ZyX wrote: > If I do > > vim -u NONE -c 'unlet $PATH' > > I get “E488: Trailing characters” error. > > That means that there is no way to get rid of environment variable > after it was set which may be essential if tools using variables check > for their existence, not for their contents (e.g. in tcsh scripts > checking for emptyness and for existence are different constructs and > they are rarely checked both (and non-existent variables expand to > errors, not to empty values), it is also not uncommon to write “if > 'VARNAME' in os.environ:” or use EAFP principle in python in which > cases empty string is treated just like any other value).
Historically environment variables cannot be deleted, only made empty. It's not a good idea to check for existence, check for it being non-empty instead. Note that Vim will consider a non-existing environment variable to be empty, it doesn't give an error for ":let s = $ASDFASDF". -- hundred-and-one symptoms of being an internet addict: 248. You sign your letters with your e-mail address instead of your name. /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\ /// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\ \\\ an exciting new programming language -- http://www.Zimbu.org /// \\\ help me help AIDS victims -- http://ICCF-Holland.org /// -- -- You received this message from the "vim_dev" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
