Watcher script - please comment

Watcher script - please comment

[Helmut Jarausch]

Hi,

I'd like to start a "daemon" which notifies me if some file
is no longer accessed (e.g. by rsync from a remote host).

My simple minded solution is

#!/bin/zsh

while /bin/true; do
  if ! fuser -s $1; then break; fi
  sleep 5
done
notifier -1 -e5 -tREADY <<< $1


where the file in question is passed as a parameter.

Is there something builtin into ZSH which is more efficient / elegant.

Many thanks for a hint,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

Re: Watcher script - please comment

[Sebastian Stark]

Am 05.05.2010 um 13:25 schrieb Helmut Jarausch:
> I'd like to start a "daemon" which notifies me if some file
> is no longer accessed (e.g. by rsync from a remote host).

Under Linux, an elegant solution would be incron:

  http://inotify.aiken.cz/?section=incron&page=about&lang=en


Sebastian

Re: Watcher script - please comment

[Sebastian Stark]

Am 05.05.2010 um 14:14 schrieb Sebastian Stark:

> 
> Am 05.05.2010 um 13:25 schrieb Helmut Jarausch:
>> I'd like to start a "daemon" which notifies me if some file
>> is no longer accessed (e.g. by rsync from a remote host).
> 
> Under Linux, an elegant solution would be incron:
> 
>  http://inotify.aiken.cz/?section=incron&page=about&lang=en

Even better (still under linux):

Install inotify-tools and run:

  inotifywait -e close_write ~/testfile

Once ~/testfile is closed inotifywait exits.


Sebastian

Re: Watcher script - please comment

[Helmut Jarausch]

On  5 May, Sebastian Stark wrote:
> Even better (still under linux):
> 
> Install inotify-tools and run:
> 
>   inotifywait -e close_write ~/testfile
> 
> Once ~/testfile is closed inotifywait exits.
> 

Many thanks, Sebastian, for this perfect solution

Helmut.

Re: Watcher script - please comment

[Matt Wright]

I know it's dirty but I use this to check if my dotfiles git repository has new updates available. I wonder if you could adapt that.

#!/bin/zsh

# register a SIGUSR1 handler, this will let us catch a message from
# the spawned subshell below.
TRAPUSR1() {
	[[ -o zle ]] && zle -I
	echo "NOTE: A dotfiles update is available in git."
	# reset trap USR1 so we're not hogging it
	trap - USR1
}

# grab the current PID so we can signal ourselves, the &| at the end of the
# brackets cause us to disown the child so they don't print on our window.
PID=$$
(
	cd ~/.dotfiles

	# make sure we never ask for a password with this check
	export GIT_SSH="${HOME}/.dotfiles/tools/quiet-ssh.sh"

	l=$(git rev-list master | head -1)
	r=$(git ls-remote origin heads/master | awk '{print $1}')
	if [[ "${r}" != "$(git merge-base ${r} ${l} 2>/dev/null)" ]]; then
		# signal ourselves to write on the terminal
	  kill -USR1 $PID
	fi 
) 2>/dev/null &|

On May 5, 2010, at 4:25 AM, Helmut Jarausch wrote:

> Hi,
> 
> I'd like to start a "daemon" which notifies me if some file
> is no longer accessed (e.g. by rsync from a remote host).
> 
> My simple minded solution is
> 
> #!/bin/zsh
> 
> while /bin/true; do
>  if ! fuser -s $1; then break; fi
>  sleep 5
> done
> notifier -1 -e5 -tREADY <<< $1
> 
> 
> where the file in question is passed as a parameter.
> 
> Is there something builtin into ZSH which is more efficient / elegant.
> 
> Many thanks for a hint,
> Helmut.
> 
> -- 
> Helmut Jarausch
> 
> Lehrstuhl fuer Numerische Mathematik
> RWTH - Aachen University
> D 52056 Aachen, Germany