Difference between revisions of "Get the parent of a file path"
From CodeCodex
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==Implementations== | ==Implementations== | ||
− | === | + | |
+ | ===Erlang=== | ||
<pre> | <pre> | ||
+ | % Get the parent of a relative filename path | ||
+ | filename:dirname("test/codex.erl"). % "test" | ||
+ | filename:dirname("codex.erl"). % "." | ||
+ | |||
+ | % Get the parents of an absolute filename path | ||
+ | filename:dirname("/usr/src/codex.erl"). % "/usr/src" | ||
+ | </pre> | ||
+ | |||
+ | ===Java=== | ||
+ | <pre class="java"> | ||
// Get the parent of a relative filename path | // Get the parent of a relative filename path | ||
File file = new File("Ex1.java"); | File file = new File("Ex1.java"); | ||
Line 21: | Line 32: | ||
===Ruby=== | ===Ruby=== | ||
− | <pre> | + | <pre class="ruby"> |
Dir.chdir("/work") do | Dir.chdir("/work") do | ||
# Get the parent of a relative filename path | # Get the parent of a relative filename path | ||
Line 38: | Line 49: | ||
</pre> | </pre> | ||
+ | [[Category:Erlang]] | ||
[[Category:Java]] | [[Category:Java]] | ||
[[Category:Ruby]] | [[Category:Ruby]] | ||
[[Category:I/O]] | [[Category:I/O]] |
Latest revision as of 18:25, 13 January 2011
Contents
Implementations[edit]
Erlang[edit]
% Get the parent of a relative filename path filename:dirname("test/codex.erl"). % "test" filename:dirname("codex.erl"). % "." % Get the parents of an absolute filename path filename:dirname("/usr/src/codex.erl"). % "/usr/src"
Java[edit]
// Get the parent of a relative filename path File file = new File("Ex1.java"); String parentPath = file.getParent(); // null File parentDir = file.getParentFile(); // null // Get the parents of an absolute filename path file = new File("D:\\almanac\\Ex1.java"); parentPath = file.getParent(); // D:\almanac parentDir = file.getParentFile(); // D:\almanac parentPath = parentDir.getParent(); // D:\ parentDir = parentDir.getParentFile(); // D:\ parentPath = parentDir.getParent(); // null parentDir = parentDir.getParentFile(); // null
- Original Source: The Java Developers Almanac 1.4
Ruby[edit]
Dir.chdir("/work") do # Get the parent of a relative filename path fname = "backup/tmp.txt" p parent = File.dirname(fname) #=> "backup" p parent = File.dirname(parent) #=> "." p parent = File.dirname(parent) #=> "." # Get the parents of an absolute filename path p expath = File.expand_path(fname) #=> "C:/work/backup/tmp.txt" p parent = File.dirname(expath) #=> "C:/work/backup" p parent = File.dirname(parent) #=> "C:/work" p parent = File.dirname(parent) #=> "C:/" p parent = File.dirname(parent) #=> "C:/" end