show full path of a file

readlink -f filename gives the full absolute path. but if the file is a symlink, u'll get the final resolved name.

remove bash history under Linux

history -c 

history -w 

vim scp, etc

vimdiff a.sas scp://user@lpwcsmd1//data/b.sas 

note that / is used to separate host and path, so there are two slashes above.

git instaweb

`git instweb` can open a local http server for a git repo

imapsync all emails to one folder

use 

  --regextrans2 "s/.*/folder_on_Bmail\/$&/"

promise in R
#define PROMSXP 5 /* promises: [un]evaluated closure arguments */  
reference
pryr
and see force in R

see the version number of mac on command line

$ sw_vers

ProductName: Mac OS X

ProductVersion: 10.9.5

BuildVersion: 13F34

list function in an R package

> ls('package:rstan')

detect duplicate files

duff https://github.com/elmindreda/duff

fdupes http://premium.caribe.net/~adrian2/fdupes.html

rdfind http://rdfind.pauldreik.se/

and 

http://en.wikipedia.org/wiki/List_of_duplicate_file_finders

latex resizebox in a minipage for tabular with a caption

We can put tabular to resizebox to easily resize a table in latex. 

If it's in a minipage environment, we might need caption package to add captions. 

see http://tex.stackexchange.com/questions/124346/latex-error-not-in-outer-par-mode

paste: combine files horizontally

PASTE(1)                  BSD General Commands Manual                 PASTE(1)

NAME

     paste -- merge corresponding or subsequent lines of files

SYNOPSIS

     paste [-s] [-d list] file ...

count a character in each line

for example, if I want to check if a CSV file without quotes is valid, something like the following might help:

tr -d -c ',\n' < file | awk '{print length;}' | uniq

capture.output function in R

Once I was wondering how to return string from function str().  I guess capture.output is one way:

capture.output              package:utils              R Documentation

Send Output to a Character String or File

Description:

     Evaluates its arguments with the output being returned as a

     character string or sent to a file.  Related to 'sink' in the same

     way that 'with' is related to 'attach'.

Usage:

     capture.output(..., file = NULL, append = FALSE)

Arguments:

     ...: Expressions to be evaluated.

vim copy highlighted to

 In order not to retype the pattern that just have been used in search, one can press Ctrl+R, / to automatically insert last search pattern.

from http://stackoverflow.com/questions/6176659/how-to-copy-all-hlsearch-text-to-clipboard-in-vim

Fwd: Mac print to PDF without margin

We need to create a customized page size of say letter with margins being of zero inch. 

diff two folders

http://www.techrepublic.com/blog/linux-and-open-source/how-to-compare-the-content-of-two-or-more-directories-automatically/

# diff -rq folder1 folder2 

backref put page number in the reference list

\usepackage[pagebackref]{hyperref}

delete all unread message in gmail in a second

1. Input in:inbox is:unread to the search box:

2. select all and then delete.

git flow release a new version

gitflow how to release a new version

steps can be found here. In particular,

• create a release branch

  $ git checkout -b release-2.1 develop  

• work on the release branch such as bumping up the version

• merge to master and develop branch

• create a tag

  $ git checkout master  $ git merge --no-ff release-2.1  $ git tag -a v2.1   

• push the tag, see here

  $ git push origin v2.1 

excel on mac using letters to indicate columns

https://kb.wisc.edu/page.php?id=781

excel -> preference -> general -> use r1c1 reference style (uncheck it)