Examples of using Shell variable in English and their translations into Chinese
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What is a Shell variable?
什么是Shell变量?Shell variables and programs.
Shell变量及编程.What Are Shell Variables?
什么是Shell变量?The$ is a shell variable.
Md是一个shell变量。In Linux, the dollar sign($) stands for a shell variable.
在Linux下，美元符号（$）后面跟着的是shell变量；.Using Shell Variables and Quoting.
Shell变量引用和字符串处理.The exit code of the previous command is stored in the shell variable$?
之前执行命令的退出状态码存储在外壳变量'$?Read-only shell variables cannot be unset.
只读shell变量不能被unset。PYTHONPATH(a list of directory names, with the same syntax as the shell variable PATH).
PYTHONPATH，这是个目录名字的列表，和shell变量PATH一样的语法。There are shell variables and environment variables. .
Shell变量有局部变量、环境变量之分。For example, the following creates a shell variable and then prints it:.
例如，以下内容创建一个Shell变量，然后将其打印出来：.Shell variables store the value of a string or a number for the shell to read.
Shell变量存储要读取的Shell的字符串或数字的值.This has the same syntax as the shell variable PATH, that is, a list of directory names.
(这和shell变量PATH具有一样的语法，即一系列目录名的列表)。PYTHONPATH(a list of directory names, with the same syntax as the shell variable PATH).
PYTHONPATH（一个包含目录名的列表，与shell变量PATH的语法相同）。It unsets a shell variable, removing it from memory and the shell's exported environment.
它可以取消设置一个shell变量，从内存和shell的导出环境中删除它。PYTHONPATH(a list of directory names, with the same syntax as the shell variable PATH).
PYTHONPATH*（一个包含目录名称的列表，它和shell变量*PATH*有一样的语法）。Similarly, Shell variables are used to store information and they can by the shell only.
类似地，Shell变量用于存储信息，它们只能由Shell来使用。Most often single quotes are used,to avoid having the shell interpret$ as a shell variable.
大多数情况下，使用单引号是为了避免shell将$解释为shell变量。Unix-type shells support two kinds of variables: shell variables and environment variables. .
这些配置文件包含两组不同的变量：shell变量和环境变量。Standard UNIX variables are split into two categories,environment variables and shell variables.
标准的UNIX变量分为两类，环境变量和shell变量。In broad terms, shell variables apply only to the current instance of the shell and are used to set short-term working conditions;
笼统地讲，shell变量只作用于当前shell实例而且常用于设置短期活动的环境；.The default secondary prompt isgt;(the greater than sign),but can be changed by re-defining the PS2 shell variable-.
默认的次级提示gt;（大于号），但可以改变重新定义PS2shell变量：.Each time the shell variables home, user and term are changed, the corresponding environment variables HOME, USER and TERM receive the same values.
每当修改shell变量的home,user和term时，对应的环境变量HOME,USER和TERM会接收相同的值。You can also learn about Korn shell scripting(June 2008)and Tcsh shell variables(August 2008).
您也可以查阅KornShell脚本（2008年6月）和tcshshell变量（2008年8月）。For example, to change the number of shell commands saved in the history list,you need to set the shell variable history.
举个例子，为了修改保存历史命令的数量，你需要设置shell变量history。Double quotes are used, such as"s/$1/$2/g", to allow the shell to substitute for a command line argument orother shell variable.
使用双引号，如"s/$1/$2/g"，是为了让shell替换命令行参数或其他shell变量。
