Useful shell commands on my Synology NAS

I’m gathering some useful commands that I’m using over SSH on my Synology NAS. Most are just for myself to remember what I’ve done but others might find them useful too.

rsync

This is the snippet I’m using for copying files to my NAS.

$ rsync -a \
  --info=progress2 \
  --rsync-path=/volume1/@appstore/synocli-net/bin/rsync \
  --no-inc-recursive \
  <src> <dest>

--remove-source-files is useful if I want to move files (it removes files from source after completion).

find

find . -empty -type d -delete

find . -type f -size +4G finds all files that are bigger than 4GB.

find . -iname \*.csv -size +30M -print0 | xargs -P 3 -n 4 -0 bzip2 -9

progress display

In general the command pv is really useful here. This is quite specific against the status of Elodie.

C=0
while true; do
  NEW=`jq ' . | length' /volume1/pictures/location.json `
  if [ $NEW -gt $C ]; then
    C=$NEW
    echo -en "\r $NEW  "
    printf " %'d" `jq '.|length' /volume2/Media/tmp/hash.json `
  fi
  sleep 2
done