Chopping off the last directory in a Makefile variable

Shell Programming and Scripting
1

Hi everybody,

I have a Makefile where I need to use an environment variable that I set, MYBUILDPATH. The variable can be different depending on the computer, but it always ends with /myBuildRoot/data_tables. Sometimes the data_tables directory will have a slash after it, sometimes not, depending on the computer.

What I'm trying to do is get the location of the build root from this variable (with a slash on the end), so something like this:

MYBUILDPATH=/randomstuff/myBuildRoot/data_tables
MYBUILDROOT=/randomstuff/myBuildRoot/

I've tried calling the shell from the Makefile:

I've tried a lot of things, including:

MYBUILDROOT=$(shell ${$$MYBUILDPATH%/data_tables})

And using sed, but no luck.

Would anyone mind pointing me in the right direction to figure this out? I'd appreciate any help.

Thanks,
Zel2008

2

There are different ways to achive this.
Try this for one:

$ MYBUILDPATH=/randomstuff/myBuildRoot/data_tables
$ echo $MYBUILDPATH | sed 's~data_tables[/]*$~~'

/randomstuff/myBuildRoot/

$ MYBUILDPATH=/randomstuff/myBuildRoot/data_tables/
$ echo $MYBUILDPATH | sed 's~data_tables[/]*$~~'

/randomstuff/myBuildRoot/
1 Like
3

Thank you edidataguy, that works perfectly! :slight_smile: