Add iseek= and oseek= aliases for the preexisting skip= and seek=

operands.  Can _YOU_ tell skip= and seek= apart with 100% accuracy
every time?

This also seems to make us option-for-option compatible with the
Solaris dd(1).

Approved by:	jkh
Suggested by:	peter

2 files changed, 13 insertions, 1 deletions

diff --git a/bin/dd/args.c b/bin/dd/args.c
index 418b5cc..9843ddb 100644
--- a/bin/dd/args.c
+++ b/bin/dd/args.c
@@ -82,8 +82,10 @@ static const struct arg {
 	{ "files",	f_files,	C_FILES, C_FILES },
 	{ "ibs",	f_ibs,		C_IBS,	 C_BS|C_IBS },
 	{ "if",		f_if,		C_IF,	 C_IF },
+	{ "iseek",	f_skip,		C_SKIP,	 C_SKIP },
 	{ "obs",	f_obs,		C_OBS,	 C_BS|C_OBS },
 	{ "of",		f_of,		C_OF,	 C_OF },
+	{ "oseek",	f_seek,		C_SEEK,	 C_SEEK },
 	{ "seek",	f_seek,		C_SEEK,	 C_SEEK },
 	{ "skip",	f_skip,		C_SKIP,	 C_SKIP },
 };
diff --git a/bin/dd/dd.1 b/bin/dd/dd.1
index 32260e9..b34dcc6 100644
--- a/bin/dd/dd.1
+++ b/bin/dd/dd.1
@@ -96,10 +96,20 @@ bytes instead of the default 512.
 Read input from
 .Ar file
 instead of the standard input.
+.It Cm iseek= Ns Ar n
+Seek on the input file
+.Va n
+blocks.  This is a synonym for
+.Cm skip= Ns Ar n .
 .It Cm obs= Ns Ar n
 Set the output block size to
 .Va n
 bytes instead of the default 512.
+.It Cm oseek= Ns Ar n
+Seek on the output file
+.Va n
+blocks.  This is a synonym for
+.Cm seek= Ns Ar n .
 .It Cm of= Ns Ar file
 Write output to
 .Ar file
@@ -107,7 +117,7 @@ instead of the standard output.
 Any regular output file is truncated unless the
 .Cm notrunc
 conversion value is specified.
-If an initial portion of the output file is skipped (see the
+If an initial portion of the output file is seeked past (see the
 .Cm seek
 operand),
 the output file is truncated at that point.