diff --git a/docs/utils.md b/docs/utils.md
index 16bbb047..b27cdafa 100644
--- a/docs/utils.md
+++ b/docs/utils.md
@@ -294,6 +294,21 @@ TOTAL           6823        774888      67232740
 
 Utility to print an inventory of satellite data by platform and instrument type.
 
+<pre>
+Usage:
+
+   sinv satbufrfile [tabledir]
+
+     where:
+
+       satbufrfile  [path/]name of BUFR satellite data file to be decoded
+
+       tabledir     [path/]name of directory containing master BUFR tables.
+                    If unspecified, the default directory location is
+                    the defined value of the MASTER_TABLE_DIR macro when the
+                    utility was built.
+</pre>
+
 See the source code at sinv.F90
 
 Sample output for: `sinv gdas.20200812/00/gdas.t00z.satwnd.tm00.bufr_d`
diff --git a/src/dxtable.F90 b/src/dxtable.F90
index 44b90cd5..f19d9ed9 100644
--- a/src/dxtable.F90
+++ b/src/dxtable.F90
@@ -641,9 +641,7 @@ subroutine dxinit(lun,ioi)
   enddo
 
   ntbb(lun) = 0
-  do i=1,ntbb(0)
-    tabb(i,lun) = ' '
-  enddo
+  tabb(1:ntbb(0),lun) = ' '
 
   ntbd(lun) = 0
   do i=1,ntbd(0)
@@ -713,9 +711,7 @@ subroutine dxmini(mbay,mbyt,mb4,mba,mbb,mbd)
   ! Initialize the message
 
   mbit = 0
-  do i=1,mxmsgld4
-    mbay(i) = 0
-  enddo
+  mbay(1:mxmsgld4) = 0
 
   ! For DX table messages, the Section 1 date is simply zeroed out.  Note that there is logic in function idxmsg()
   ! which relies on this.
diff --git a/src/jumplink.F90 b/src/jumplink.F90
index 94015d27..366b06e3 100644
--- a/src/jumplink.F90
+++ b/src/jumplink.F90
@@ -34,7 +34,7 @@ subroutine makestab
 
   implicit none
 
-  integer iprt, lunit, lundx, lun, lum, k, n, itba, inc, newn, noda, node, inod, icmpdx, ishrdx
+  integer iprt, lunit, lundx, lun, lum, n, itba, inc, newn, noda, node, inod, icmpdx, ishrdx
 
   character*128 bort_str, errstr
   character*8 nemo
@@ -206,9 +206,7 @@ subroutine makestab
   ! Set up expansion segments for type 'SUB', 'DRP', and 'DRS' nodes.
 
   newn = 0
-  do k=1,maxjl
-    knt(k) = 0
-  enddo
+  knt(1:maxjl) = 0
   do n=1,ntab
     iseq(n,1) = 0
     iseq(n,2) = 0
diff --git a/src/memmsgs.F90 b/src/memmsgs.F90
index 5b6431aa..bbaa3288 100644
--- a/src/memmsgs.F90
+++ b/src/memmsgs.F90
@@ -1119,7 +1119,7 @@ recursive subroutine ufbtam(tab,i1,i2,iret,str)
   integer*8 mps, ival
   integer, intent(in) :: i1, i2
   integer, intent(out) :: iret
-  integer iprt, maxtg, nnod, ncon, nods, nodc, ivls, kons, my_i1, my_i2, i, j, irec, isub, itbl, lun, il, im, jdate, mret, &
+  integer iprt, maxtg, nnod, ncon, nods, nodc, ivls, kons, my_i1, my_i2, i, irec, isub, itbl, lun, il, im, jdate, mret, &
     kbit, mbit, nbit, n, node, imsg, kmsg, nrep, ntg, nbyt, nbmp, nmsub
 
   real*8, intent(out) :: tab(i1,i2)
@@ -1153,11 +1153,7 @@ recursive subroutine ufbtam(tab,i1,i2,iret,str)
 
   if(msgp(0)==0) return
 
-  do j=1,i2
-    do i=1,i1
-      tab(i,j) = bmiss
-    enddo
-  enddo
+  tab(1:i1,1:i2) = bmiss
 
   ! Check for special tags in string
 
diff --git a/src/openclosebf.F90 b/src/openclosebf.F90
index d7f2523c..506d44ad 100644
--- a/src/openclosebf.F90
+++ b/src/openclosebf.F90
@@ -874,7 +874,7 @@ recursive subroutine ufbtab(lunin,tab,i1,i2,iret,str)
   integer, intent(in) :: lunin, i1, i2
   integer, intent(out) :: iret
   integer, parameter :: maxtg = 100
-  integer nnod, ncon, nods, nodc, ivls, kons, iprt, my_lunin, my_i1, my_i2, lunit, lun, il, im, irec, isub, i, j, n, ntg, &
+  integer nnod, ncon, nods, nodc, ivls, kons, iprt, my_lunin, my_i1, my_i2, lunit, lun, il, im, irec, isub, i, n, ntg, &
     jdate, jbit, kbit, lbit, mbit, nbit, nibit, nbyt, nsb, node, nbmp, nrep, lret, linc, iac_prev, ityp, &
     ireadmg, ireadsb, nmsub
 
@@ -927,11 +927,7 @@ recursive subroutine ufbtab(lunin,tab,i1,i2,iret,str)
   endif
 
   ! Initialize all of the output array values to the current value for "missing"
-  do j=1,i2
-    do i=1,i1
-      tab(i,j) = bmiss
-    enddo
-  enddo
+  tab(1:i1,1:i2) = bmiss
 
   ! Set counters to zero
   iret = 0
diff --git a/src/readwritesb.F90 b/src/readwritesb.F90
index 3715438c..5c9eac34 100644
--- a/src/readwritesb.F90
+++ b/src/readwritesb.F90
@@ -1183,10 +1183,7 @@ subroutine rcstpl(lun,iret)
   mbmp = 1
   nval(lun) = 1
   nr = 0
-
-  do i=1,maxrcr
-    knx(i) = 0
-  enddo
+  knx(1:maxrcr) = 0
 
   outer: do while (.true.)
 
diff --git a/src/readwriteval.F90 b/src/readwriteval.F90
index 2077542a..cefaa74d 100644
--- a/src/readwriteval.F90
+++ b/src/readwriteval.F90
@@ -658,7 +658,7 @@ recursive subroutine ufbint(lunin,usr,i1,i2,iret,str)
 
   integer, intent(in) :: lunin, i1, i2
   integer, intent(out) :: iret
-  integer iprt, nnod, ncon, nods, nodc, ivls, kons, ifirst1, ifirst2, my_lunin, my_i1, my_i2, lunit, lun, il, im, io, i, j
+  integer iprt, nnod, ncon, nods, nodc, ivls, kons, ifirst1, ifirst2, my_lunin, my_i1, my_i2, lunit, lun, il, im, io
 
   common /usrstr/ nnod, ncon, nods(20), nodc(10), ivls(10), kons(10)
   common /quiet/ iprt
@@ -728,13 +728,7 @@ recursive subroutine ufbint(lunin,usr,i1,i2,iret,str)
   call string(str,lun,i1,io)
 
   ! Initialize usr array preceeding an input operation
-  if(io==0) then
-    do j=1,i2
-      do i=1,I1
-        usr(i,j) = bmiss
-      enddo
-    enddo
-  endif
+  if(io==0) usr(1:i1,1:i2) = bmiss
 
   ! Call the mnemonic reader/writer
   call ufbrw(lun,usr,i1,i2,io,iret)
@@ -898,7 +892,7 @@ recursive subroutine ufbrep(lunin,usr,i1,i2,iret,str)
 
   integer, intent(in) :: lunin, i1, i2
   integer, intent(out) :: iret
-  integer iprt, ifirst1, my_lunin, my_i1, my_i2, lunit, lun, il, im, io, iac_prev, i, j
+  integer iprt, ifirst1, my_lunin, my_i1, my_i2, lunit, lun, il, im, io, iac_prev
 
   common /quiet/ iprt
 
@@ -964,13 +958,7 @@ recursive subroutine ufbrep(lunin,usr,i1,i2,iret,str)
   endif
 
   ! Initialize usr array preceeding an input operation
-  if(io==0) then
-    do j=1,i2
-      do i=1,i1
-        usr(i,j) = bmiss
-      enddo
-    enddo
-  endif
+  if(io==0) usr(1:i1,1:i2) = bmiss
 
   ! Parse or recall the input string
   iac_prev = iac
@@ -1111,7 +1099,7 @@ recursive subroutine ufbstp(lunin,usr,i1,i2,iret,str)
 
   integer, intent(in) :: lunin, i1, i2
   integer, intent(out) :: iret
-  integer iprt, ifirst1, my_lunin, my_i1, my_i2, lunit, lun, il, im, io, i, j
+  integer iprt, ifirst1, my_lunin, my_i1, my_i2, lunit, lun, il, im, io
 
   common /quiet/ iprt
 
@@ -1177,13 +1165,7 @@ recursive subroutine ufbstp(lunin,usr,i1,i2,iret,str)
   endif
 
   ! Initialize usr array preceeding an input operation
-  if(io==0) then
-    do j=1,i2
-      do i=1,I1
-        usr(i,j) = bmiss
-      enddo
-    enddo
-  endif
+  if(io==0) usr(1:i1,1:i2) = bmiss
 
   ! Parse or recall the input string
   call string(str,lun,i1,io)
@@ -1415,13 +1397,7 @@ recursive subroutine ufbseq(lunin,usr,i1,i2,iret,str)
     'BUFR FILE DOES NOT AGREE WITH EXPECTED LOCATION IN INTERNAL SUBSET ARRAY')
 
   ! Initialize usr array preceeding an input operation
-  if(io==0) then
-    do j=1,i2
-      do i=1,I1
-        usr(i,j) = bmiss
-      enddo
-    enddo
-  endif
+  if(io==0) usr(1:i1,1:i2) = bmiss
 
   ! Find the parameters of the specified sequence
   outer: do node=inode(lun),isc(inode(lun))
@@ -2345,14 +2321,7 @@ recursive subroutine ufbevn(lunit,usr,i1,i2,i3,iret,str)
   call string(str,lun,i1,0)
 
   ! Initialize usr array
-
-  do k=1,i3
-    do j=1,i2
-      do i=1,i1
-        usr(i,j,k) = bmiss
-      enddo
-    enddo
-  enddo
+  usr(1:i1,1:i2,1:i3) = bmiss
 
   ! Loop over condition windows
 
@@ -2583,10 +2552,7 @@ recursive subroutine ufbget(lunit,tab,i1,iret,str)
   endif
 
   iret = 0
-
-  do i=1,i1
-    tab(i) = bmiss
-  enddo
+  tab(1:i1) = bmiss
 
   ! Make sure a file/message is open for input
 
diff --git a/test/test_scripts/test_sinv.sh b/test/test_scripts/test_sinv.sh
index bb1d965c..8eb62764 100755
--- a/test/test_scripts/test_sinv.sh
+++ b/test/test_scripts/test_sinv.sh
@@ -31,7 +31,7 @@ set +e
 # Test #3, for wrong number of arguments.
 outfile_3=testrun/sinv_3.out
 ../utils/sinv > ${outfile_3}
-[[ ${?} -ne 2 || `grep -c "Usage: sinv <satbufrfile>" ${outfile_3}` -ne 1 ]] && exit 3
+[[ ${?} -ne 2 || `grep -c "Usage: sinv satbufrfile" ${outfile_3}` -ne 1 ]] && exit 3
 
 # Success!
 exit 0
diff --git a/utils/sinv.F90.in b/utils/sinv.F90.in
index a3569b52..8e6d886a 100644
--- a/utils/sinv.F90.in
+++ b/utils/sinv.F90.in
@@ -3,7 +3,9 @@
 !>
 !> @author J Woollen @date 2010
 
-!> Usage: sinv \<satbufrfile\> will print inventory of satellites by platform and instrument.
+!> Usage: sinv satbufrfile \<tabledir\> will print an inventory of satellites in the
+!> satbufrfile by platform and instrument.  The optional tabledir argument can be used
+!> to specify a custom directory for the master BUFR tables.
 !>
 !> @return 0 for success, error message otherwise.
 !>
@@ -35,7 +37,7 @@ program sinv
 
   narg=command_argument_count()
   if(narg<1) then
-     write(*,*)'Usage: sinv <satbufrfile> will print inventory of satellites by platform and instrument'
+     write(*,*)'Usage: sinv satbufrfile <tabledir> will print inventory of satbufrfile by platform and instrument'
      call exit(2)
   endif
   call get_command_argument(1,file)