink option. That means that TRAMP connects first to the other host with non-administrative credentials, and changes to administrative credentials on that host afterwards.

In a simple case, the syntax looks like /ssh:alan@remote|sudo::/path/to/file.