diff --git a/README b/README
index aa18ede..580caca 100644
--- a/README
+++ b/README
@@ -8,104 +8,104 @@ The following tools are implemented:
 
 '#'  -> UTF-8 support, '=' -> Implicit UTF-8 support, '*' -> Finished,
 '|'  -> Audited,       'o' -> POSIX 2013 compliant,   'x' -> Non-POSIX,
-'()' -> Petty flag
+'0'  -> NUL handling,  '()' -> Petty flag
 
      UTILITY         MISSING
      -------         -------
-=*|o basename        .
-=*|o cal             .
-=*|o cat             .
-=*|o chgrp           .
-=*|o chmod           .
-=*|o chown           .
-=*|x chroot          .
-=*|o cksum           .
-=*|o cmp             .
-#*|x cols            .
-=*|o comm            .
-=*|o cp              (-i)
-=*|x cron            .
-#*|o cut             .
-=*|o date            .
-=*|o dirname         .
-=*|o du              .
-=*|o echo            .
-   o ed              .
-=*|o env             .
-#*|o expand          .
-#*|o expr            .
-=*|o false           .
-=    find            .
-=* x flock           .
-#*|o fold            .
-=*|o getconf         (-v)
-=*|o grep            .
-=*|o head            .
-=*|x hostname        .
-=*|x install         .
-=* o join            .
-=*|o kill            .
-=*|o link            .
-=*|o ln              .
-=*|o logger          .
-=*|o logname         .
-#* o ls              (-C, -k, -m, -p, -s, -x)
-=*|x md5sum          .
-=*|o mkdir           .
-=*|o mkfifo          .
-=*|x mktemp          .
-=*|o mv              (-i)
-=*|o nice            .
-#*|o nl              .
-=*|o nohup           .
-=*|o od              .
-#* o pathchk         .
-#*|o paste           .
-=*|x printenv        .
-#*|o printf          .
-=*|o pwd             .
-=*|x readlink        .
-=*|o renice          .
-=*|o rm              (-i)
-=*|o rmdir           .
-#    sed             .
-=*|x seq             .
-=*|x setsid          .
-=*|x sha1sum         .
-=* x sha224sum       .
-=*|x sha256sum       .
-=* x sha238sum       .
-=*|x sha512sum       .
-=* x sha512-224sum   .
-=* x sha512-256sum   .
-=*|o sleep           .
-#*|o sort            .
-=*|o split           .
-=*|x sponge          .
-#*|o strings         .
-=*|x sync            .
-=*|o tail            .
-=*|x tar             .
-=*|o tee             .
-=*|o test            .
-=*|x tftp            .
-=*|o time            .
-=*|o touch           .
-#*|o tr              .
-=*|o true            .
-=* o tsort           .
-=*|o tty             .
-=*|o uname           .
-#*|o unexpand        .
-=*|o uniq            .
-=*|o unlink          .
-=*|o uudecode        .
-=*|o uuencode        .
-#*|o wc              .
-=*|x which           .
-=*|x whoami          .
-=*|o xargs           (-p)
-=*|x yes             .
+0=*|o basename        .
+0=*|o cal             .
+0=*|o cat             .
+0=*|o chgrp           .
+0=*|o chmod           .
+0=*|o chown           .
+0=*|x chroot          .
+0=*|o cksum           .
+0=*|o cmp             .
+ #*|x cols            .
+ =*|o comm            .
+0=*|o cp              (-i)
+0=*|x cron            .
+ #*|o cut             .
+0=*|o date            .
+0=*|o dirname         .
+0=*|o du              .
+0=*|o echo            .
+    o ed              .
+0=*|o env             .
+0#*|o expand          .
+0#*|o expr            .
+0=*|o false           .
+0=    find            .
+0=* x flock           .
+ #*|o fold            .
+0=*|o getconf         (-v)
+ =*|o grep            .
+ =*|o head            .
+0=*|x hostname        .
+0=*|x install         .
+ =* o join            .
+0=*|o kill            .
+0=*|o link            .
+0=*|o ln              .
+ =*|o logger          .
+0=*|o logname         .
+0#* o ls              (-C, -k, -m, -p, -s, -x)
+0=*|x md5sum          .
+0=*|o mkdir           .
+0=*|o mkfifo          .
+0=*|x mktemp          .
+0=*|o mv              (-i)
+0=*|o nice            .
+ #*|o nl              .
+0=*|o nohup           .
+0=*|o od              .
+0#* o pathchk         .
+ #*|o paste           .
+0=*|x printenv        .
+0#*|o printf          .
+0=*|o pwd             .
+0=*|x readlink        .
+0=*|o renice          .
+0=*|o rm              (-i)
+0=*|o rmdir           .
+ #    sed             .
+0=*|x seq             .
+0=*|x setsid          .
+0=*|x sha1sum         .
+0=* x sha224sum       .
+0=*|x sha256sum       .
+0=* x sha238sum       .
+0=*|x sha512sum       .
+0=* x sha512-224sum   .
+0=* x sha512-256sum   .
+0=*|o sleep           .
+ #*|o sort            .
+0=*|o split           .
+0=*|x sponge          .
+0#*|o strings         .
+0=*|x sync            .
+ =*|o tail            .
+0=*|x tar             .
+0=*|o tee             .
+0=*|o test            .
+0=*|x tftp            .
+0=*|o time            .
+0=*|o touch           .
+0#*|o tr              .
+0=*|o true            .
+0=* o tsort           .
+0=*|o tty             .
+0=*|o uname           .
+0#*|o unexpand        .
+ =*|o uniq            .
+0=*|o unlink          .
+0=*|o uudecode        .
+0=*|o uuencode        .
+0#*|o wc              .
+0=*|x which           .
+0=*|x whoami          .
+ =*|o xargs           (-p)
+0=*|x yes             .
 
 The  complement of  sbase  is  ubase[1] which  is  Linux-specific  and
 provides all  the non-portable tools.   Together they are  intended to