updated emacs, ffmpeg. branched org-mode. added slack.

cheat/cheatsheets/deb

@@ -0,0 +1,3 @@
+# Extract contents of a .deb file
+$ ar vx foo.deb    # -> data.tar.gz
+$ tar xf data.tar.gz

cheat/cheatsheets/emacs

@@ -3,7 +3,7 @@
   Indent              Select text then press TAB
   Cut                 CTRL-w
   Copy                ALT-w
-  Paste               CTRL-y
+  Paste ("yank")      CTRL-y
   Search/Find         CTRL-s
   Replace             ALT-% (ALT-SHIFT-5)
   Save                CTRL-x CTRL-s
@@ -11,7 +11,7 @@
   Undo                CTRL-x u
   Highlight all text  CTRL-x h
   Directory listing   CTRL-x d
-  Cancel a command    ESC ESC ESC
+  Cancel a command    CTRL-g
   Font size bigger    CTRL-x CTRL-+
   Font size smaller   CTRL-x CTRL--
 
@@ -30,7 +30,7 @@
 
 # Other stuff
 
-  Open a shell         ALT-x eshell
+  Open a shell         ALT-x shell
   Goto a line number   ALT-x goto-line
   Word wrap            ALT-x toggle-word-wrap
   Spell checking       ALT-x flyspell-mode
@@ -39,32 +39,9 @@
   Compile some code    ALT-x compile
   List packages        ALT-x package-list-packages
 
-#  Sudoing within eshell
-
-  By default when using the sudo command within eshell you'll just
-  get "permission denied" messages. To overcome that type:
-
-    alias sudo '*sudo $*'
-
 # Line numbers
 
   To add line numbers and enable moving to a line with CTRL-l:
 
     (global-set-key "\C-l" 'goto-line)
     (add-hook 'find-file-hook (lambda () (linum-mode 1)))
-
-# Org-mode
-
-  To begin org-mode                            ALT-x org-mode
-  Table column separator                       Vertical/pipe character
-  Reorganize table                             TAB
-  Section heading                              *
-  Open/collapse section                        TAB
-  Open/collapse All                            CTRL-TAB
-  Export in other file formats (eg HTML,PDF)   CTRL-c CTRL-e
-
-  To make org-mode automatically wrap lines:
-
-    (add-hook 'org-mode-hook
-              '(lambda ()
-                 (visual-line-mode 1)))

cheat/cheatsheets/ffmpeg

@@ -2,7 +2,14 @@
 ffmpeg -i path/to/file.ext
 
 # Convert all m4a files to mp3
-for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -ab 320k "${f%.m4a}.mp3"; done
+for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -vn -b:a 320k "${f%.m4a}.mp3"; done
+
+# Convert video
+# -g : GOP, for searchability
+ffmpeg -i input.ext -vcodec vp9 -acodec libopus -b:v 21000k -b:a 320k -g 150 -threads 4 output.ext
+
+# Convert image sequence to video
+ffmpeg -r 18 -pattern_type glob -i '*.png' -b:v 21000k -s hd1080 -vcodec vp9 -an -pix_fmt yuv420p -deinterlace output.ext
 
 # Listen to 10 seconds of audio from a video file
 #
@@ -10,3 +17,4 @@ for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -ab 320k "${f%.m4a}.mp3"; d
 # -t  : seconds to cut
 # -autoexit : closes ffplay as soon as the audio finishes
 ffmpeg -ss 00:34:24.85 -t 10 -i path/to/file.mp4 -f mp3 pipe:play | ffplay -i pipe:play -autoexit
+

cheat/cheatsheets/org-mode

@@ -0,0 +1,46 @@
+  Begin org-mode                               ALT-x org-mode
+  Save					       CTRL-x CTRL-s
+  Export in other file formats (eg HTML,PDF)   CTRL-c CTRL-e
+  
+# Outline
+
+  Section heading                              *
+  New headline				       ALT-return
+  Move headline up or down		       ALT-up_arrow/down_arrow
+  Adjust indent depth of headline	       ALT-left_arrow/right_arrow
+  Open/collapse section                        TAB
+  Open/collapse All                            CTRL-TAB
+
+# To-Do Lists
+
+  Mark list item as TODO		       ** TODO
+  Cycle through workflow		       SHIFT-left_arrow/right_arrow
+  Show only outstanding TODO items	       CTRL-c CTRL-v
+
+# Tables
+
+  Table column separator                       Vertical/pipe character
+  Reorganize table                             TAB
+  Move column				       ALT-left_arrow/right_arrow
+  Move row				       ALT-up_arrow/down_arrow
+
+# Styles
+
+  *bold*
+  /italic/
+  _underlined_
+  =code=
+  ~verbatim~
+  +strike-through+
+
+# Heading
+
+  Header				       -*- mode: org -*-
+
+# .emacs
+
+  To make org-mode automatically wrap lines:
+
+    (add-hook 'org-mode-hook
+              '(lambda ()
+                 (visual-line-mode 1)))

cheat/cheatsheets/pkgtools

@@ -0,0 +1,27 @@
+# Create a Slackware package from a structured directory and sub-tree
+$ cd /path/to/pkg/dir
+$ su - c 'makepkg --linkadd y --chown n $foo-1.0.3-x86_64-1_tag.tgz'
+
+
+# Install a Slackware package
+installpkg foo-1.0.3-x86_64-1.tgz
+
+# Install a Slackware package to non-standard location
+ROOT=/path/to/dir installpkg foo-1.0.4-noarch-1.tgz
+
+# Create backup of files that will be overwritten when installing
+tar czvf /tmp/backup.tar.gz $(installpkg --warn foo-1.0.4-noarch-1.tgz)
+
+
+# Upgrade a Slackware package including files only in new version
+upgradepkg --install-new foo-1.0.6-noarch-1.tgz
+
+# Upgrade a Slackware package even if version is the same
+upgradepkg --reinstall foo-1.0.4-noarch-1.tgz
+
+
+# Remove a Slackware package
+removepkg foo-0.2.8-x86_64-1
+
+# Remove a Slackware package, retaining a backup (uninstalled) copy
+removepkg -copy foo-0.2.8-x86_64-1  # -> /var/log/setup/tmp/preserved_packages/foo...

cheat/cheatsheets/rpm2cpio

@@ -0,0 +1,5 @@
+# List contents of RPM
+rpm2cpio foo.rpm | cpio -vt
+
+# Extract contents of RPM
+rpm2cpio foo.rpm | cpio -vid

cheat/cheatsheets/sport

@@ -0,0 +1,32 @@
+# Sync to newest SlackBuild.org tree
+sport r
+
+# Search (fuzzy) SlackBuild tree for packages foo and BaR
+sport s foo bar
+
+# Operate from alternate build tree
+SBOPATH=/path/to/tree sport s foo
+
+# View info and README of BaR (not fuzzy)
+sport c foo BaR
+
+# Build a package
+sport i --build-only foo
+
+# Build and install package foo and BaR
+sport i foo BaR
+
+# Build and install package from current directory
+sport i .
+
+# Upgrade instead of install
+INSTALLER=upgradepkg sport i foo
+
+# Build dependency list for baz
+echo "foo BaR" >> /tmp/baz.list
+
+# Install list of packages from file
+sport i $(< /tmp/baz.list)
+
+# Check if package is installed
+sport k foo

cheat/cheatsheets/trashy

@@ -0,0 +1,14 @@
+# Trash foo and bar
+trash foo bar
+
+# Trash "foo bar"
+trash foo\ bar
+
+# List files in trash
+trash -v --list
+
+# Restore foo from trash
+trash --restore foo
+
+# Empty trash
+trash --empty