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#************* Title of helpfile !! and start of real helpfile ********
TITLE		ARB environment variables

OCCURRENCE	Anywhere

DESCRIPTION     Arb is aware of several environment variables:

                    ARBHOME

                        Should be set to the arb install directory
                        (usually /usr/arb)

                    LD_LIBRARY_PATH

                        path to system libraries (should contain $ARBHOME/lib (i.e. /usr/arb/lib if $ARBHOME is /usr/arb)).
                        Set by the 'arb' script.
                        (Note: unused/does not work under OSX, because of SIP)


                    ARB_TEXTEDIT

                        The NAME (e.g. "gedit") of the editor you like to use
                        when editing textlike files via ARB
                        (used by script arb_textedit. auto-detected if undefined).

                        On macOS, it defaults to TextEdit.
                        If you have set a different default text editor for macOS and
                        want to use it with arb, too, set the environment variable to
                        'open -t'. If you want to use a specific app when opening text
                        files from within ARB, use 'open -a <app name>', e.g.
                        'open -a BBEdit' to open text files in BBEdit.


                    ARB_XTERM

                            The call which is needed to create a normal xterm
                            (default: xterm -sl 1000 -sb -geometry 150x60
                             Note: until arb-6.0.x geometry defaulted to "120x50")


                    ARB_XCMD

                            The call which is needed to create a xterm invoking external programs
                            (default: $ARB_XTERM -e ).

                    USER

                            your username (normally set by shell).

                    PRINTER

                            if PRINTER is defined, it may contain the name of your printer. ARB will
                            then automatically use it in the printer command.

                    ARB_PID

                            internal PID for communication (set by the 'arb' script)

                    ARBMACRO

                            directory name where global ARB-macros may be provides by system administrator
                            (default: $ARBHOME/lib/macros )

                    ARB_PROP

                            directory name where your local ARB-properties will be saved to/loaded from
                            (default: $HOME/.arb_prop ).
                            Allows to use different ARB configurations in the same user account.

                    ARBMACROHOME

                            directory name where your local ARB-macros will be saved to/loaded from
                            (default: $ARB_PROP/macros )

                    ARBCONFIG

                            directory name where your local ARB-configs will be saved to/loaded from
                            (default: $ARB_PROP/cfgSave )

                    ARB_GS

                            name of postscript viewer used by ARB
                            (default: 'xreader' or 'gv' or 'ghostview'on Linux, 'open -W' on macOS).

                            If you want to use a different app to open postscript files on macOS from within ARB,
                            use 'open -W -a <app name>', e.g. 'open -a "Affinity Designer"' to open postscript
                            files in Affinity designer. Please make sure that you add the -W option to the open
                            command. Otherwise, arb might delete the file before the other program reads it.

                    ARB_PDFVIEW

                            name of pdf viewer used by ARB
                            (default: 'xreader' or 'epdfview' or 'acroread' or 'gv' on Linux, 'open -W' on macOS).

                            If you want to use a different app to open postscript files on macOS from within ARB,
                            use 'open -W -a <app name>', e.g. 'open -a "Affinity Designer"' to open postscript
                            files in Affinity designer. Please make sure that you add the -W option to the open command.
                            Otherwise, arb might delete the file before the other program reads it.

                    ARB_WORKDIR

                            extra directory appearing in ARB-File-Browsers
                            (default: none)

                    ARB_DOC

                            directory where ARB searches for *.ps, *.ps.gz, *.pdf
                            and *.pdf.gz (default: $ARBHOME/lib/help)

                    ARB_HTMLDOC

                            directory where ARB searches for *.html help files
                            (default: $ARBHOME/lib/help_html)

NOTES		Short description of how to set an environment variable:

                        1. for bash users (add to .bashrc):

                           ARB_GS='my_special_postscript_viewer'
                           export  ARB_GS

                        2. for tcsh users (add to .cshrc):

                           setenv ARB_GS 'my_special_postscript_viewer'

                If you are using OSX please also refer to
                LINK{https://github.com/arb-project/homebrew-arb#configuration}

EXAMPLES	None

WARNINGS	None

BUGS		No bugs known