使文件回显显示“$PATH”细绳

发布于 2024-09-18 16:04:23 字数 441 浏览 8 评论 0原文

我试图强制 make 文件显示下一个字符串：

"Please execute next commands:
setenv PATH /usr/local/greenhills/mips5/linux86:$PATH"

问题出在 "$PATH" 上。命令

@echo "setenv PATH /usr/local/greenhills/mips5/linux86:$PATH"

导致结果

"setenv PATH /usr/local/greenhills/mips5/linux86:ATH"

转义字符、引号、"$(shell echo " 的任何组合都没有得到所需的结果...

有什么建议吗？

原文

I am trying to force make file to display next string:

"Please execute next commands:
setenv PATH /usr/local/greenhills/mips5/linux86:$PATH"

The problem is with "$PATH". Command

@echo "setenv PATH /usr/local/greenhills/mips5/linux86:$PATH"

cause a result

"setenv PATH /usr/local/greenhills/mips5/linux86:ATH"

any combinations of escape characters, quotes, "$(shell echo " didn't get required results...

Any suggestions?

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假情假意假温柔 2024-09-25 16:04:24

make 使用 $ 作为自己的变量扩展。例如，单字符变量 $A 或具有长名称的变量 - ${VAR} 和 $(VAR)。

要将 $ 放入命令中，请使用 $$，例如：

all:
  @echo "Please execute next commands:"
  @echo 'setenv PATH /usr/local/greenhills/mips5/linux86:$PATH'

另请注意，要 make "" 和 '' （双引号和单引号）不发挥任何作用，它们会逐字传递到 shell。（删除 @ 符号以查看 make 发送到 shell 的内容。）为了防止 shell 扩展 $PATH，第二行使用 ''。

The make uses the $ for its own variable expansions. E.g. single character variable $A or variable with a long name - ${VAR} and $(VAR).

To put the $ into a command, use the $$, for example:

all:
  @echo "Please execute next commands:"
  @echo 'setenv PATH /usr/local/greenhills/mips5/linux86:$PATH'

Also note that to make the "" and '' (double and single quoting) do not play any role and they are passed verbatim to the shell. (Remove the @ sign to see what make sends to shell.) To prevent the shell from expanding $PATH, second line uses the ''.

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腹黑女流氓 2024-09-25 16:04:24

棘手的

Makefile 片段 - 关于如何打印以及如何使用

CURRENTDIR =  $(shell pwd)
PARENTDIR = $(shell dirname $(CURRENTDIR))
#HOME =  ${HOME} No need of this
#PATH = ${PATH} or this

test:
    $(info  HOME is  $(value HOME) PATH is $(value PATH))
    $(info  HOME is  $(HOME) PATH is $(PATH))
    -$(shell unzip xx.zip -d $(HOME)/.local)
    $(export PATH := $(PATH):$(HOME)/.local/bin)

输出

make test

HOME is  /home/alex PATH is /home/alex/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/usr/lib/cuda/bin:/usr/local/go/bin
HOME is  /home/alex PATH is /home/alex/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/usr/lib/cuda/bin:/usr/local/go/bin

Tricky

Makefile snippet - on how to print and how to use

CURRENTDIR =  $(shell pwd)
PARENTDIR = $(shell dirname $(CURRENTDIR))
#HOME =  ${HOME} No need of this
#PATH = ${PATH} or this

test:
    $(info  HOME is  $(value HOME) PATH is $(value PATH))
    $(info  HOME is  $(HOME) PATH is $(PATH))
    -$(shell unzip xx.zip -d $(HOME)/.local)
    $(export PATH := $(PATH):$(HOME)/.local/bin)

Output

make test

HOME is  /home/alex PATH is /home/alex/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/usr/lib/cuda/bin:/usr/local/go/bin
HOME is  /home/alex PATH is /home/alex/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/usr/lib/cuda/bin:/usr/local/go/bin

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可爱暴击 2024-09-25 16:04:23

在 GNU make 手册中，他们在描述值函数：

值函数为您提供了一种使用 a 的值的方法
变量而不扩展它。请注意，这并不
撤消已经发生的扩展；例如，如果您创建
一个简单扩展的变量，其值在
定义;在这种情况下，值函数将返回相同的值
结果与直接使用变量相同。
值函数的语法为：
 $(值变量)
注意variable是变量的名称；不是对该变量的引用。因此你通常不会使用
写入时加“$”或括号。（但是，您可以使用
如果您不希望名称成为变量，则名称中包含变量引用
常数。）
该函数的结果是一个包含以下值的字符串
变量，不发生任何扩展。例如，在这个
生成文件：
<前><代码> FOO = $PATH
全部：
@回声$(FOO)
@echo $(值 FOO)
第一个输出行将是 ATH，因为“$P”将扩展为 make 变量，而第二个输出行将是 ATH
输出行将是 $PATH 环境的当前值
变量，因为值函数避免了扩展。

In the manual for GNU make, they talk about this specific example when describing the value function:

The value function provides a way for you to use the value of a
variable without having it expanded. Please note that this does not
undo expansions which have already occurred; for example if you create
a simply expanded variable its value is expanded during the
definition; in that case the value function will return the same
result as using the variable directly.
The syntax of the value function is:
 $(value variable)
Note that variable is the name of a variable; not a reference to that variable. Therefore you would not normally use
a ‘$’ or parentheses when writing it. (You can, however, use a
variable reference in the name if you want the name not to be a
constant.)
The result of this function is a string containing the value of
variable, without any expansion occurring. For example, in this
makefile:
 FOO = $PATH

 all:
         @echo $(FOO)
         @echo $(value FOO)
The first output line would be ATH, since the “$P” would be expanded as a make variable, while the second
output line would be the current value of your $PATH environment
variable, since the value function avoided the expansion.