Utility functions
We've used a lot of self-written functions. It's time to have a look at them. Let's open the top half of the utils.lua
file, in the preceding screenshot.
The first three functions serve mainly to build the fourth function, stamp()
, that we use throughout our scripts to do structured logging.
shell()
is an example of a typical Lua interaction with an operating system. It executes a command, and returns the output as a string. We use it in stamp()
to obtain the result of the command date
.
trim()
uses Lua native string manipulation, and is equivalent to the chomp()
command in Perl, and many similar others in different languages: it deletes the trailing newline in a string, if it exists, and returns the string without the newline.
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