Linux 在 csh 中设置环境变量
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Setting an environment variable in csh
提问by alwbtc
I have the following line at the first line in my script file:
我的脚本文件的第一行有以下行：
#!/bin/sh
So I'm using csh.(?)
所以我正在使用 csh。（？）
I wanto assign the output of the following to an environment variable:
我想将以下内容的输出分配给环境变量：
echo $MYUSR | awk '{print substr(set $MYVAR = echo $MYUSR | awk '{print substr( #!/bin/csh
set MYVAR = `echo $MYUSR | awk '{print substr( ls -l /bin/sh /bin/bash
,4)}'`
echo $MYVAR
,4)}'
,4)}'
I try:
我尝试：
MYVAR=$(echo $MYUSR | awk '{print substr( MYVAR=``echo $MYUSR | awk '{print substr(MYVAR=`echo $MYUSR | awk ...`
,4)}``
echo $MYVAR
# arg!! only one pair of enclosing back-ticks needed,
# can't find the secret escape codes to make this look exactly right.
,4)}')
echo $MYVAR
But it doesn't work, How can I do it? I want to do it in a sh file.
但它不起作用，我该怎么办？我想在 sh 文件中进行。
采纳答案by shellter
Your script should look like
你的脚本应该看起来像
#!/bin/csh
I don't have a way to test this right now, let me now if it doesn't work.
我现在没有办法测试这个，如果它不起作用，让我现在。
If you've inherited the basis of your script from someone else, with the #!/bin/sh,
then you have to find out if /bin/sh is really the bourne shell, or if it is a link to /bin/bash
如果你从其他人那里继承了你的脚本的基础#!/bin/sh，那么你必须找出 /bin/sh 是否真的是 bourne shell，或者它是否是 /bin/bash 的链接
You can tell that by doing
你可以通过这样做来判断
MYVAR=`echo $MYUSR | awk '{print substr(MYVAR=`echo $MYUSR | awk '{print substr(##代码##,4)}`
echo $MYVAR
,4)}`
echo $MYVAR
if you get back information on files where the size is exactly the same, the you're really using bash, but called as /bin/sh
如果您获得有关大小完全相同的文件的信息，则您实际上是在使用 bash，但称为 /bin/sh
So try these 2 solutions
所以试试这两个解决方案
##代码##AND
和
##代码##in all cases (csh) included, the back-ticks AND the $( ... )are known as command substitution.
What every output comes from running the command inside, is substituted into the command line AND then the whole command is executed.
在所有情况下 (csh) 包括在内，反引号和$( ... )被称为命令替换。内部运行命令的每个输出都被替换到命令行中，然后执行整个命令。
I hope this helps.
我希望这有帮助。
回答by dldnh
if it's /bin/shit's bourne shell or bash, and use back quotes to execute something and this to assign that...
如果它是/bin/shbourne shell 或 bash，并使用反引号来执行某些内容，然后将其分配给...
回答by John Retterer
That script first line indicates that it should be interpreted by the Bourne shell (sh), not csh. Change it to
该脚本的第一行表明它应该由 Bourne shell (sh) 而不是 csh 来解释。将其更改为
##代码##回答by mtk
The first line of your code shows clearly you are not using a csh. You are using a plain shenvironment/shell. You have 2 options:
代码的第一行清楚地表明您没有使用csh. 您正在使用普通sh环境/外壳。您有 2 个选择：
- Either change the first line to
#!/bin/cshOR Keeping first line unchanged, update the code for setting the variable.
##代码##
- 将第一行更改为
#!/bin/cshOR 保持第一行不变，更新设置变量的代码。
##代码##
Let me know, if you get any error.
让我知道，如果你有任何错误。
