How to get time before launching a command each time in terminal?

Question

I would like that each time I run a command in terminal I have the time displayed in my term then the command executed.

Answer 1

You can just run

 PROMPT_COMMAND="date"

on your terminal then every time a command is ran on your terminal the current date and time will be printed out on your terminal. As suggested by@pa4080, to make it permanent, add PROMPT_COMMAND="date" to your ~/.bashrc file.

From man bash:

PROMPT_COMMAND

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

I think you can use the same command PROMPT_COMMAND= to run almost "anything" you want to run when a command is ran on the terminal.

If you use tmux, it also display time on the corner:

Answer 2

Assuming you're running Bash, you can set PROMPT_COMMAND to a command that is executed when the prompt is printed out. Similarly, you could run an arbitrary command by including a command substitution in the prompt:

$ PS1='[$(date +"%T")] \u@\h \w\$ '
[22:17:54] user@somehost /tmp$ 

But this is common enough that Bash supports it off the shelf

\D{format}
The format is passed to strftime(3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation. The braces are required.

So, similarly to the previous

$ PS1='[\D{%T}] \u@\h \w\$ '

---

But those print the time the prompt was printed. This may be quite a while before the next command is executed. To get the time the command is started, we can use the DEBUG trap, which runs once for each command line executed.

$ starttime() { date +"Command started at %T"; }
$ trap starttime DEBUG
$ ls -l /dev/null
Command started at 22:25:07
crw-rw-rw- 1 root root 1, 3 Jul 18 21:46 /dev/null

The DEBUG trap could also use the $BASH_COMMAND variable which contains the command being executed, but that's probably not very useful since the command line is visible at the prompt anyway.

Answer 3

use zsh terminal, this terminal can show date time run command

https://github.com/robbyrussell/oh-my-zsh/wiki/themes#rkj-repos https://github.com/robbyrussell/oh-my-zsh/wiki/themes#xiong-chiamiov

Answer 4

1. Edit .bashrc file

   gedit ~/.bashrc
   

2. Find the following text:

   if [ "$color_prompt" = yes ]; then
   PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\] :\[\033[01;34m\]\w\[\033[00m\]\$ ' 
   

3. And replace with:

   if [ "$color_prompt" = yes ]; then
   PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u\[\033[00m\] [\d|\t]:\[\033[01;34m\]\w\[\033[00m\]\$ ' 
   

4. Restart terminal to check.