Linux 常用命令

查看文件准确的字节数

wc type.txt

命令参数：
-c 统计字节数。
-l 统计行数。
-m 统计字符数。这个标志不能与 -c 标志一起使用。
-w 统计字数。一个字被定义为由空白、跳格或换行字符分隔的字符串。
-L 打印最长行的长度。
-help 显示帮助信息
--version 显示版本信息

说明：
57 243 9599 type.txt
行数 单词数 字节数 文件名

将RFC文本的行与下一行连接起来

RFC txt文档默认换行方式是这样的，现在要将其下一行与上一行末尾连起来。

🦋 michael ☯︎ : ~$ cat rfc.txt
The pseudo-random number generation algorithm MUST be chosen so that
   different hosts do not generate the same sequence of numbers.  If the
   host has access to persistent information that is different for each
   host, such as its IEEE 802 MAC address, then the pseudo-random number
   generator SHOULD be seeded using a value derived from this
   information.  This means that even without using any other persistent
   storage, a host will usually select the same IPv4 Link-Local address
   each time it is booted, which can be convenient for debugging and
   other operational reasons.  Seeding the pseudo-random number
   generator using the real-time clock or any other information which is
   (or may be) identical in every host is NOT suitable for this purpose,
   because a group of hosts that are all powered on at the same time
   might then all generate the same sequence, resulting in a never-
   ending series of conflicts as the hosts move in lock-step through
   exactly the same pseudo-random sequence, conflicting on every address
   they probe.

🦋 michael ☯︎ : ~$ cat rfc.txt | xargs echo
The pseudo-random number generation algorithm MUST be chosen so that different hosts do not generate the same sequence of numbers. If the host has access to persistent information that is different for each host, such as its IEEE 802 MAC address, then the pseudo-random number generator SHOULD be seeded using a value derived from this information. This means that even without using any other persistent storage, a host will usually select the same IPv4 Link-Local address each time it is booted, which can be convenient for debugging and other operational reasons. Seeding the pseudo-random number generator using the real-time clock or any other information which is (or may be) identical in every host is NOT suitable for this purpose, because a group of hosts that are all powered on at the same time might then all generate the same sequence, resulting in a never- ending series of conflicts as the hosts move in lock-step through exactly the same pseudo-random sequence, conflicting on every address they probe.