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--- computers:tricksandtips [2023/10/19 10:04] – [Working] david
+++ computers:tricksandtips [2026/01/15 15:30] (current) – [Directory Sync with Unison] david
@@ Line 194: / Line 194: @@
 user    0m29.380s
 sys     33m49.240s
+</code>
+==== Using tar Compress ====
+=== Specific File Types ===
+<code>
+find /path/to/directory -type f -name "*.extension" -print0 | tar -cvf archive_name.tar --null -T -
+</code>
+Add compression
+<code>
+find /path/to/directory -type f -name "*.txt" -print0 | tar -cv --null -T - | pigz --best > archive_name.tar.gz
 </code>
 ====== BIOS Upgrade ======
@@ Line 327: / Line 342: @@
 ====== Networking ======
+===== Directory Sync with Unison =====
+  - Install on both machines<code>
+sudo apt install unison
+</code>
+  - Set up Passwordless SSH <code>
+ssh-keygen -t rsa -b 4096
+ssh-copy-id user@remote_host
+</code>
+  - Command to sync directories <code>
+unison /home/user/local_dir/ ssh://user@remote_host//home/user/remote_dir/
+</code>
+  - Creating a Sync Profile <code>
+# Root directories to sync
+root = /home/user/my_code
+root = ssh://user@remote_host//home/user/my_code
+# Automatic settings
+auto = true      # Skip prompts for non-conflicting changes
+batch = true     # Do not ask any questions at all
+times = true     # Preserve modification times
+# Paths to ignore (supports globs)
+ignore = Name {.git,node_modules,*.tmp}
+ignore = Path build
+</code>
 ===== rsync limiting bandwidth =====
@@ Line 367: / Line 408: @@
 </code>
+copy FROM a server back to yourself
+<code>
+bash-3.2$ ssh username@server "tar czf - --strip-components=PATHDEPTH /server/source/directory" | tar xzf - -C /your/local/dest/
+</code>
+===== rsync Windoze Files =====
+You need to expand the time stamp difference for Windoze to not re-copy everything;
+<code>
+# always have vP for verbose and progress
+rsync --modify-window=5 -vPrltD NORMAL THING
+# NO LUCK for me like this, but adding this does only check file size
+rsync --size-only -vaP FROM/ TO/
+# try this
+rsync --size-only -vPrltD # OR remove -t
+# doing this on windows backup drive:
+rsync --size-only -vPrlD
+</code>
 ===== sshd Piping =====
@@ Line 381: / Line 444: @@
 ==== Working ====
+NOTE: Verified today this works from South Africa between my servers.    --- //[[david@lattice.net|David Lloyd Rabine]] 2023/10/19 10:07//
 On the machine you want to get connected to: (-N to not get a prompt, just create the tunnel)
@@ Line 688: / Line 753: @@
 # pipe to less if you want to page up / page down have a look (and reverse to so newest at top) q to exit less
 find /pool/media/video/hd -xdev -type f -exec stat --format="%Y %n" {} \; | sort -k 1,1nr | less
+# AI suggested this for nice file formatting 2025
+# Alternative using printf for better formatting
+find /path/to/search -type f -printf '%T+ %p\n' | sort -r | head -10
 </code>
+==== Find and Copy Files Between Two Dates ====
+Use **newermt** switch to **find** and copy files that are human readable times / dates from one place to another.
+<code>
+find /Volumes/6608 -newermt "2024-11-01 00:00:00" ! -newermt "2024-12-01 00:00:00" -exec cp -a "{}" .  \;
+</code>
 ==== Sort Text File By Second Column ====
@@ Line 971: / Line 1051: @@
 After upgrading from 10.04 to 11.04, grub2 got broken.  Found the answer quickly here:  [[http://www.webupd8.org/2010/05/fix-symbol-grubputs-not-found-when.html]]
+==== Grub Boot Parameters ====
+  - mount your partition to /mnt (assuming /dev/sda5 is the drive) <code>
+sudo mount /dev/sda5 /mnt
+</code>
+  - Then mount a few more directories that are needed <code>
+sudo mount --bind /dev /mnt/dev
+sudo mount --bind /sys /mnt/sys
+sudo mount --bind /proc /mnt/proc
+</code>
+  - Also, if you have a separate Ubuntu boot partition (pretty uncommon these days, but it may be the case) <code>
+sudo mount /dev/sdaX /mnt/boot
+</code>
+  - make your /root drive /mnt <code>
+sudo chroot /mnt
+</code>
+  - make any changes to etc/default/grub <code>
+sudo nano /etc/default/grub
+</code>
+  - run update grub (already chroot, when i tried sudo it gave me some lookup error) <code>
+update-grub
+</code>
+  - exit
+  - check that /etc/grub/grub.cfg is updated (recent file time)
+  - reboot
+  - profit
 ==== KDE ====
@@ Line 1102: / Line 1209: @@
   * This one converts video to the target format (mkv here) <code>
 youtube-dl -f mkv
+</code>
+====== MacOs ======
+===== Scripting =====
+==== bash ====
+=== Files in Order ===
+Sometimes I have noticed files do not happen in order when doing command line things.  Using **xargs** and **sort** allows us to sort the input files so that the order is correct.
+<code>
+ls -v j080_202405* | sort | xargs cat > j080_overnight.jps
 </code>