Aria automatic downloader script

!ZeScript.sh

#!/bin/bash

# root@omv:/export/Medias/!Dépot/Aria# ls -la
# total 16
# drwxrwsr-x  2 nobody users 4096 Aug 21 22:26 .
# -rw-r-----  1 root   users 3258 Aug 21 22:25 !Archives.txt
# -rwxr-xr--  1 root   users 1.1K May 29 18:38 !IDN-Convert.py
# -rw-rw-r--  1 alex   users    0 Aug 21 22:25 !ToDL.txt
# -rwxr-xr--  1 root   users 1223 Aug 21 22:22 !ZeScript.sh

# SU owned, rw, r
archives='!Archives.txt'
lock='!Aria.lock'
# User owned, rw, rw, r
todl='!ToDL.txt'
idn_convert='python3 !IDN-Convert.py'

sepline=--------------------------------------------------------------------------------
wecho() {
  echo $*$'\r'
}

# Entering working directory
pushd `dirname "$0"` >/dev/null

wecho >> "$todl"
sed -i '/^\s*$/d' "$todl"

# Do we have something to download ?
if [ -e "$lock" ]; then
  echo 'Lock present, skipping.'
elif [ -s "$todl" ]; then
  # Create lock file
  touch "$lock"

  # Add new list to download list & empty new list
  wecho "# New content at $(date +'%F %T %z')" >> "$archives"
  wecho "# $sepline"                           >> "$archives"
  # UTF-8 ou pas ?
  if iconv -f utf8 $todl >/dev/null 2>&1; then
    cat "$todl" | $idn_convert >> "$archives"
  else
    iconv -f cp1252 -t utf8 "$todl" | $idn_convert >> "$archives"
  fi
  wecho "# $sepline" >> "$archives"
  # Sanity check
  chmod 640 "$archives"
  chmod 664 "$todl"
  # Empty ToDL file
  :>"$todl"

  # Download (extract download result)
  #umask 0002
  wecho "# Results"  >> "$archives"
  wecho "# $sepline" >> "$archives"
  
  sudo -u 'nobody' -g 'users' -- sh -c "umask 0002; aria2c -j3 -U 'aria2/$VERSION - Alex' --summary-interval=0 --auto-file-renaming=false --seed-time=0 --input-file=$archives" | \
    sed -n '/Results/,/Legend/p' | head -n -2 | tail -n +2 | sed 's/^/# /;s/$/\r/' | tee -a "$archives"
  
  wecho "# $sepline" >> "$archives"
  wecho "#"          >> "$archives"
  wecho "#"          >> "$archives"
  
  # Comment out downloaded content
  sed -i '/^[^#]/ s/^/#/' "$archives"

  # Remove lock
  rm -f "$lock"
else
  echo 'Nothing to do.'
fi

# Leaving directory
popd >/dev/null

# Done