diff --git a/runtime/doc/xxd.man b/runtime/doc/xxd.man
index 894dfea..935751c 100644
--- a/runtime/doc/xxd.man
+++ b/runtime/doc/xxd.man
@@ -130,16 +130,16 @@
 
        Rewind  stdin before reading; needed because the `cat' has already read
        to the end of stdin.
-       % sh -c 'cat > plain_copy; xxd -s 0 > hex_copy' < file
+       % sh -c "cat > plain_copy; xxd -s 0 > hex_copy" < file
 
        Hexdump from file position 0x480 (=1024+128)  onwards.   The  `+'  sign
        means "relative to the current position", thus the `128' adds to the 1k
        where dd left off.
-       % sh -c 'dd of=plain_snippet bs=1k count=1; xxd -s +128 >  hex_snippet'
+       % sh -c "dd of=plain_snippet bs=1k count=1; xxd -s +128 >  hex_snippet"
        < file
 
        Hexdump from file position 0x100 ( = 1024-768) on.
-       % sh -c 'dd of=plain_snippet bs=1k count=1; xxd -s +-768 > hex_snippet'
+       % sh -c "dd of=plain_snippet bs=1k count=1; xxd -s +-768 > hex_snippet"
        < file
 
        However, this is a rare situation and the use of `+' is rarely  needed.
@@ -147,10 +147,10 @@
        truss(1), whenever -s is used.
 
 EXAMPLES
-       Print everything but the first three lines (hex 0x30 bytes) of file
+       Print everything but the first three lines (hex 0x30 bytes) of file.
        % xxd -s 0x30 file
 
-       Print 3 lines (hex 0x30 bytes) from the end of file
+       Print 3 lines (hex 0x30 bytes) from the end of file.
        % xxd -s -0x30 file
 
        Print 120 bytes as continuous hexdump with 40 octets per line.
@@ -183,13 +183,13 @@
        % xxd input_file | xxd -r -s 100 > output_file
 
        Patch the date in the file xxd.1
-       % echo '0000037: 3574 68' | xxd -r - xxd.1
+       % echo "0000037: 3574 68" | xxd -r - xxd.1
        % xxd -s 0x36 -l 13 -c 13 xxd.1
        0000036: 3235 7468 204d 6179 2031 3939 36  25th May 1996
 
        Create a 65537 byte file with all bytes 0x00, except for the  last  one
        which is 'A' (hex 0x41).
-       % echo '010000: 41' | xxd -r > file
+       % echo "010000: 41" | xxd -r > file
 
        Hexdump this file with autoskip.
        % xxd -a -c 12 file
@@ -200,7 +200,7 @@
        Create  a  1  byte  file containing a single 'A' character.  The number
        after '-r -s' adds to the linenumbers found in the file; in effect, the
        leading bytes are suppressed.
-       % echo '010000: 41' | xxd -r -s -0x10000 > file
+       % echo "010000: 41" | xxd -r -s -0x10000 > file
 
        Use xxd as a filter within an editor such as vim(1) to hexdump a region
        marked between `a' and `z'.