Export Bash Variable for Perl Command One-liner

How to use shell variables in perl command call in a bash shell script?

mydate=10/10/2012
export mydate
perl -e 'print "my date is $ENV{mydate}\n"'

Parameter Expansion Explained

An introduction to parameter expansion in Bash (Recommended)

Parameter Expansion

Shell Parameter Expansion

How to Make a Request of a Busy People

5 Tips for E-mailing Busy People

Vi Editor: Exit ^X Mode

Ctrl+q

mmlsquota

mmlsquota command

Modifiy Python matplotlib Backend Settings

To find the location of configuration file:
>>> import matplotlib
>>> matplotlib.matplotlib_fname()

Edit the matplotlib configuration file:
Modify "backend : tkagg" to "backend : Agg", for example.

More of Customizing matplotlib.

Sed Edit in Place

sed edit the file in place