Я сам не особо линуксоид) Это команда, синтаксис: vi /mnt/HD_a2/.transmission-daemon/settings.json - т.е. поидее команда и пусть к файлу.
Образцы допустимых команд посмотри вот тут, это вырезка из инструкции по установки Трансмишена:
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Updating the whitelist
In this section we would be adding your local lan IP range (A.B.C.*) to the whitelist. Assuming your NAS’s IP is 192.168.1.101, A.B.C.* would simply mean 192.168.1.* where the last group of number becomes asterix (*).
1. Go back to the command prompt
2. Type the command “vi /mnt/HD_a2/.transmission-daemon/settings.json” and hit <Enter>
3. Shift the cursor using the arrow keys to the line with “rpc-whitelist”
4. Hit the <End> key
The cursor would shift to the end of the line containing “rpc-whitelist”
5. Hit the left arrow key two times
The cursor would shift onto the ” at the end of 127.0.0.1
6. Hit the i key
The “-” at the lower left hand corner of the command prompt would change to “I”. Hitting the <Esc> key would change it back to “-”.
7. Ensure that “I” is at the lower left hand corner of the command prompt
8. Type the following “,A.B.C.*” (remember to replace it according to the instructions at the start of this section)
The entire line would read something like
“rpc-whitelist”: “127.0.0.1,192.168.1.*”,
9. Hit the <Esc> key
10. Hit the : key
The symbol at the lower left hand corner of the command prompt would change to “:”
11. Type the following “wq” and hit <Enter>
The file would be saved and you will be returned to the prompt