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Questions tagged [variable-expansion]

Evaluating or expanding a variable to get its value. Depending on the language, a variable may be expanded one or more times.

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Variable expansion in Makefiles

Make seems to be expanding variables only after a rule is active. make ok displays the resolved NAME (ie. "test") make bad claims to depend on "grep" (rather than "test") How can I get make to expand NAME before it checks the dependencies of the…
BlueChip
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Expanding var names of __VA_ARGS__ in C++ preprocessor macro

I'm trying to implement a proper enum to str macro which would automatise the association between enum values and their name in the code. For example I'd like to define a new macro called "Test" like this: ENUM_STR_DECLARE(Test, 1, test1, test2,…
nadrino
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How to pass multiple arguments including arrays to a function in Bash where order is not defined and array elements can have multiple words?

I'm for hours trying to figure this one out. What I would like to do is have a function that can receive N parameters which can include arrays. Arrays can be in any parameter position, not only the last! Order of parameters can change, for example,…
user5507535
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ExpandString breaks EOL

Context I have a multi line file named DEV.properties. It contains references to ENV variables ACTIVEMQ_DB_USERNAME=${ACTIVEMQ_DB_USERNAME} I am writing a ps script to replace this file with one populated with the relevant variables Problem Here is…
zar3bski
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get literal value of bash variable, without glob expansions or other changes

I have a folder with some xml files in it: 1.xml, 2.xml and so on. Then i am doing: a=*.xml echo $a I am getting list of these xml files like this: 1.xml 2.xml But then i am doing a=*.qwe echo $a I am getting literal value of a: *.qwe Then I am…
ilya
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PowerShell string format different behaviour within function

While using powershell I struggle to build up a filename from two variables. When I originally creaded the powershell script, it was working fine. Now I have tried to move some repeatable steps into a function, but the string behaviour is…
Crumar
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batch file setlocal confusion

I am having difficulty understanding how batch file localization works. Here is an example to demonstrate my confusion @echo off set x=5 set y=1 setlocal enabledelayedexpansion if %y% GEQ 1 ( set x=6 echo %x% echo !x! ) echo…
danny
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Can a variable expansion in python work like shell expansion of variable

I have a legacy python code that reads from a shell script for variable values like in a properties file. For example, say, I have a shell program x.sh for variable declaration…
Dr. Debasish Jana
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Bash 4.4 fails autocomplete environment variable for "more" but not "less" or "cd"

I am working on a server that runs Ubuntu 18 and bash 4.4, and I have problem with autocompletion and expanding paths stored in environment variable, but only if I use the "more" command: $ echo $TEST_DIR $ export…
Yehudit Hasin
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Bash variable expansion

I have a string made up of directories with a space after each one dirs="/home /home/a /home/b /home/a/b/c" the following code deletes the last directory in the string. dirs=${dirs% * } This works in all cases except when only one directory is…
DanielST
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$(file < $@) expands to nothing but it should not

I wrote this make rule $(COMPDIR)/%.d: $(COMPDIR)/%.cpp # other code... $(file > $@,$(foreach path,$(file < $@),$(shell echo "$(path)" | sed 's!$(SRCDIR)/!$(COMPDIR)/!'))) # other code... This should read the target file $@, tokenize its…
qub1750ul
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Bash - Expanding a variable into another variable name

Let's say I have these variables: VAR_A=resultA VAR_B=resultB X=A I want to get the value of VAR_A or VAR_B based on the value of X. This is working and gives resultA: VAR="VAR_$X" RESULT=${!VAR} My question is, is there a one-liner for this?…
scandel
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how to expand expression string in powershell

is there any comlet like expand-string? $a="ab cd" $command = 'dir $a' Write-Host (expand-string $command) expected: dir abcd Note, I know I can just use $command="dir $a" to expand the string, but that was not I want to, I need to save the string…
xinglong
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Write a user supplied command to file

I need to write a user supplied command to a file with bash. Testcase would be script.sh -- echo "Hello \$USER" and I want a file containing echo "Hello $USER" (or echo Hello\ $USER) which can be executed I'm using heredoc to write to the file, so…
Flamefire
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Wrong expansion of variable in Makefile.am

I am stuck with a strange variable expansion. Let me explain. I have a project that uses automake, composed by configure.ac, Makefile.am. Basically, in Makefile.am I'm doing: ARCH = $(shell ${CURDIR}/./arch.sh) ... noinst_HEADERS =…
Kyrol
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