First run attempt using this configuration

.gitignore

@@ -0,0 +1,2 @@
+
+.venv/

Makefile

@@ -0,0 +1,16 @@
+all: run
+
+run:
+	./rec.sh
+
+install:
+	sudo cp ./src/rec.sh /usr/local/bin/rec.sh
+	sudo cp ./conf/nbmrec.service /etc/systemd/system/nbmrec.service
+	sudo cp ./conf/nbmrec.timer /etc/systemd/system/nbmrec.timer
+	sudo systemctl daemon-reload
+	sudo systemctl enable nbmrec.timer
+
+uninstall:
+	sudo rm -rf /usr/local/bin/rec.sh
+	sudo rm -rf /etc/systemd/system/nbmrec.service /etc/systemd/system/nbmrec.timer
+	sudo systemctl daemon-reload

README.md

@@ -1,3 +1,9 @@
 # NBMrec
 
-Daemon recorder for nocturnal bird migration
+Daemon recorder for nocturnal bird migration
+
+## Reference
+
+- [audio recording using python](https://realpython.com/playing-and-recording-sound-python/)
+
+- [audio recording from command line](https://superuser.com/questions/1570333/how-can-i-record-audio-output-from-command-line-in-linux)

conf/nbmrec.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=NBMrec daemon nocturnal bird migration service
+
+[Service]
+Type=oneshot
+User=1000
+ExecStart=/usr/local/bin/nmbrec.sh -d night
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

conf/nbmrec.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Record bird migration every night
+
+[Timer]
+OnCalendar=*-*-* 22:00
+Unit=nbmrec.service
+
+[Install]
+WantedBy=basic.target
+

src/rec.sh

@@ -8,26 +8,64 @@ RECORD_DIR="/mnt/DATA/media/records"
 RECORD_DATE=$(date +"%Y-%m-%d")
 RECORD_FILENAME=$(date +"%Y%m%d_%H%M%S")
 RECORD_FILEPATH="${RECORD_DIR}/${RECORD_DATE}/${RECORD_FILENAME}.wav" 
-RECORD_DURATION=$1
+RECORD_DURATION=60
+
+usage() {
+    echo "Usage: $0 [ -d <duration> ] [ -f <filename> ]"
+    echo "  -d <duration> : duration of the recording in seconds or 'night' for all night recording"
+    echo "  -f <filename> : filename of the recording"
+    echo "  -h            : display this help"
+    echo "  -v            : switch to verbose mode"
+}
+
+# Get command line options
+while getopts ":hd:f:" opt; do
+  case $opt in
+    h) 
+      usage
+      ;;
+    d)
+      RECORD_DURATION=$OPTARG
+      if [ "$RECORD_DURATION" == "night" ]; then
+        RECORD_DURATION=32400
+      fi
+      ;;
+    f)
+      RECORD_FILEPATH=$OPTARG
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      exit 1
+      ;;
+    :)
+      echo "Option -$OPTARG requires an argument." >&2
+      exit 1
+      ;;
+  esac
+done
 
 verbose=false
 
-# Create output folder
+main() {
-if $verbose
+    # Create output folder
-then
+    if $verbose
-    echo "Creating record output folder"
+    then
-fi
+        echo "Creating record output folder"
-mkdir -p "$RECORD_DIR/$RECORD_DATE/"
+    fi
+    mkdir -p "$RECORD_DIR/$RECORD_DATE/"
 
-# Perform recording
+    # Perform recording
-if $verbose
+    if $verbose
-then
+    then
-    echo "Recording $RECORD_FILENAME"
+        echo "Recording $RECORD_FILENAME"
-fi
+    fi
-rec -b 16 -r 48000 -c 1 -t wav $RECORD_FILEPATH trim 0 $RECORD_DURATION
+    rec -b 16 -r 48000 -c 1 -t wav $RECORD_FILEPATH trim 0 $RECORD_DURATION
 
-if $verbose
+    if $verbose
-then
+    then
-    echo "Done"
+        echo "Done"
-fi
+    fi
-exit 0
+}
+
+main
+exit 0