不带反斜杠的第一个后引号终止命令替换。
The first backquote not preceded by a backslash terminates the command substitution.
上面所做的称为“命令替换”。
如果愿意，可以使用反撇号进行命令替换。
If you prefer, you can use the back-ticks for command substitution. It achieves the same result.
做命令替换不影响壳的状态？
我们曾经在清单9中创建了一个强制制表符，您可以从中看到命令替换的例子。
You saw an example of command substitution in Listing 9 when we created a captive TAB character.
可以使用CHANGE命令替换SQLBufferUtility中的特定字符串。
A particular string in the SQL Buffer Utility can be replaced using the CHANGE command.
我们还可以使用该命令替换给定行号的缓冲区中的文本，或者删除当前行中第一个出现的字符串。
We can also replace the text in the buffer at a given line number or remove the first occurrence of a string in the current line, using this utility.
您还会注意到，我们用' p '命令替换了'd '命令，如您所猜想的那样，这明确要求sed打印模式空间。
You'll also notice that we've replaced the 'd' command with the 'p' command, which as you might guess, explicitly commands sed to print the pattern space.
可以在命令行上使用命令替换，但在脚本中使用它则更常见；您将在本系列的后续文章中更多地了解它和脚本。
Command substitution is used at the command line, but more frequently in scripting; you will learn more about it and scripting in later articles of this series.
对我们所有的尊贵供应者：当你知道钩住有变更方式他们命令替换部份以便他们将比较好的服务他们的客户装于罐头。
To all our valued Suppliers: as you know Hooker has been changing the way they order replacement parts so that they can better service their customers.
由于别名是一种展开形式而不是替换，它使您可以继续向别名命令添加选项和参数。
Because the alias is an expansion and not a replacement, it enables you to continue adding options and arguments to an aliased command.
在运行命令时，您需要将斜体表示的文本替换为相应的值，否则就会获得错误和意外结果。
When running the commands, replace the italicized text with the appropriate value, or you'll get errors and unexpected results.
不同于绑定变量，替代变量在客户端加以处理，且其值会在提交执行命令之前被替换。
Unlike bind variables, a substitution variable is processed on the client side, and its value will be substituted before submitting the command for execution.
别名可以方便地配置一些命令以使用不同的默认值，或为某个命令提供可替换的名称。
Aliases are a handy way to configure some commands to use different sets of defaults or to provide an alternate name for a command.
相关扩展包括替换命令和针对不同进程重定向信息的更好方法。
Extensions include better ways of substituting commands and redirecting information in and out to different processes.
使用它可以很容易地接受命令的可替换版本，这样就具有了允许缩写和国际化等优点。
Alternate versions of commands are easily accepted, which has the benefit of allowing for abbreviations and internationalization, among other things.
关于这个问题的一个很明显的解决方案是去掉init命令的串行特性，将其替换成并行化操作。
An obvious solution to this problem is to remove the serial nature of the init command and replace it with something that operates more in parallel.
如果省略了text且不存在要替换的现有文本值，更新命令就会失败。
If text is omitted and there is no existing text value to replace, the update command fails.
通过ls命令比较文件的大小，您可以看到备份被用于替换当前的数据库。
Comparing the file sizes with the ls command, you see that the backup was used to replace the current database.
sprintf函数包含一个runmqsc命令模板，上述值将替换模板中的值。
The sprintf function contains a template of the runmqsc command into which values are substituted.
还可以使用模式、替换和sed从命令行更改文本。
You can also alter text from the command line using patterns, replace, and sed.
用下载获得的文件的名称替换上一命令中的cdrom . iso。
Substitute the filename you download for cdrom.iso in the previous command.
如果xargs将要执行的命令包含有替换字符串，那么将使用参数替换它。
Wherever the replacement string occurs in the command you ask xargs to execute, it will be replaced by an argument.
例如，“ ！ ”字符是历史扩展字符，bash通常将其替换为前面输入的命令。
For example, the "! "character is the history expansion character, which bash normally replaces with a previously-typed command.
通过使用s命令并替换一个空替换字符，您可以删除尾随空格。
You can remove trailing blanks from a file by using the s command and substituting a null replacement.
注意，在以上命令中必须替换终端类型png的truecolor选项，这会覆盖gnuplot使用的默认颜色。
Notice that in the above command I had to replace the truecolour option to the terminal type png, which overrides the default colors gnuplot uses.
注意，我们的命令被包含在双引号之间，因此将对 $ht 执行替换。
Note that our command is contained between double quotes (") so that substitution will occur for $ht.
在本文中，您将简要了解从文件和程序中获得文本、使用tr命令对其进行简单的转换、使用sed命令进行复杂的搜索和替换操作。
In this article, you'll take a quick look at getting text from files and programs, simple transliterations using the tr command, and complex search and replace actions using the sed command.
在第一个脚本中，我们使用s(替换)命令来将每一行中的小写‘a’替换为大写。
In the first one, we use the s (substitute) command to substitute an upper case for a lower case 'a' on each line.
以下示例使用CHANGE命令将令牌firstnm替换为 firstnme。
The example below replaces the token firstnm with firstnme using the CHANGE command.
应用推荐