[TangerineSDR] [HamSCI] Bash Scripting Help

Robert McGwier rwmcgwier at gmail.com
Sat Sep 10 11:50:04 EDT 2022

dirs=($(find /tmp/test -type d))
for dir in "${dirs[@]}"; do
  cd "$dir"
  ls -pt | grep -v / | tail -n +4 | xargs rm -f
replace /tmp/test with your directory name.

On Tue, Sep 6, 2022 at 12:12 PM Jonathan <emuman100 at gmail.com> wrote:

> Hi All,
> I need some assistance in writing a bash script that will run as a cron
> job to archive VLF data. The data is recorded in hour-long chunks as files.
> I have a cleardown script that will cleardown the oldest files and always
> maintain a rotating buffer, so as the newest file is being recorded, the
> oldest file is being deleted. What I need now is a way to locate the oldest
> file, encode it to flac using vlfrx-tools vtflac utility, then delete the
> original file. Here is an example:
> find locating the oldest files. There is often more than one and the
> naming convention is YYMMDD-HHMMSS. Running the following:
> find /data/vlf_32k -type f -mtime +50
> prints:
> /data/vlf_32k/220904-144416
> /data/vlf_32k/220904-150000
> ...
> /data/vlf_32k/220904-230000
> Next, we need to encode those files to flac to the archive directory:
> vtflac -e /data/vlf_32k/220904-144416 >
> /mnt/archive/vlf_32k_flac/220904-144416.fx
> vtflac -e /data/vlf_32k/220904-150000 >
> /mnt/archive/vlf_32k_flac/220904-150000.fx
> ...
> vtflac -e /data/vlf_32k/220904-230000 >
> /mnt/archive/vlf_32k_flac/220904-230000.fx
> Finally, delete the original files:
> rm /data/vlf_32k/220904-144416
> rm /data/vlf_32k/220904-150000
> ...
> rm /data/vlf_32k/220904-230000
> I haven't done a lot of bash scripting, so I'm asking if anyone here may
> have experience with this. I need the above commands to be executed by a
> bash script so it'll complete those commands no matter how many files that
> the find utility will find. Sometimes, there will be no files the find
> utility locates and the script should just exit. It'll be executed every
> hour by cron. Any help or assistance will be appreciated!
> Thank you!
> Jonathan
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> .

Dr. Robert W McGwier, Ph.D.
Adjunct Faculty, Virginia Tech
Affiliated Faculty, University of Scranton
ARDC Member of Board
Sky: AAVSO, Sky360, Auburn A.S., Skyscrapers
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