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--- shelltricks [2020-02-10 22:03] – angelegt fanir
+++ shelltricks [2021-08-02 14:19] (aktuell) – fanir
@@ Zeile 2: / Zeile 2: @@
 Miscellaneous small shell scripts that I may or may not need again in the far future.
 ===== Check umask for all users =====
@@ Zeile 9: / Zeile 10: @@
 for user in $(awk -F: '{print $1}' /etc/passwd); do
-    printf "%-20s" "$user" ; su -p -s /bin/bash -c 'umask' -l $user 2>/dev/null
+    printf "%-20s" "$user" ; su -s /bin/bash -c 'umask' -l $user 2>/dev/null
 done
 </code>
 Original source: https://unix.stackexchange.com/a/82645
+===== Show the dates of the oldest unseen messages in multiple maildirs, newest first =====
+Beware of weird directory names. I am not responsible if this somehow does an ''rm -rf --no-preserve-root /'' or something.
+<code bash>
+for dir in /var/vmail/domain/*/Maildir/new /var/vmail/domain/*/Maildir/.*/new; do
+    echo -e "$(stat -c %y $dir/$(ls -Art $dir | head -1))\t$dir"
+done | grep -v '/\./' | sort -rn
+</code>
+Same thing, but for the newest seen messages:
+<code bash>
+for dir in /var/vmail/domain/*/Maildir/cur /var/vmail/domain/*/Maildir/.*/cur; do
+    echo -e "$(stat -c %y $dir/$(ls -At $dir | head -1))\t$dir"
+done | grep -v '/\./' | sort -rn
+</code>
+The only differences are the folders (''cur'' vs. ''new'') and the sorting done by ''ls''.
+===== Extract IP addresses from "ip a" output by regex =====
+Might be useful for scripting, I guess.
+<code bash>
+IPRE='192\.168\.1\.|2001:1234:'
+ip a s up | grep -Eo "inet6? [^ /]+" | cut -d' ' -f2 | grep -E "$IPRE"
+</code>
+This prints:
+<code>
+.168.1.123
+:1234:5678:90ab:cdef:1234:5678:90ab
+</code>