#!/bin/bash

limit=20971520                        # 20 gygabytes
batchsize=200                         # files to remove by one circle
walpath="/var/lib/pgsql/pgLogs"  # wal archive path

# cut archive while size is greater than limit
while [ "$(du -s "${walpath}" | cut -f 1)" -gt "${limit}" ]; do
    echo Remove old WAL
    ls -lhtr ${walpath}/ | head -n ${batchsize} | awk '{print $9}' | xargs -I {} rm -v ${walpath}/{}
done