Adding a suffix at the end of each shell command

Question

Is it possible to automatically add some characters at the end of each command typed in the terminal.

For example, if I write

sudo apt-get update

the shell will execute

sudo apt-get update && notify-send Done

without me writing the && notify-send Done part.

Thanks in advance!

Not what you want but while waiting for a better solution you could use aliases. E.g. add the line alias ok='notify-send Done' to your ~.bashrc and then write your command like this: sudo apt-get update && ok - That also saves some typing and you can control whether you need a notification or not. — Byte Commander, Jul 09 '15 at 17:38
@ByteCommander Well yeah, I'll do that until I find better solution. Thanks! — ioanD, Jul 09 '15 at 17:39
@SylvainPineau I like to be able to customise the output, so alert doesn't work for me — ioanD, Jul 09 '15 at 17:41
It's vague to me..is the part after && (including) always going to change? Can it be empty? What about the first command ? Do you just want to type the first part or a shortcut of second part? Will the first command be changed? — heemayl, Jul 09 '15 at 18:07
@heemayl The first part will vary. The second part will always be the same. The idea is that I want the command prompt to put the second part after EVERY command i put in. — ioanD, Jul 09 '15 at 18:47

score 6 · Accepted Answer · answered Jul 09 '15 at 18:03

6

If you're using bash as your default shell, you can set PROMPT_COMMAND.

From the bash man page:

PROMPT_COMMAND
If set, the value is executed as a command prior to issuing each primary prompt.

So just paste the following line in your .bashrc to get a notification for each command:

PROMPT_COMMAND="notify-send Done"

So each time your bash prompt is called (normal behavior when a command is finished, with success or not), you'll get a notification.

Note: you'll be also notified if you press just Enter as the prompt will be displayed again.

answered Jul 09 '15 at 18:03

Sylvain Pineau

1

For the after case, trap "notify-send Done" DEBUG might be more appropriate. – muru Jul 09 '15 at 18:05
@muru thanks for the suggestion but tested with sleep 3, the notification does not wait 3s. – Sylvain Pineau Jul 09 '15 at 18:24

Nykakin · Answer 2 · 2015-07-10T15:52:09.173

0

You can bind some characters to to an enter key:

$ bind '"\C-M":" && echo test\n"'

This has some drawbacks, for example if you just press Enter:

-bash: syntax error near unexpected token `&&'

You can block this effect by terminating your lines with # character - it will turn appended text into a harmless comment.

Still I'd say that this sounds like a really bad idea.

edited Jul 10 '15 at 15:52

answered Jul 10 '15 at 15:46

Nykakin

I wanted to play around with this, but so far I haven't found the syntax to unset it after I'm done. I was thinking there must be some placeholder like : which would get rid of the syntax error. Still, it begs the question as to why anyone would want to do this for every command. Something more focused/selective would probably be a lot more useful. – Joe Jul 16 '15 at 00:37
@Joe, use bind '"\C-M":"\n"' # to unset this. The trailing hash in the command makes the appended text a comment thus disabling its effect, just as I wrote in the answer. – Nykakin Jul 16 '15 at 07:16

2 Answers2