It's there a way to start instances of
xterm using different configuration files. Ex:
xterm -load .Xresources-1,
xterm -load .Xresources-1
xrdb -load ~/.Xdefaults changes the configs globaly which I try to avoid.
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That's usually done by changing the instance name, which by default is the name of the program which is run, but can be overridden using the
-name option. (If you make a symbolic link to a program and run that link, that's a quick way of renaming a program as well).
If you have a resource file with settings like
the instance is the
xterm at the beginning of the line.
You can also change the class name (which you commonly see as
XTerm, also at the beginning of the resource lines). The
uxterm script uses the
-class option to override this to change settings to make
xterm work consistently in UTF-8 mode.
If you have different class names, then you can use the app-defaults search mechanism to support different resource files. I set the environment variable
XAPPLRESDIR to my own directory, and have locally-customized resource files (each named for a class). That is documented in X(7):
Directories named by the environment variable
XUSERFILESEARCHPATHor the environment variable
XAPPLRESDIR(which names a single directory and should end with a
'/'on POSIX systems), plus directories in a standard place (usually under
/tmp/Xorg-KEM/lib/X11/, but this can be overridden with the
XFILESEARCHPATHenvironment variable) are searched for for application-specific resources. For example, application default resources are usually kept in
/tmp/Xorg-KEM/lib/X11/app-defaults/. See the X Toolkit Intrinsics - C Language Interface manual for details.