Merge pull request #127 from terminalforlife/master

New Files & Examples (Including `ffmpeg`, Per #124)

sheets/ffmpeg

@@ -0,0 +1,28 @@
+# ffmpeg
+# Tools for transcoding, streaming and playing of multimedia files
+
+# Convert IN_FILE to OUT_FILE, based on its extension. So, if your IN_FILE has
+# the `.mp3` extension and your OUT_FILE has the `.ogg` extension, then your
+# file will be converted -- but original kept in-tact -- to an OGG file.
+ffmpeg -i IN_FILE OUT_FILE
+# Remove the original upon successful completion of ffmpeg(1).
+ffmpeg -i IN_FILE OUT_FILE && rm -v IN_FILE
+
+# Convert all MP3s in the CWD to OGGs, deleting the originals when successfully
+# converted. This will be a huge time-saver! Note that this is Bash syntax.
+# By the way, this example works non-recursively.
+for File in *.mp3; { [ -f "$File" ] || continue; ffmpeg -i "$File" "${File%.mp3}.ogg" && rm -v "$File"; }
+
+# Obviously ffmpeg(1) works with audio files, but it can also work on images.
+# This example will convert a JPEG image to the PNG format.
+ffmpeg -i ImageFile.jpg ImageFile.png
+
+# By default, ffmpeg(1) is really verbose, so shut it up, displaying only the
+# more important information, by using the `-v` flag, followed by its `0`
+# argument; this argument means that only 'panic' messages will be shown. Refer
+# to the ffmpeg(1) man page for more information on these levels of logging.
+ffmpeg -v 0 -i IN_FILE OUT_FILE
+
+# If you want to see ongoing but not over-the-top statitics for the file on
+# which ffmpeg(1) is currently working, you can make use of the `-stats` flag.
+ffmpeg -stats -i IN_FILE OUT_FILE

sheets/perl

@@ -48,3 +48,13 @@ perl -ne '/^$ARGV[0]::$</ and print(STDERR "WARNING: User has an empty password.
 
 # Display the current user's UID and GID in a format ideal for chmod(1).
 perl -e 'print("$<:" . (split(" ", $)))[0] . "\n")'
+
+# Permissions allowing, output the first 512 bytes of an MBR storage device, -
+# where the partition table should be stored, using Perl's read() function.
+#
+# Note that the 2-argument style open() should not be used unless the file is
+# static; no chance of changing to something potentially problematic.
+#
+# You might spot some printable strings, such as 'LILO' or 'GRUB', if you've
+# also stored your bootloader on the MBR of the storage device (non-UEFI).
+perl -e 'open(my $FH, "</dev/sda"); read($FH, my $Data, 512); close($FH); print("$Data\n")'