oracle@localhost oracle]$if=/dev/zero of=./test.txt bs=1k count=1
oracle@localhost oracle]$ ls -l
total 4
-rw-r--r-- 1 oracle dba 1024 Jul 15 16:56 test.txt
eg,
find / -name access_log 2>/dev/null
这样，一些诸如一些错误信息就不会显示出来。
/dev/zero：
In Unix-like operating systems, /dev/zero is a special file that provides as many null characters (ASCII NULL, 0x00; not ASCII character "digit zero", "0", 0x30) as are read from it. One of the typical uses is to provide a character stream for overwriting information. Another might be to generate a clean file of a certain size. Using mmap to map /dev/zero to RAM is the BSD way of implementing shared memory.
# Initialise partition (important note: trying out this command will eradicate
# any files that were on the partition, make sure you have a backup of any important data.)
dd if=/dev/zero of=/dev/hda7
# Create a large empty file called 'foobar'
dd if=/dev/zero of=foobar count=1000 bs=1000
Like /dev/null, /dev/zero acts as a source and sink for data. All writes to /dev/zero succeed with no other effects (the same as for /dev/null, although /dev/null is the more commonly used data sink); all reads on /dev/zero return as many NULs as characters requested.
xwj369606094 于 2009-10-28 09:55:27发表:
菜鸟,不懂...
prinse 于 2009-10-27 21:47:16发表:
先把 linux 用上一段时间，你自然就会想到要用上这些设备了……
tomlei 于 2009-10-22 09:35:15发表:
谢谢楼上的前辈。学习了。。。{:3_114:}
ql08421032 于 2009-10-20 17:20:51发表:
完全看不懂阿
fanhuan 于 2009-10-20 13:35:47发表:
学习了！
yangshan 于 2009-10-19 20:50:25发表:
特殊的文件 还有很多!
dragon008 于 2009-10-19 00:03:20发表:
一般用来创建文件用的，比如说要创建一个10m的文件，就是dd if=/dev/zero of=/mnt/temp.tmp bs=1M count=10
寻路行者 于 2009-10-18 15:37:08发表:
初学者，还没有学到那么多……
luciffer 于 2009-10-16 16:18:27发表:
zero 查英文字典意思为 0，无
lhm1986 于 2009-10-16 12:46:56发表:
谢谢。。。
hsvea 于 2009-10-16 10:35:03发表:
/dev/zero,是一个输入设备，你可你用它来初始化文件。
/dev/zero------该设备无穷尽地提供0，可以使用任何你需要的数目----设备提供的要多的多。他可以用于向设备或文件写入字符串0。
oracle@localhost oracle]$if=/dev/zero of=./test.txt bs=1k count=1
oracle@localhost oracle]$ ls -l
total 4
-rw-r--r-- 1 oracle dba 1024 Jul 15 16:56 test.txt
eg,
find / -name access_log 2>/dev/null
这样，一些诸如一些错误信息就不会显示出来。
/dev/zero：
In Unix-like operating systems, /dev/zero is a special file that provides as many null characters (ASCII NULL, 0x00; not ASCII character "digit zero", "0", 0x30) as are read from it. One of the typical uses is to provide a character stream for overwriting information. Another might be to generate a clean file of a certain size. Using mmap to map /dev/zero to RAM is the BSD way of implementing shared memory.
# Initialise partition (important note: trying out this command will eradicate
# any files that were on the partition, make sure you have a backup of any important data.)
dd if=/dev/zero of=/dev/hda7
# Create a large empty file called 'foobar'
dd if=/dev/zero of=foobar count=1000 bs=1000
Like /dev/null, /dev/zero acts as a source and sink for data. All writes to /dev/zero succeed with no other effects (the same as for /dev/null, although /dev/null is the more commonly used data sink); all reads on /dev/zero return as many NULs as characters requested.