add $pipestatus support

tests/pipestatus.err

@@ -0,0 +1,12 @@
+
+####################
+# pipestatus variable - builtins only
+
+####################
+# pipestatus variable - no builtins
+
+####################
+# pipestatus variable - mixed
+
+####################
+# pipestatus variable - non-pipe

tests/pipestatus.in

@@ -0,0 +1,67 @@
+logmsg "pipestatus variable - builtins only"
+
+false | false | false; echo $pipestatus
+false | false | false; echo $status
+
+true | true | true; echo $pipestatus
+true | true | true; echo $status
+
+false | true | false; echo $pipestatus
+false | true | false; echo $status
+
+true | false | true; echo $pipestatus
+true | false | true; echo $status
+
+logmsg "pipestatus variable - no builtins"
+
+command false | command false | command false; echo $pipestatus
+command false | command false | command false; echo $status
+
+command true | command true | command true; echo $pipestatus
+command true | command true | command true; echo $status
+
+command false | command true | command false; echo $pipestatus
+command false | command true | command false; echo $status
+
+command true | command false | command true; echo $pipestatus
+command true | command false | command true; echo $status
+
+logmsg "pipestatus variable - mixed"
+
+command false | command false | false; echo $pipestatus
+command false | command false |  false; echo $status
+
+command true | true | command true; echo $pipestatus
+command true | true | command true; echo $status
+
+false | command true | command false; echo $pipestatus
+false | command true | command false; echo $status
+
+true | false | command true; echo $pipestatus
+true | false | command true; echo $status
+
+sh -c 'exit 5' | sh -c 'exit 2'; echo $pipestatus
+sh -c 'exit 5' | sh -c 'exit 2'; echo $status
+
+sh -c 'exit 3' | false | sh -c 'exit 6'; echo $pipestatus
+sh -c 'exit 3' | false | sh -c 'exit 6'; echo $status
+
+sh -c 'exit 9' | true | sh -c 'exit 3' | false; echo $pipestatus
+sh -c 'exit 9' | true | sh -c 'exit 3' | false; echo $status
+
+logmsg "pipestatus variable - non-pipe"
+
+true; echo $pipestatus
+true; echo $status
+
+false; echo $pipestatus
+false; echo $status
+
+command true; echo $pipestatus
+command true; echo $status
+
+command false; echo $pipestatus
+command false; echo $status
+
+sh -c 'exit 4'; echo $pipestatus
+sh -c 'exit 4'; echo $status

tests/pipestatus.out

@@ -0,0 +1,52 @@
+
+####################
+# pipestatus variable - builtins only
+1 1 1
+1
+0 0 0
+0
+1 0 1
+1
+0 1 0
+0
+
+####################
+# pipestatus variable - no builtins
+1 1 1
+1
+0 0 0
+0
+1 0 1
+1
+0 1 0
+0
+
+####################
+# pipestatus variable - mixed
+1 1 1
+1
+0 0 0
+0
+1 0 1
+1
+0 1 0
+0
+5 2
+2
+3 1 6
+6
+9 0 3 1
+1
+
+####################
+# pipestatus variable - non-pipe
+0
+0
+1
+1
+0
+0
+1
+1
+4
+4