====== Bash snippets ======
http://www.commandlinefu.com

===== Git =====
<code bash>
git checkout  -b test5 && git rebase --autosquash --interactive  --root test5
</code>
===== Play YouTube Playlists =====
<code bash>
youtube-dl \
    -f 'bestvideo[vcodec=vp9]+bestaudio[acodec=opus]' \
    --merge-output-format mkv \
    -o 'id_%(playlist_index)s - %(title)s (%(id)s).%(ext)s' \
    --playlist-start 1 \
    --playlist-end 19 \
    'https://youtube.com/playlist/url'
mkvmerge -o all_001-019.mkv \[ id_{1..19}\ * \]
mpv --save-position-on-quit all_001-019.mkv
</code>

<WRAP center round important 60%>
  * Achte auf ''['' und '']'' um die input Videos im //append// Modus zu mergen
  * Der glob ''*'' sortiert nicht numerisch (aber ''*(n)'' geht auch)
</WRAP>


Geeignete Formate finden:
<code bash>
youtube-dl -F 'https://youtube.com/playlist/url' | \
grep -E '^[0-9]+' | \
sort -nr | \
uniq -w 10 -c | \
sort -nrs
</code>

<WRAP center round important 60%>
Achte auf die Hardware-Beschleunigung (siehe ''vainfo'')
</WRAP>

===== Order files and directories recursive by date =====
Order all files and directories in a certain subdirectory by date of last modification
<code bash>
find <dir> -print0 | xargs -0 ls -ldt | less
</code>


===== Proxy via SSH =====
  ssh -D 4242 lmu
  
Im Browser kann dann der SOCKS Proxy "localhost" auf "4242" eingestellt werden.

===== List most used bash commands =====
<code bash>
history | cut -c 8- | cut -f 1 -d ' ' | sort | uniq -c | sort -n -r
</code>

The result:
<code>
    101 l
     69 c
     40 mupdf
     24 mv
     16 sudo
     16 history
     12 vlc
     12 rm
     12 man
     10 zip
     10 pdflatex
      9 ps
      9 exit
      9 echo
      7 while
      7 ssh
      7 pacman
      7 mplayer
      7 ln
      6 wget
      6 umount
      6 cat
      5 sml
      5 mkdir
      5 acroread
....
</code>

===== SSH key =====
<code bash>
ssh-keygen
ssh-keygen -t ecdsa
ssh-keygen -t ed25519

ssh-copy-id -i ~/.ssh/id_rsa.pub ${R_USER}@${R_HOST}
</code>

===== List modified files =====
<code>
pacman -Qii | grep ^MODIFIED | sort
find /etc/ -type f | while read f ; do pacman -Qo "$f" >/dev/null 2>&1 || echo "$f" ; done
</code>

===== Install termcaps =====
<code bash>
infocmp rxvt-unicode-256color | s $YOUR_HOST "cat >~/tmp-term-info && tic ~/tmp-term-info && rm ~/tmp-term-info"
</code>

===== Pacman =====
Removing packages and their dependencies
<code bash>
pacman -Rs
</code>

Clean the package cache of packages that are not currently installed
<code bash>
pacman -Sc
</code>

Clean the entire package cache
<code bash>
pacman -Scc
</code>

===== Parameterübergabe =====
http://mywiki.wooledge.org/BashFAQ/050

===== rsync =====
  * ''-X'' / ''%%--xattr%%''
  * ''-S'' \\ Sparse Files
  * ''-H'' \\ Hard links
  * ''-a'' \\ Archive
  * ''-u'' / ''%%--update%%''
  * ''-A'' / ''%%--acls%%''
  * ''-E'' \\ Speichere executable bit mit
  * ''%%--progress%%''

=> ''%%rsync -aAxuHS --progress%%''

===== Bling stat Beep =====
http://netbuz.org/blog/2011/11/x-bells-and-urgency-hints/

===== Müll deaktivieren =====
<code bash>
chmod a-x /usr/lib/colord/colord
chmod a-x /usr/lib/gvfs/gvfsd
chmod a-x /usr/lib/gvfs/gvfsd-*
chmod a-x /usr/bin/kactivitymanagerd
chmod a-x /usr/lib/at-spi2-core/at-spi-bus-launcher
chmod a-x /usr/bin/knotify4
</code>


===== diff & patch =====
  * ''diff -u original.c new.c > original.patch''
  * ''patch -p1 < baz.patch''

===== Find =====
==== In small files ====
<code bash>
find ...  -size -20k -type f -exec grep ... {} + 
</code>

==== Files not belonging to the current user ====
<code bash>
find \! -user $(whoami) -exec ls --color=always -ld {} +
</code>
oder mit meinem ''notmine'' alias.

==== Big files ====
<code bash>
find / -type f -size +300M -exec ls --color=always -l {} +
</code>
====== pentadactyl ======
http://nakkaya.com/2014/01/26/pentadactyl-configuration/

<code>
set scrollsteps=1
set scrolltime=0
set incfind
set hlfind
</code>

====== SSL ======
  nmap --script ssl-enum-ciphers -p 443 onmars.eu
  sslscan --no-failed onmars.eu
  openssl ciphers | tr : '\n' | sort

====== SCP / sshfs / sftp absichern ======
<code bash>
wget https://github.com/mysecureshell/mysecureshell/archive/v2.00.tar.gz
tar -xvf v2.00.tar.gz
cd mysecureshell-2.00
## root check aus install.sh entfernen
mkdir -p "$HOME/mysecureshell/"{bin,etc}
./configure \
  --prefix="$HOME/mysecureshell" \
  --with-conffile="$HOME/mysecureshell/sftp_config" \
  --with-logfile="$HOME/mysecureshell/sftp-server.log" \
  --with-shutfile="$HOME/mysecureshell/sftp.shut" \
  --exec-prefix="$HOME/mysecureshell"
make all
</code>

Config
<code xml>
## http://mysecureshell.readthedocs.io/en/latest/index.html

<Default>
    Home            /                                                         
    ApplyFileSpec   OnlyData
</Default>

<FileSpec OnlyData>
    UseFullPath true
    Order AllowDeny
    Allow "^/(foo/1/?|foo/2/?|bar/baz/?|$|foo/?$|bar/?$)"
    Deny all
</FileSpec>
</code>

====== CUPS ======
Delete all learned Network printers:
<code bash>
lpstat -s | \grep ///dev/null | cut -c 12- | cut -d: -f1 | xargs -n1 -- lpadmin -x 
</code>

====== Zu schlecht für ein dotfile ======
Hier sind scripte, die zwar eine nette Idee, aber viel zu schlecht für ein dotfile sind.
<code bash>
( pgrep bash | xargs -n 1 pstree -Uangpsu ) | sed 's/^\([ │├─└]*\)\(\({[^,]*\)\|\([^,]*\)\),\([0-9]*\),\([0-9]*\)\(,\(\w*\)\|\)/\1 \x1b[1;30m\3\x1b[0m\x1b[1;37m\4\x1b[0m \x1b[36m\5\x1b[0m \x1b[34m\6\x1b[0m \x1b[33m\8\x1b[0m/'
</code>

<code bash>
## https://gitlab.labs.nic.cz/labs/dnssec-validator/issues/38
JAR="`echo ~/.moonchild\ productions/pale\ moon/*.default/extensions/dnssec@nic.cz/chrome/dnssec.jar`"

cd "`mktemp -d`"
unzip -q "$JAR"
patch -p1 <<EOF
--- a/content/firefoxOverlay.xul	2015-12-13 03:53:26.236938476 +0100
+++ b/content/firefoxOverlay.xul	2015-12-13 03:54:16.686429894 +0100
@@ -102,7 +102,7 @@
 
 	</popupset>
 
-	<textbox id="urlbar">
+	<statusbar id="status-bar">
 	<box id="urlbar-icons">
 	<!-- DNSSEC button in urlbar -->
 		<hbox id="dnssec-box" role="button"
@@ -121,5 +121,5 @@
         <!-- /stack -->
 	</hbox>
 	</box>
-	</textbox>
+	</statusbar>
 </overlay>
EOF

zip "$JAR" content/firefoxOverlay.xul
</code>

<code>
smartctl -x /dev/sda
</code>


<code python>
for i in [2, 1.9, 1.5, 1.1, None, 0, None, -1.1, -1.5, -1.9, -2]:
    print('-'*105 if i is None else f'{i: .1f}: ceil = {math.ceil(i): } || round = {round(i): } | int(i+.5) = {int(i+0.5): } || floor = {math.floor(i): } | int = {int(i): } || int(i)+1 = {int(i)+1: } | int(i)-1 = {int(i)-1: }')
</code>
<code>
 2.0: ceil =  2 || round =  2 | int(i+.5) =  2 || floor =  2 | int =  2 || int(i)+1 =  3 | int(i)-1 =  1
 1.9: ceil =  2 || round =  2 | int(i+.5) =  2 || floor =  1 | int =  1 || int(i)+1 =  2 | int(i)-1 =  0
 1.5: ceil =  2 || round =  2 | int(i+.5) =  2 || floor =  1 | int =  1 || int(i)+1 =  2 | int(i)-1 =  0
 1.1: ceil =  2 || round =  1 | int(i+.5) =  1 || floor =  1 | int =  1 || int(i)+1 =  2 | int(i)-1 =  0
---------------------------------------------------------------------------------------------------------
 0.0: ceil =  0 || round =  0 | int(i+.5) =  0 || floor =  0 | int =  0 || int(i)+1 =  1 | int(i)-1 = -1
---------------------------------------------------------------------------------------------------------
-1.1: ceil = -1 || round = -1 | int(i+.5) =  0 || floor = -2 | int = -1 || int(i)+1 =  0 | int(i)-1 = -2
-1.5: ceil = -1 || round = -2 | int(i+.5) = -1 || floor = -2 | int = -1 || int(i)+1 =  0 | int(i)-1 = -2
-1.9: ceil = -1 || round = -2 | int(i+.5) = -1 || floor = -2 | int = -1 || int(i)+1 =  0 | int(i)-1 = -2
-2.0: ceil = -2 || round = -2 | int(i+.5) = -1 || floor = -2 | int = -2 || int(i)+1 = -1 | int(i)-1 = -3
</code>