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Full Discussion: How do I know the file is arrived?
Top Forums Shell Programming and Scripting How do I know the file is arrived? Post 302482299 by rbatte1 on Tuesday 21st of December 2010 07:56:08 AM
Old 12-21-2010
If the file is quite small, then you probably won't have to worry about a follow up file to flag completion, so using the -f flag for a test should suffice:-
Code:
while [ ! -f $file ]
do
   echo "`date`: File has not arrived"
   sleep 5
done

If the file is larger, you need to confirm that the whole file has arrived, consider using the fuser command to look at what has the file open:-
Code:
while [ ! -f $file ]
do
   echo "`date`: File has not arrived"
   sleep 5
done
while [ `fuser $file 2>/dev/null | wc -c` -gt 0 ]
do
   echo "`date`: File is arriving"
   sleep 5
done
echo "`date`: File has arrived.  Processing will continue."

The condition for the while loop ask for the processes accessing the file. The standard error is usually the file name, so this is ditched to /dev/null. We then count the bytes returned, so if there is anything there, a process has the file open. If it is zero, then there are no processes working on the file.



I hope that this helps, but please write back if I have missed the point.


Another thought:-
If fuser fails, because of too many processes in total on the machine (we have this problem) there is an open source tool called lsof that can still run. Command required would be:
Code:
lsof +ff $file
... which gives no output at all for a closed file, so you get the answer zero for a closed file or not-zero for an open file.


Robin
Liverpool/Blackburn
UK
Last edited by rbatte1; 12-21-2010 at 09:06 AM.. Reason: Another thought
 

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LEARN ABOUT OSX

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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