Scenario: You have edited some code from a tarball-snapshot, creating a fresh git repository in the source tree alongthe way. Now you want to merge your edits into the original repository, but you do not have the original history in the fresh repo. You also want to selectively squash or reorder some commits.

A word of warning beforehand: Be very careful if those repositories have different roots (e.g. one has just a subdirectory of the other repo).

The repo created from the tarball will be called tmprepo in what follows. Making a bac...

If MikTeX' package manager tells you it cannot connect to the server withiout giving a clear reason, check twice you got the proxy settings right ..

Bitwise logical operations in R can be realised on hexadecimal or octal inputs:

a <- as.hexmode(c("FE","eb"))
b <- as.hexmode(c(0x37,0x42))


# logical and
`&.hexmode`(a,b)
a & b

# logical or
`|.hexmode`(a,b)
a | b

# exclusive or
xor.hexmode(a,b)

The bitOps package works by interpreting the inputs as unsigned 32-bit integers.

require(bitops)
bitAnd(a, b)
bitOr (a, b)
bitXor(a, b)

So you set up your {Ku,Lu,U}buntu-VM inside VirtualBox and want to export it as an appliance as small as possible. Do this. (Tested with Lubuntu 14.04)

0. install zerofree: sudo apt-get install zerofree

1. remove unneeded packages (optional) sudo apt-get autoremove

2. empty cache of downloaded packages

   sudo apt-get autoclean
   sudo apt-get clean
   

3. to zero out the free space, we need runlevel 1, but telinit 1 is useless due to a bug around since at least Ubuntu 11.04, so...
   0. make a snapshot
   0. reboo...

Pandoc/Markdown Export

install the NppExec-Plugin, then select Extensions -> NppExport -> Execute... (or hit F6). You can select or edit scripts here, e.g. PDF-Export through pdflatex

cd "$(CURRENT_DIRECTORY)"
pandoc "$(FILE_NAME)" -o "$(NAME_PART).pdf" -V geometry:margin=1in --latex-engine=pdflatex

or export to .docx

cd "$(CURRENT_DIRECTORY)"
pandoc "$(FILE_NAME)" -o "$(NAME_PART).docx"

see this GIST: https://gist.github.com/jrgcmu/3ccc11c0412f45f9a6a4

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Can't remember those switches for tar etc.?

Unzipping

tar

plain: tar -xvf archive_name.tar.gz
bz2: tar -jxvf archive_name.tar.bz2 -C /tmp/extract_here/
xz: tar -Jxvf archive_name.tar.xz
gz: tar -zxvf archive_name.tar.gz

zip

unzip archive_name.zip

Zipping

tar

plain tar -cvf archive_name.tar directory_to_compress
bz2: tar -jcvf archive_name.tar.bz2 directory_to_compress
xz: tar -Jcvf archive_name.tar.xz directory_to_compress
gz: `tar -zcvf archive_name.tar.gz directory_t...