和sh、bash相似但不一样,下面看一下他们的区别: 1.sh filename重新建立一个子shell,在子shell中执行脚本里面的语句,该子shell继承父shell的环境变量,但子shell无论怎么改变变量都不会被带回父shell。 2.source filename这个命令其实只是简单地读取脚本里面的语句依次在当前shell里面执行,没有建立新的子
您可以以多种方式使用export。一个常见的例子是使用export来设置用户环境。用户可以简单地使用export指定变量并将它们添加到他们的.profile文件中。因此,每次用户登录时,环境都将按照这种方式配置。 1、显示export所有的变量 当不带任何参数使用时,export命令将显示环境中所有export变量的列表。您应该能够查看变量的名称及其...
Without any arguments, the command will generate or display all exported variables. Below is an example of the expected output. $ export Sample output Viewing all exported variables on current shell If you wish to view all exported variables on the current shell, use the-pflag as shown in the...
ccm users -exportfile Uses Use this command to administer users and roles in an external tool so that the data can be imported into another database, at the same Rational® Synergy, release using theccm users -importcommand. Options and arguments ...
and execute commands from filename in the current shell environment and return the exit status of the last command executed from filename.明白了为什么不一样了吧?直接执行一个脚本文件是在一个子shell中运行的,而source则是在当前shell环境中运行的。根据 ...
而命令export可以向后面的shell传递变量的值。当一个shell脚本调用并执行时,它不会自动得到原为脚本(调用者)里定义的变量的访问 权,除非这些变量已经被显式地设置为可用。export命令可以用于传递一个或多个变量的值到任何后继脚本。 ---《UNIX教程》
the bash export command is one of many built-in commands for UNIX systems. It is used to identify variables and functions to be added to child processes. Interestingly, the bash export command supports only three options. This built-in bash command is important because it updates a current sh...
The EXPORT command exports data from a database to one of several external file formats. The user specifies the data to be exported by supplying an SQL SELECT statement, or by providing hierarchical information for typed tables.
There are instances or situations where we would like to define a variable and it should be accessed in all the shells or processes invoked by the original shell. This can be achieved by theexportcommand in ksh/sh as shown below.
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