Add executed commands to shell history

[llagerlof]

No description provided.

[mefengl]

related: #99

[steve8708]

should the newline come before the new command instead of after?

Suggested change

	fs.appendFile(historyFile, `${command}\n`, (err) => {
	fs.appendFile(historyFile, `\n${command}`, (err) => {

or is the idea that these files already always end in a newline (and if so are we 100% confident that this is the case all the time for all of the supported shells, or perhaps should we at least check, like

let fileContents = await readFile(historyFile)
if (!fileContents.endsWith('\n')) {
  // ensure we add the newline
}

[llagerlof]

Thanks for the suggestion, but I added a newline at the end of the string because that's a POSIX rule. All lines in text files should end with a newline character, including the last line of plain text files. We can expect a newline at the end of all history files.

However, I am not opposed to checking it first.

[steve8708]

ah i see, works for me!