一、
新建文件
本文转自敏捷的水博客园博客，原文链接http://www.cnblogs.com/cnblogsfans/archive/2009/09/17/1568804.html如需转载请自行联系原作者
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f=
File
.
new
(
File
.join(
"C:"
,
"Test.txt"
),
"w+"
)
f.puts(
"I am Jack"
)
f.puts(
"Hello World"
)
|
文件模式
"r" ：Read-only. Starts at beginning of file (default mode).
"r+" ：Read-write. Starts at beginning of file.
"w" ：Write-only. Truncates existing file to zero length or creates a new file for writing.
"w+" ：Read-write. Truncates existing file to zero length or creates a new file for reading and writing.
"a" ：Write-only. Starts at end of file if file exists; otherwise, creates a new file for writing.
"a+" ：Read-write. Starts at end of file if file exists; otherwise, creates a new file for reading and writing.
"b" ：(DOS/Windows only.) Binary file mode. May appear with any of the key letters listed above
二、读取文件
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file=
File
.open(
File
.join(
"C:"
,
"Test.txt"
),
"r"
)
file.
each
{ |line| print
"#{file.lineno}."
, line }
file.close
|
输出：
1.白日依山尽
2.黄河入海流
3.欲穷千里目
4.更上一层楼
三、新建、删除、重命名文件
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File
.
new
(
"books.txt"
,
"w"
)
File
.rename(
"books.txt"
,
"chaps.txt"
)
File
.delete(
"chaps.txt"
)
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三、目录操作
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创建目录
Dir
.mkdir(
"c:/testdir"
)
#删除目录
Dir
.rmdir(
"c:/testdir"
)
#查询目录里的文件
p
Dir
.entries(
File
.join(
"C:"
,
"Ruby"
)).join(
' '
)
#遍历目录
Dir
.entries(
File
.join(
"C:"
,
"Ruby"
)).
each
{
|e| puts e
}
|
输出：
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2
|
"C:/studyruby"
"c:/ruby"
|
查看目录信息
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d:\Study\rubysample>irb
irb(main):
001
:
0
> dir=
Dir
.open(
File
.join(
"C:"
,
"Ruby"
) )
=>
#
irb(main):
002
:
0
> dir.path
=>
"C:/Ruby"
irb(main):
003
:
0
> dir.tell
=>
0
irb(main):
004
:
0
> dir.read
=>
"."
irb(main):
005
:
0
> dir.rewind
=>
#
irb(main):
006
:
0
> dir.
each
{|e| puts e}
.
..
bin
ChangeLog.txt
doc
lib
LICENSE
.txt
man
MANIFEST
misc
README
.1st
ReleaseNotes.txt
ruby.ico
rubyopt.del
rubyw.ico
samples
scite
share
src
uninstall.exe
=>
#
irb(main):
007
:
0
>
|
王德水
