/bin/sh -> ${stdenv.shell}

pkgs/build-support/docker/default.nix

···
     export PATH=${shadow}/bin:$PATH
     mkdir -p /etc/pam.d
     if [[ ! -f /etc/passwd ]]; then
-      echo "root:x:0:0::/root:/bin/sh" > /etc/passwd
+      echo "root:x:0:0::/root:${stdenv.shell}" > /etc/passwd
       echo "root:!x:::::::" > /etc/shadow
     fi
     if [[ ! -f /etc/group ]]; then

pkgs/build-support/release/ant-build.nix

···
 
       mkdir -p $out/bin
       cat >> $out/bin/${w.name} <<EOF
-      #! /bin/sh
+      #!${stdenv.shell}
       export JAVA_HOME=$jre
       $jre/bin/java ${cp w} ${if w ? mainClass then w.mainClass else "-jar ${w.jar}"} \$@
       EOF

pkgs/build-support/vm/windows/default.nix

···
+#note: the hardcoded /bin/sh is required for the VM's cygwin shell
 pkgs:
 
 let

pkgs/servers/nosql/eventstore/default.nix

···
     mkdir -p $out/{bin,lib/eventstore/clusternode}
     cp -r bin/clusternode/* $out/lib/eventstore/clusternode/
     cat > $out/bin/clusternode << EOF
-    #!/bin/sh
+    #!${stdenv.shell}
     exec ${mono}/bin/mono $out/lib/eventstore/clusternode/EventStore.ClusterNode.exe "\$@"
     EOF
     chmod +x $out/bin/clusternode

pkgs/servers/xmpp/pyIRCt/default.nix

···
     sed -e '/configFiles/iimport os' -i config.py
     cp * $out/share/${name}
     cat > $out/bin/pyIRCt <<EOF
-      #! /bin/sh
+      #!${stdenv.shell}
       cd $out/share/${name}
       ./irc.py \"$@\"
     EOF

pkgs/servers/xmpp/pyMAILt/default.nix

···
     sed -e '/configFiles/iimport os' -i config.py
     cp * $out/share/$name
     cat > $out/bin/pyMAILt <<EOF
-      #! /bin/sh
+      #!${stdenv.shell}
       cd $out/share/${name}
       ./mail.py \"$@\"
     EOF