[patch #6474] Issue warning if recursively searching stdin

[Eric Blake]

Follow-up Comment #6, patch #6474 (project grep):

No.  You want to expand:

$ grp XXX

into

$ GREP_OPTIONS=-r grep --exclude-dir...

Notice that this is a one-shot environment modification, for just the grep
process.  Don't believe me?  Try this:

$ export foo=bar
$ env | grep ^foo
$ foo=blah env | grep ^foo
$ env | grep ^foo

and notice how setting an env-var immediately before the command name is a
one-shot modification of the environment seen by just that command.

You may also want to note that the bash manual recommends shell functions
rather than aliases, as in:

grp() {
  GREP_OPTIONS=-r grep --exclude-dir=... "$@"
}


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