Add SRI notes.

2/SRI/notes/ftp-server.txt

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+apt install proftpd ftp
+id ftp
+ftpasswd --passwd --name admin --home /srv/ftp --uid 124 \
+	--shell /bin/false --file /etc/proftpd/passwd.virtual
+
+# In /etc/proftpd/proftpd.conf
+AuthUserFile /etc/proftpd/passwd.virtual
+	RequireValidShell off

2/SRI/notes/quotas.txt

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+apt install quotas
+find /lib/modules/`uname -r` -type f -name '*quota_v*.ko*'
+
+# In /etc/fstab:
+s/errors=remount-ro/usrquota,grpquota/
+s/1$/0/
+
+quotacheck -cugm /
+quotaon -ugv /
+quotaoff -ugv /
+setquota -u user block-soft block-hard inode-soft inode-hard /
+# list all quotas
+repquota -a