From 6cf69bc190c4f821a42ab6eb057e6531fb5e2e06 Mon Sep 17 00:00:00 2001
From: Shadab Zafar <dufferzafar0@gmail.com>
Date: Mon, 3 Aug 2015 17:44:58 +0530
Subject: [PATCH 1/3] Git cheats: Change date of existing commit

---
 cheat/cheatsheets/git | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cheat/cheatsheets/git b/cheat/cheatsheets/git
index 9aa57ca..469ee5d 100644
--- a/cheat/cheatsheets/git
+++ b/cheat/cheatsheets/git
@@ -22,6 +22,14 @@ git commit --date="`date --date='2 day ago'`"
 git commit --date="Jun 13 18:30:25 IST 2015"
 # more recent versions of Git also support --date="2 days ago" directly
 
+# To change the date of an existing commit
+git filter-branch --env-filter \
+    'if [ $GIT_COMMIT = 119f9ecf58069b265ab22f1f97d2b648faf932e0 ]
+     then
+         export GIT_AUTHOR_DATE="Fri Jan 2 21:38:53 2009 -0800"
+         export GIT_COMMITTER_DATE="Sat May 19 01:01:01 2007 -0700"
+     fi'
+
 # To removed staged and working directory changes
 git reset --hard
 

From 196875a828ca6ac0b6e9ab00d08d5b6db21ac95a Mon Sep 17 00:00:00 2001
From: Shadab Zafar <dufferzafar0@gmail.com>
Date: Mon, 3 Aug 2015 17:45:38 +0530
Subject: [PATCH 2/3] Git cheats: Shallow clones & Submodule update

---
 cheat/cheatsheets/git | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cheat/cheatsheets/git b/cheat/cheatsheets/git
index 469ee5d..b5c142b 100644
--- a/cheat/cheatsheets/git
+++ b/cheat/cheatsheets/git
@@ -94,3 +94,13 @@ git diff --no-index path/to/file/A path/to/file/B
 # To pull changes while overwriting any local commits
 git fetch --all
 git reset --hard origin/master
+
+# Update all your submodules
+git submodule update --init --recursive
+
+# Perform a shallow clone to only get latest commits
+# (helps save data when cloning large repos)
+git clone --depth 1 <remote-url>
+
+# To unshallow a clone
+git pull --unshallow

From af354ba6a3df94e46333c55a645d637a5d26cb61 Mon Sep 17 00:00:00 2001
From: Shadab Zafar <dufferzafar0@gmail.com>
Date: Mon, 3 Aug 2015 17:48:15 +0530
Subject: [PATCH 3/3] New Sheet: ffmpeg - fast audio video encoder

---
 cheat/cheatsheets/ffmpeg | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 cheat/cheatsheets/ffmpeg

diff --git a/cheat/cheatsheets/ffmpeg b/cheat/cheatsheets/ffmpeg
new file mode 100644
index 0000000..952c45b
--- /dev/null
+++ b/cheat/cheatsheets/ffmpeg
@@ -0,0 +1,12 @@
+# Print file metadata etc.
+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
+
+# Listen to 10 seconds of audio from a video file
+#
+# -ss : start time
+# -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