diff --git a/src/testdir/Make_amiga.mak b/src/testdir/Make_amiga.mak
index 901a7c1..af27919 100644
--- a/src/testdir/Make_amiga.mak
+++ b/src/testdir/Make_amiga.mak
@@ -41,6 +41,7 @@
 		test_autocmd_option.out \
 		test_autoformat_join.out \
 		test_breakindent.out \
+		test_cdo.out \
 		test_changelist.out \
 		test_charsearch.out \
 		test_close_count.out \
@@ -195,6 +196,7 @@
 test_autocmd_option.out: test_autocmd_option.in
 test_autoformat_join.out: test_autoformat_join.in
 test_breakindent.out: test_breakindent.in
+test_cdo.out: test_cdo.in
 test_changelist.out: test_changelist.in
 test_charsearch.out: test_charsearch.in
 test_close_count.out: test_close_count.in
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 603f4a4..abef950 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -40,6 +40,7 @@
 		test_autocmd_option.out \
 		test_autoformat_join.out \
 		test_breakindent.out \
+		test_cdo.out \
 		test_changelist.out \
 		test_charsearch.out \
 		test_close_count.out \
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 1b76bcc..aa59a01 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -62,6 +62,7 @@
 		test_autocmd_option.out \
 		test_autoformat_join.out \
 		test_breakindent.out \
+		test_cdo.out \
 		test_changelist.out \
 		test_charsearch.out \
 		test_close_count.out \
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index 08f78cb..9150af7 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -42,6 +42,7 @@
 		test_autocmd_option.out \
 		test_autoformat_join.out \
 		test_breakindent.out \
+		test_cdo.out \
 		test_changelist.out \
 		test_charsearch.out \
 		test_close_count.out \
diff --git a/src/testdir/Make_vms.mms b/src/testdir/Make_vms.mms
index 6e77153..a716d03 100644
--- a/src/testdir/Make_vms.mms
+++ b/src/testdir/Make_vms.mms
@@ -4,7 +4,7 @@
 # Authors:	Zoltan Arpadffy, <arpadffy@polarhome.com>
 #		Sandor Kopanyi,  <sandor.kopanyi@mailbox.hu>
 #
-# Last change:  2015 Sep 01
+# Last change:  2015 Sep 08
 #
 # This has been tested on VMS 6.2 to 8.3 on DEC Alpha, VAX and IA64.
 # Edit the lines in the Configuration section below to select.
@@ -101,6 +101,7 @@
 	 test_autocmd_option.out \
 	 test_autoformat_join.out \
 	 test_breakindent.out \
+	 test_cdo.out \
 	 test_changelist.out \
 	 test_charsearch.out \
 	 test_close_count.out \
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index f29ec8b..39d8388 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -38,6 +38,7 @@
 		test_autocmd_option.out \
 		test_autoformat_join.out \
 		test_breakindent.out \
+		test_cdo.out \
 		test_changelist.out \
 		test_charsearch.out \
 		test_close_count.out \
diff --git a/src/testdir/test_cdo.in b/src/testdir/test_cdo.in
new file mode 100644
index 0000000..fb80ea1
--- /dev/null
+++ b/src/testdir/test_cdo.in
@@ -0,0 +1,107 @@
+Tests for the :cdo, :cfdo, :ldo and :lfdo commands
+
+STARTTEST
+:so small.vim
+:if !has('quickfix') | e! test.ok | wq! test.out | endif
+
+:call writefile(["Line1", "Line2", "Line3"], 'Xtestfile1')
+:call writefile(["Line1", "Line2", "Line3"], 'Xtestfile2')
+:call writefile(["Line1", "Line2", "Line3"], 'Xtestfile3')
+
+:function RunTests(cchar)
+:  let nl="\n"
+
+:  enew
+:  " Try with an empty list
+:  exe a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " Populate the list and then try
+:  exe a:cchar . "getexpr ['non-error 1', 'Xtestfile1:1:3:Line1', 'non-error 2', 'Xtestfile2:2:2:Line2', 'non-error 3', 'Xtestfile3:3:1:Line3']"
+:  exe a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " Run command only on selected error lines
+:  enew
+:  exe "2,3" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  " Boundary condition tests
+:  enew
+:  exe "1,1" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  enew
+:  exe "3" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  " Range test commands
+:  enew
+:  exe "%" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  enew
+:  exe "1,$" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  enew
+:  exe a:cchar . 'prev'
+:  exe "." . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  " Invalid error lines test
+:  enew
+:  exe "27" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "4,5" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " Run commands from an unsaved buffer
+:  let v:errmsg=''
+:  enew
+:  setlocal modified
+:  exe "2,2" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  if v:errmsg =~# 'No write since last change'
+:     let g:result .= 'Unsaved file change test passed' . nl
+:  else
+:     let g:result .= 'Unsaved file change test failed' . nl
+:  endif
+
+:  " If the executed command fails, then the operation should be aborted
+:  enew!
+:  let subst_count = 0
+:  exe a:cchar . "do s/Line/xLine/ | let subst_count += 1"
+:  if subst_count == 1 && getline('.') == 'xLine1'
+:     let g:result .= 'Abort command on error test passed' . nl
+:  else
+:     let g:result .= 'Abort command on error test failed' . nl
+:  endif
+
+:  exe "2,2" . a:cchar . "do! let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " List with no valid error entries
+:  edit! +2 Xtestfile1
+:  exe a:cchar . "getexpr ['non-error 1', 'non-error 2', 'non-error 3']"
+:  exe a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "2" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  let v:errmsg=''
+:  exe "%" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "1,$" . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "." . a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  let g:result .= v:errmsg
+
+:  " List with only one valid entry
+:  exe a:cchar . "getexpr ['Xtestfile3:3:1:Line3']"
+:  exe a:cchar . "do let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " Tests for :cfdo and :lfdo commands
+:  exe a:cchar . "getexpr ['non-error 1', 'Xtestfile1:1:3:Line1', 'Xtestfile1:2:1:Line2', 'non-error 2', 'Xtestfile2:2:2:Line2', 'non-error 3', 'Xtestfile3:2:3:Line2', 'Xtestfile3:3:1:Line3']"
+:  exe a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "3" . a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "2,3" . a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "%" . a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe "1,$" . a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:  exe a:cchar . 'pfile'
+:  exe "." . a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+
+:  " List with only one valid entry
+:  exe a:cchar . "getexpr ['Xtestfile2:2:5:Line2']"
+:  exe a:cchar . "fdo let g:result .= expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C' . nl"
+:endfunction
+
+:let result=''
+:" Tests for the :cdo quickfix list command
+:call RunTests('c')
+:let result .= "\n"
+:" Tests for the :ldo location list command
+:call RunTests('l')
+
+:edit! test.out
+:0put =result
+:wq!
+ENDTEST
+
diff --git a/src/testdir/test_cdo.ok b/src/testdir/test_cdo.ok
new file mode 100644
index 0000000..ddcff4b
--- /dev/null
+++ b/src/testdir/test_cdo.ok
@@ -0,0 +1,66 @@
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile2 2L 2C
+Unsaved file change test passed
+Abort command on error test passed
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile3 2L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile2 2L 2C
+Xtestfile2 2L 5C
+
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile2 2L 2C
+Unsaved file change test passed
+Abort command on error test passed
+Xtestfile2 2L 2C
+Xtestfile3 3L 1C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile3 2L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile1 1L 3C
+Xtestfile2 2L 2C
+Xtestfile3 2L 3C
+Xtestfile2 2L 2C
+Xtestfile2 2L 5C
+