Wrapper scripts to various mail transfer agents added to .utils collection.

.templates/bin/maintenance_daily

@@ -7,6 +7,11 @@
 # Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
 #         Kovács Zoltán <kovacsz@marcusconsulting.hu>
 # License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
+# 2026-05-01 v1.1
+# new: dnf support has been added for Oracle/RHEL compatibility.
+# mod: the egrep calls have been replaced by grep -E command
+#      for better POSIX compatibility.
+# fix: 'which zpool 2>/dev/null' to omit unnecessary warnings.
 # 2023-06-18 v1.0
 # new: forked from the "SMARTERP_skeleton" repository.
 # mod: "instance" => "service"
@@ -55,7 +60,7 @@ if [ -n "$CRON" ]; then
     # Ubuntu gets the initial environment from a separate file.
     if [ -r "/etc/environment" ]; then
         # Extracts from this file, strips the right part w/o quotes.
-        includepath=$(cat "/etc/environment" | $(which egrep) '^PATH=')
+        includepath=$(cat "/etc/environment" | $(which grep) -E '^PATH=')
         includepath=${includepath:5}
         includepath="${includepath%\"}"; includepath="${includepath#\"}"
         [[ -n "$includepath" ]] && PATH="$PATH:$includepath"
@@ -71,7 +76,7 @@ if ! [[ "$PATH" =~ '/sbin:' ]]; then PATH="$PATH:/usr/local/sbin:/usr/sbin:/sbin
 #
 TR=$(which tr 2>/dev/null)
 if [ -z "$TR" ]; then echo "$MSG_MISSINGDEP tr."; exit 1 ; fi
-for item in basename cut df egrep head mail printf sleep
+for item in basename cut df grep head mail printf sleep
 do
     if [ -n "$(which $item)" ]
     then export $(echo $item | "$TR" '[:lower:]' '[:upper:]')=$(which $item)
@@ -92,12 +97,14 @@ if [ -x "$MAIL" ]; then
     [[ -x "/etc/update-motd.d/00-header" ]] \
     && message+="$("/etc/update-motd.d/00-header")\n\n"
     message+="$("$DF" -h | "$HEAD" -n1)\n"
-    message+="$("$DF" -h | "$EGREP" '^/dev/' | "$EGREP" -v 'loop')\n"
+    message+="$("$DF" -h | "$GREP" -E '^/dev/' | "$GREP" -E -v 'loop')\n"
-    if [ -n "$(which zpool)" -a -x "$(which zpool)" ]; then
+    if [ -n "$(which zpool 2>/dev/null)" -a -x "$(which zpool 2>/dev/null)" ]; then
 	# Includes ZFS partitions (if any).
 	for pool in $("$(which zpool)" list -H | "$CUT" -f1) "" #"
-	do [[ -n "$pool" ]] && message+="$("$DF" -h | "$EGREP" "^$pool/")\n"; done
+	do [[ -n "$pool" ]] && message+="$("$DF" -h | "$GREP" -E "^$pool/")\n"; done
     fi
+    [[ -x "/bin/dnf" ]] \
+    && message+="\n$("/bin/dnf" updateinfo summary)\n"
     [[ -x "/etc/update-motd.d/90-updates-available" ]] \
     && message+="$("/etc/update-motd.d/90-updates-available")\n"
     [[ -x "/etc/update-motd.d/98-fsck-at-reboot" ]] \
@@ -105,7 +112,7 @@ if [ -x "$MAIL" ]; then
     [[ -x "/etc/update-motd.d/99-reboot-required" ]] \
     && message+="$("/etc/update-motd.d/99-reboot-required")\n"
     message+="\nBest regards: the Maintenance Bot"
-    echo -e "$message" | "$MAIL" -s  "$subject" "$USER"
+    echo -e "$message" | "$MAIL" -s "$subject" "$USER"
 fi
 # Done with mail.
 

.utils/mail/README.md

@@ -0,0 +1,3 @@
+# Wrapper scripts to various mail transfer agents.
+Only needed if your system does not provide the POSIX mailx compatible mail command. If sending email is prohibited from your environment use *mail.dummy* to avoid warnings from cron, etc.
+To activate, choose a suitable one then place it somewhere in the path (~/bin or /usr/local/bin are recommended), name it mail and give it execute permission.

.utils/mail/mail.dummy

@@ -0,0 +1,3 @@
+#!/bin/bash
+#
+# Dummy file to met the dependencies. Does nothing.

.utils/mail/mail.s-nail

@@ -0,0 +1,38 @@
+#!/bin/bash
+#
+# A simple wrapper script to s-nail. Needs a suitable smarthost.
+# A copy of sent mail is saved in the /var/mail/$USER mbox file.
+# It is recommended to rotate these files e.g via /etc/logrotate.d.
+# See also https://manpages.ubuntu.com/manpages/focal/man1/s-nail.1.html
+
+# SMTP settings - feel free to adjust.
+#
+# Sender's address is fixed - pay attention to the SPF DNS record!
+FROM="no-reply@example.com"
+# Default recipient(s), delimited by space.
+TO="sysadmin@example.com webadmin@example.com"
+SMTP_SERVER="mail.example.com"
+# smtp (for tcp/25), smtps (for tcp/465), submission (for tcp/587).
+SMTP_PROTO="submission"
+# URL escaping required for special characters below.
+SMTP_USER="no-reply%40example.com"
+SMTP_PASS="topsecret"
+
+# s-nail call.
+#
+if [ -x "$(which s-nail 2>/dev/null)" ]; then
+    # The recipient's address is the last argument.
+    recipient="${@: -1}"
+    set -- "${@: 1: $#-1}"
+    # Our scripts may send mails to the local user.
+    # In this case, we need replace the recipient address.
+    [[ "$recipient" = "$USER" ]] && recipient="$TO"
+    [[ "$recipient" = "$USER@$HOSTNAME" ]] && recipient="$TO"
+    if [ -n "$recipient" ]; then
+    "$(which s-nail)" -S from="$FROM" -S v15-compat \
+	              -S smtp-auth="login" -S smtp-use-starttls \
+	              -S mta="$SMTP_PROTO://$SMTP_USER:$SMTP_PASS@$SMTP_SERVER" \
+	              -S record="/var/mail/$USER" \
+	              "${@}" $recipient
+    fi
+fi