Ruby 101 : File System Directory Operations - Novice to Expert in ONE Day
In this video, we go over functions provided by ruby for performing filesystem operation in directories. You'll find a lot of places where filesystem navigation is required such for finding required YAML files or libraries and I intend to make you guys experts in directory navigation using this lesson!! :)
Let's keep the momentum going to becoming ruby experts in a single day!
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The functions we cover include
Base functions
pwd/getwd - Gets current working directory. Starts on the directory where script is executed and changes when pwd or chdir is executed
home - Home directory of current user
Creation
mkdir - make a directory
delete/rmdir - deletes a directory
exist? - check if directory exists
empty? - check if directory is empty
Navigation
chdir - changes directory
entries - list all children (including standard directory links "." and ".."
children - list only children (excludes "." and "..")
glob - search utility
================Glob Flags ==========================
*
Matches any file. Can be restricted by other values in the glob. Equivalent to / .* /x in regexp.
*
Matches all files
c*
Matches all files beginning with c
*c
Matches all files ending with c
c
Match all files that have c in them (including at the beginning or end).
Note, this will not match Unix-like hidden files (dotfiles). In order to include those in the match results, you must use the File::FNM_DOTMATCH flag or something like "{*,.*}".
**
Matches directories recursively.
?
Matches any one character. Equivalent to /.{1}/ in regexp.
[set]
Matches any one character in set. Behaves exactly like character sets in Regexp, including set negation ([^a-z]).
{p,q}
Matches either literal p or literal q. Equivalent to pattern alternation in regexp.
\
Escapes the next metacharacter.
=====================================================
Low Level Child Navigation
open/new - open a directory and give reference pointer to first child
read - read child and seek to next postiion
seek - seek to a particular child (starts from 0)
tell/pos - tells current position of pointer
rewind - resets pointer to 0
close - closes directory resource
to_path - full path of operator used to initialize this
Comment below for any questions you want answered.
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