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--- linux:start [2021/03/16 22:33] – [Reducing PDF size] mh
+++ linux:start [2022/05/30 22:29] – [Useful shell] mh
@@ Line 167: / Line 167: @@
   *''/screen'' lower quality, smaller size. (72 dpi)
-  *''/ebook'' for better quality, but slightly larger pdfs. (150 dpi)
+  *''/ebook'' for better quality, but slightly larger pdfs. (150 dpi) - __This one gives quite a good ratio of quality-loss/size-reduction__
   *''/prepress'' output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)
   *''/printer'' selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)
@@ Line 322: / Line 322: @@
 //Note to self : Added "mii" module to the list, the fix didn't seem to hold after reboot. Mii seems to be using r8169 and is network-monitoring-related//
+==== Fixing python on youtube-dl ====
+If following error occurs while using ''youtube-dl'' :
+<code bash>
+/usr/bin/env: ‘python’: No such file or directory
+</code>
+=== If python3 is not installed ===
+<code bash>
+$sudo apt install python3
+</code>
+=== If python3 is  installed ===
+<code bash>
+$whereis python3
+$sudo ln -s /usr/bin/python3 /usr/bin/python
+</code>
+Change first argument according to where python3 is installed.
 ===== Linux Screencast tools =====
@@ Line 479: / Line 502: @@
 <code bash>
-#All the following commands are verbose (-v)
+#All the following commands are verbose (-v) and target a file archive (-f)
-$ tar -xvf file.tar #Unpack tar
+$ tar -xvf file.tar #Unpack tar (-x : extract)
-$ tar -xvzf file.tar.gz #Unpack compressed (gzip) tar
+$ tar -xvzf file.tar.gz #Unpack compressed (gzip) tar (-z : filter through gzip)
-$ tar -cvf file.tar /path/folder #Pack folder into file.tar archive
+$ tar -cvf file.tar /path/folder #Pack folder into file.tar archive (-c : create)
-$ tar -cvzf file.tar /path/folder #Same as above with compression (gzip)
+$ tar -cvzf file.tar /path/folder #Same as above with compression (gzip) (-z : filter through gzip)
 </code>
@@ Line 489: / Line 512: @@
 ----
+=== Samba ===
+<code bash>
+sudo service smbd start/stop/restart
+</code>
+----
+===== apt and dpkg =====
+==== Fixing apt dependency problems ====
+This can fix some states in which apt is broken and refuses to update because some libraries fail :
+<code bash>
+$ dpkg --configure -a
+$ apt --fix-broken install
+</code>
@@ Line 513: / Line 554: @@
 <code bash>
 $ cat /proc/cpuinfo
+</code>
+On Macs :
+<code bash>
+$ sysctl -n machdep.cpu.brand_string
 </code>