diff --git a/internal/pgbackrest/postgres.go b/internal/pgbackrest/postgres.go
index 2afcd508ff..c8236a3f20 100644
--- a/internal/pgbackrest/postgres.go
+++ b/internal/pgbackrest/postgres.go
@@ -28,11 +28,12 @@ func PostgreSQL(
 	// - https://pgbackrest.org/user-guide.html#quickstart/configure-archiving
 	// - https://pgbackrest.org/command.html#command-archive-push
 	// - https://www.postgresql.org/docs/current/runtime-config-wal.html
-	fixTimezone := `sed -E 's/([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\+\-][0-9]{2})/\1\2/' | sed 's/UTC/Z/'`
-	extractCommitTime := `awk '{print $(NF-2) "T" $(NF-1) " " $(NF)}' | ` + fixTimezone + ``
-	validateCommitTime := `grep -E '^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2}`
+
+	fixTimezone := `sed -E "s/([0-9]{4}-[0-9]{2}-[0-9]{2}) ([0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\\+\\-][0-9]{2})/\1T\2\3/" | sed "s/UTC/Z/"`
+	extractCommitTime := `grep -oP "COMMIT \K[^;]+" | ` + fixTimezone + ``
+	validateCommitTime := `grep -E "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})$"`
 	archive := `pgbackrest --stanza=` + DefaultStanzaName + ` archive-push "%p"`
-	archive += ` && timestamp=$(pg_waldump "%p" | grep COMMIT | ` + extractCommitTime + ` | tail -n 1 | ` + validateCommitTime + `)$');`
+	archive += ` && timestamp=$(pg_waldump "%p" | ` + extractCommitTime + ` | tail -n 1 | ` + validateCommitTime + `);`
 	archive += ` if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/latest_commit_timestamp.txt; fi`
 
 	outParameters.Mandatory.Add("archive_mode", "on")
diff --git a/internal/pgbackrest/postgres_test.go b/internal/pgbackrest/postgres_test.go
index 618b8bff4e..b518e6edd4 100644
--- a/internal/pgbackrest/postgres_test.go
+++ b/internal/pgbackrest/postgres_test.go
@@ -22,14 +22,14 @@ func TestPostgreSQLParameters(t *testing.T) {
 	assert.DeepEqual(t, parameters.Mandatory.AsMap(), map[string]string{
 		"archive_mode": "on",
 		"archive_command": strings.Join([]string{
-			`pgbackrest --stanza=db archive-push "%p"`,
-			` && timestamp=$(pg_waldump "%p" | grep COMMIT | awk '{print $(NF`,
-			`-2) "T" $(NF-1) " " $(NF)}' | sed -E 's/([0-9]{4}-[0-9]{2}-[0-9]`,
-			`{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\+\-][0-9]{2})/\`,
-			`1\2/' | sed 's/UTC/Z/' | tail -n 1 | grep -E '^[0-9]{4}-[0-9]{2}`,
-			`-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})`,
-			"$'); if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/l",
-			"atest_commit_timestamp.txt; fi",
+			`pgbackrest --stanza=db archive-push "%p" `,
+			`&& timestamp=$(pg_waldump "%p" | `,
+			`grep -oP "COMMIT \K[^;]+" | `,
+			`sed -E "s/([0-9]{4}-[0-9]{2}-[0-9]{2}) ([0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\\+\\-][0-9]{2})/\1T\2\3/" | `,
+			`sed "s/UTC/Z/" | `,
+			"tail -n 1 | ",
+			`grep -E "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})$"); `,
+			"if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/latest_commit_timestamp.txt; fi",
 		}, ""),
 		"restore_command":        `pgbackrest --stanza=db archive-get %f "%p"`,
 		"track_commit_timestamp": "true",
@@ -48,14 +48,14 @@ func TestPostgreSQLParameters(t *testing.T) {
 	assert.DeepEqual(t, parameters.Mandatory.AsMap(), map[string]string{
 		"archive_mode": "on",
 		"archive_command": strings.Join([]string{
-			`pgbackrest --stanza=db archive-push "%p"`,
-			` && timestamp=$(pg_waldump "%p" | grep COMMIT | awk '{print $(NF`,
-			`-2) "T" $(NF-1) " " $(NF)}' | sed -E 's/([0-9]{4}-[0-9]{2}-[0-9]`,
-			`{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\+\-][0-9]{2})/\`,
-			`1\2/' | sed 's/UTC/Z/' | tail -n 1 | grep -E '^[0-9]{4}-[0-9]{2}`,
-			`-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})`,
-			"$'); if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/l",
-			"atest_commit_timestamp.txt; fi",
+			`pgbackrest --stanza=db archive-push "%p" `,
+			`&& timestamp=$(pg_waldump "%p" | `,
+			`grep -oP "COMMIT \K[^;]+" | `,
+			`sed -E "s/([0-9]{4}-[0-9]{2}-[0-9]{2}) ([0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\\+\\-][0-9]{2})/\1T\2\3/" | `,
+			`sed "s/UTC/Z/" | `,
+			"tail -n 1 | ",
+			`grep -E "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})$"); `,
+			"if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/latest_commit_timestamp.txt; fi",
 		}, ""),
 		"restore_command":        `pgbackrest --stanza=db archive-get %f "%p" --repo=99`,
 		"track_commit_timestamp": "true",