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\"     @(#)cmp.1        8.1 (Berkeley) 6/6/93
\"
Dd December 13, 2016
Dt CMP 1
Os
Sh NAME
Nm cmp
Nd compare two files
Sh SYNOPSIS
Nm
Op Fl c
Op Fl l | Fl s
Ar file1 file2
Op Ar skip1 Op Ar skip2
Sh DESCRIPTION
The cmp utility compares two files of any type and writes the results
to the standard output.
By default,
Nm
is silent if the files are the same; if they differ, the byte
and line number at which the first difference occurred is reported.
Pp
Bytes and lines are numbered beginning with one.
Pp
The following options are available:
Bl -tag -width flag
It Fl c
Do the compare using
Xr getc 3
rather than
Xr mmap 2 .
Combined with the
Fl l
flag, this can be helpful in locating an I/O error in the underlying
device.
It Fl l
Print the byte number (decimal) and the differing
byte values (octal) for each difference.
It Fl s
Print nothing for differing files; return exit
status only.
El
Pp
The optional arguments
Ar skip1
and
Ar skip2
are the byte offsets from the beginning of
Ar file1
and
Ar file2 ,
respectively, where the comparison will begin.
The offset is decimal by default, but may be expressed as an hexadecimal
or octal value by preceding it with a leading ``0x'' or ``0''.
Sh EXIT STATUS
The
Nm
utility exits with one of the following values:
Bl -tag -width 4n
It 0
The files are identical.
It 1
The files are different; this includes the case
where one file is identical to the first part of
the other.
In the latter case, if the
Fl s
option has not been specified,
Nm
writes to standard output that EOF was reached in the shorter
file (before any differences were found).
It >1
An error occurred.
El
Sh SEE ALSO
Xr comm 1 ,
Xr diff 1 ,
Xr diff3 1 ,
Xr sdiff 1
Sh STANDARDS
The
Nm
utility is expected to be
St -p1003.2
compatible.
Sh HISTORY
The
Nm
utility first appeared in
At v1 .

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