Clean file only if is not used by other processes

Asked Jun 05 '19 at 07:02

Active Jun 05 '19 at 07:35

Viewed 40 times

I need to clean a file every x hours in order to clean RAM usage. With BusyBox v1.23.2

So I can do this:

cat /dev/null > myfile.txt

This works correctly. But, there are other processes that read this file and perform other actions, so how can I clean the file, and be sure that no other processes are reading/writing myfile.txt?

Pseudo code:

if(file_not_used()) ==> cat /dev/null > myfile.txt

I would like to do this with a bash script scheduled with crontabs.

edited Jun 05 '19 at 07:35

asked Jun 05 '19 at 07:02

DDBE

2

Take a look at https://linux.die.net/man/8/lsof – oguz ismail Jun 05 '19 at 07:08
Better than `lsof` is `fuser` -- identify processes using files or sockets. More info on `man fuser` – kvantour Jun 05 '19 at 07:12
I forgot to say that I'm using BusyBox v1.23.2, so I don't have lsof or fuser – DDBE Jun 05 '19 at 07:36
@DDBE seems like `fuser` is part of it https://busybox.net/downloads/BusyBox.html – kvantour Jun 05 '19 at 08:59
@kvantour Thanks, I need to add it to the building process! – DDBE Jun 05 '19 at 09:04

Clean file only if is not used by other processes

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