Document arguments passed via STDIN

README.md

@@ -90,8 +90,12 @@ if both passed all their tests. For example: if module A failed its tests, then
     zef -v install https://github.com/ugexe/zef/archive/main.tar.gz
     zef -v install https://github.com/ugexe/[email protected]
 
+    # STDIN
+    echo "Net::HTTP" | zef install -
+
 A request may contain any number and combination of these. Paths and URLs will be resolved first so they are available
-to fulfill any dependencies of other requested identities.
+to fulfill any dependencies of other requested identities. An identity of `-` will treat each line of STDIN as an
+identity.
 
 **Options**
 

lib/Zef/CLI.rakumod

@@ -135,7 +135,8 @@ package Zef::CLI {
             *@wants ($, *@)
         )
 
-    Fetch, extract, build, test, and install C<@wanted> distributions and their prerequisites.
+    Fetch, extract, build, test, and install C<@wanted> distributions and their prerequisites. If C<@wanted> contains a
+    value of C<-> then each line of STDIN will be added to C<@wanted>.
 
     If C<$fetch> is set to C<False> then the fetch phase will be skipped.