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Old 10-13-2009, 05:50 AM   #1
benmie
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Question Getting HISTTIMEFORMAT to work after logout


Hi, I've been trying to get timestamps on the history command. I found the following
export HISTTIMEFORMAT="%F %T "
- and it works ok - but after I logout and log back in the history command is back to normal.

So I did a little more searching and found this
export HISTTIMEFORMAT='%F %T - %H:%M:%S ' >> ~/.bashrc

I thought exporting to .bashrc would "save" the command - but I guess I am wrong.

My questions is what do I need to do to get timestamps on history evertime I log on?
And additional question - how/where do I set it for all users?

Thanks for helping

BenMie
 
Old 10-13-2009, 09:06 PM   #2
chrism01
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Logging out completely, not just that xterm, but completely logging out, then back in should work.
To set for all users, add to /etc/profile.
 
Old 10-13-2009, 09:33 PM   #3
Tinkster
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Or, as an alternative to modifying /etc/profile ..
Create a file local_bash_stuff_with_a_long_funny_name.sh
under /etc/profile.d, make it executable and put that kind
of customisation in there.

That should survive upgrades - which may/could overwrite your
modified /etc/profile .



Cheers,
Tink
 
Old 10-14-2009, 02:30 AM   #4
benmie
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Ok, I will try that :-D

But I am not sure how to create a .sh file and what to do with it afterwards.

I opened the bashrc file, but I could not see the HISTTIMEFORMAT line anywhere. Doesn't export save the command in the file or do I have to put it there my self?
 
Old 10-14-2009, 03:09 AM   #5
chrism01
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export creates an entry in your environment; it does not save it to a file; you might not want that.
Add the line into your .bashrc or .bash_profile.
 
Old 10-14-2009, 03:11 AM   #6
catkin
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Quote:
Originally Posted by benmie View Post
I opened the bashrc file, but I could not see the HISTTIMEFORMAT line anywhere. Doesn't export save the command in the file or do I have to put it there my self?
The effect of
Code:
export HISTTIMEFORMAT='%F %T - %H:%M:%S ' >> ~/.bashrc
is to append the output from export HISTTIMEFORMAT='%F %T - %H:%M:%S ' to ~/.bashrc. What is the output from export HISTTIMEFORMAT='%F %T - %H:%M:%S '? You can find out by running it at a command prompt; it does not output anything. So that is exactly what is appended to ~/.bashrc.

"export" is used to set an environment variable. That is a variable which will also be set in any child processes the current process starts such as when you run a new command.

Now you have tested the command export HISTTIMEFORMAT='%F %T - %H:%M:%S ' and found it does what you want you presumably want to have it run automatically when you log on. Putting it in ~/.bashrc is one way of doing so. ~/.bashrc is simply a series of commands that are run during shell initialisation. It probably contains commands that are unfamiliar to you but you could type them all in at a command prompt.

So you do need to put export HISTTIMEFORMAT='%F %T - %H:%M:%S ' in ~/.bashrc. You could do that by using an editor or`you can append it from the command line using
Code:
echo "export HISTTIMEFORMAT='%F %T - %H:%M:%S '" >> ~/.bashrc
 
Old 10-14-2009, 03:37 AM   #7
benmie
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Thanks catkin

that is just what I needed - I forgot the echo..

And thanks for the detailed explanation.. that helps understanding instead of "just" giving me the right code.

My bashrc looks like this now for the history stuff - but although I have the ignoredups - I see duplicates. Is it wrong?
# don't put duplicate lines in the history. See bash(1) for more options
export HISTCONTROL=ignoredups
# Timestamps on history commands
export HISTTIMEFORMAT='%F %T - %H:%M:%S '

At the start of the history list I have 20 entries from today, then 25 or 30 from yesterday and at the end again some from today... Why is that?

Last question (I think) can I use this
echo "export HISTTIMEFORMAT='%F %T - %H:%M:%S '" >> /etc/profile and then it affects all users?

Last edited by benmie; 10-14-2009 at 03:47 AM.
 
Old 10-14-2009, 03:49 AM   #8
benmie
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benmie;3718549]that is just what I needed - I forgot the echo..

And thanks for the detailed explanation.. that helps understanding instead of "just" giving me the right code.

My bashrc looks like this now for the history stuff - but although I have the ignoredups - I see duplicates. Is it wrong?
# don't put duplicate lines in the history. See bash(1) for more options
export HISTCONTROL=ignoredups
# Timestamps on history commands
export HISTTIMEFORMAT='%F %T - %H:%M:%S '

At the start of the history list I have 20 entries from today, then 25 or 30 from yesterday and at the end again some from today... Why is that?

Last question (I think) can I use this
Quote:
echo "export HISTTIMEFORMAT='%F %T - %H:%M:%S '" >> /etc/profile
and then it affects all users?
 
Old 10-14-2009, 02:32 PM   #9
Tinkster
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Quote:
Originally Posted by benmie View Post
At the start of the history list I have 20 entries from today, then 25 or 30 from yesterday and at the end again some from today... Why is that?
I'll hazard a guess; you had a shell open from the day before, and
it got closed after one you had opened today.

To avoid that kind of issue have a look at
http://www.linuxquestions.org/questi...83#post2974983

Quote:
Originally Posted by benmie View Post
Last question (I think) can I use this
and then it affects all users?
You could ... might as well do >>/etc/profile.d/mylongextrastuffforbash.sh
as discussed previously ;}



Cheers,
Tink

Last edited by Tinkster; 10-14-2009 at 02:38 PM. Reason: added link to old post
 
Old 10-14-2009, 03:47 PM   #10
catkin
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Quote:
Originally Posted by benmie View Post
benmie;3718549]And thanks for the detailed explanation.. that helps understanding instead of "just" giving me the right code.
Welcome. It was on the "Give a man a fishing rod ..." principle.
Quote:
Originally Posted by benmie View Post
My bashrc looks like this now for the history stuff - but although I have the ignoredups - I see duplicates. Is it wrong?
# don't put duplicate lines in the history. See bash(1) for more options
export HISTCONTROL=ignoredups
# Timestamps on history commands
export HISTTIMEFORMAT='%F %T - %H:%M:%S '
This may be a daft idea, but does the HISTCONTROL=ignoredups work if you remove the HISTTIMEFORMAT=?

For details on how the many possible bash initialisation files work (except the /etc/profile.d/* ones which may be Slackware specific ???) see the GNU Bash Reference. It is common practice to simplify this mechanism by making interactive login shells the same as interactive non-login shells by adding the following to /etc/profile, ideally in a bash-specific section
Code:
if [ -f ~/.bashrc ]; then . ~/.bashrc; fi
 
  


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