Monday, January 30, 2017

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.

Wednesday, January 13, 2016

remove bash history under Linux

history -c 
history -w 

vim scp, etc

vimdiff scp://user@lpwcsmd1//data/ 

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

Wednesday, January 21, 2015

git instaweb

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

Tuesday, November 18, 2014

imapsync all emails to one folder


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

Monday, October 27, 2014

promise in R

promise in R

#define PROMSXP 5 /* promises: [un]evaluated closure arguments */  



and see force in R

Tuesday, September 23, 2014

see the version number of mac on command line

$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.9.5
BuildVersion: 13F34