Commands wrapped within BackTicks
have their output turned into a scalar and returned. This allows programmers to capture the output of a command for later use. This construct is found in many UnixShell
s and in some programming languages such as PerlLanguage
, and RubyLanguage
Example: Putting the current year in a variable (for /bin/sh compatible shells)
If the current year were 2004, this would output (surprise) "2004".
Also a good reason to practice PairTickInspection?
. Back ticks are often difficult to identify and remove when inspecting alone.
Backticks can represent a serious security hazard if unvalidated text is executed (such as from a web page). Someone nasty could then get your CGI script to execute rm -r
are used as a quick and dirty way to inspect an object. Compare
which calls thing's __str__ method (it prints the result of str(thing)), with
which calls thing's __repr__ method (it prints the result of repr(thing)). (These are equivalent to comparing the outputs from an object's to_s and inspect methods in RubyLanguage
, or the outputs from Ruby's puts and p.)
Note that backticks are deprecated and have been removed in Python 3. They should be replaced with a direct call to the repr() function instead.
I used to use BackTicks
. When i started my most recent job, i was mocked for not writing
instead. Now i am all about the $(). Dollar for the win. Comply.
, you can use a regular function as an infix operator by surrounding the function name with BackTicks