Delete empty lines from file

perl -pi -e 's/^\n$//' file.txt

AG PI BibTeX key scheme for JabRef

Key pattern -> default pattern
[auth3_1:upper:]:[auth3_2:upper:]:[auth3_3:upper:]:[auth3_4:upper:]:[auth3_5:upper:]:[auth3_6:upper:]:[auth3_7:upper:]:[auth3_8:upper:]:[auth3_9:upper:]:[auth3_10:upper:]:[year]

Regular Expression

replace 

:+

with

:

Cross out terms or text in LaTeX

Required package: cancel

\usepackage{cancel}

You can make the following

with the following LaTeX source code:

\[ a + b + \cancel{c} = \cancel{c} + d + e \]

You can also zero out a term in an equation looking like

with the following LaTeX source code:

\[ a + b + \cancelto{0}{c} = d + e \]

Find out whether sparc machine is 32 or 64 bit

If you want to find out if your machine is 32 or 64 bit, simply type in the following:

isainfo -v

Finding out about the type of machine (sparc vs x86) is

uname -a

Check whether binary was compiled for 64 bit

linse@zebrano ~/release/RNAforester-1.5 $ file /vol/rnaforester2/bin/RNAforester
/vol/rnaforester2/bin/RNAforester: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), not stripped, uses CMOV SSE SSE2