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Full Discussion: Check for difference in output of 2 commands?
Top Forums UNIX for Dummies Questions & Answers Check for difference in output of 2 commands? Post 302489824 by methyl on Friday 21st of January 2011 06:30:52 PM
Old 01-21-2011
What Operating System are you running?
What Shell are you using?

Scrutinizer has quite correctly posted code using the unix "diff" program which is common to all unix versions.
The "diff" program is a buffered context compare program and shows the context of the difference and the address within each file of the difference. It is a very useful tool for comparing files which are similar and where the data is in no particular order. The "<" ">" signs tell you which file the difference came from.
It is very useful for comparing program code. For larger files there are usually special versions of diff supplied like "bdiff".


Let's say we just want to know the differences regardless of which file they came from and with no context and in no order relative to either file. I use this technique a lot for comparing code, but it works equally well for "ls".
Code:
ls -l > /tmp/my_temp_file
ls -le >> /tmp/my_temp_file
cat my_temp_file | sort | uniq -u

(Yes I know I have used "cat". I like left-to-right flow).

If you really need a one-line solution just replace each newline with a semi-colon.
This User Gave Thanks to methyl For This Post:
turbofayce
 

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LEARN ABOUT OPENDARWIN

bdiff

bdiff(1)							   User Commands							  bdiff(1)

NAME

       bdiff - big diff

SYNOPSIS

       bdiff filename1 filename2 [n] [-s]

DESCRIPTION

       bdiff  is  used in a manner analogous to diff to find which lines in filename1 and filename2 must be changed to bring the files into agree-
       ment. Its purpose is to allow processing of files too large for diff. If filename1 (filename2) is -, the standard input is read.

       bdiff ignores lines common to the beginning of both files, splits the remainder of each file into n-line segments, and invokes diff on cor-
       responding segments. If both optional arguments are specified, they must appear in the order indicated above.

       The  output  of	bdiff  is exactly that of diff, with line numbers adjusted to account for the segmenting of the files (that is, to make it
       look as if the files had been processed whole). Note:  Because of the segmenting of the files, bdiff does not necessarily find  a  smallest
       sufficient set of file differences.

OPTIONS

       n	The  number  of line segments. The value of n is 3500 by default. If the optional third argument is given and it is numeric, it is
		used as the value for n. This is useful in those cases in which 3500-line segments are too large for diff, causing it to fail.

       -s	Specifies that no diagnostics are to be printed by bdiff (silent option). Note:  However, this does not suppress possible diagnos-
		tic messages from diff, which bdiff calls.

USAGE

       See largefile(5) for the description of the behavior of bdiff when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /tmp/bd?????

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       diff(1), attributes(5), largefile(5)

DIAGNOSTICS

       Use help for explanations.

SunOS 5.10							    14 Sep 1992 							  bdiff(1)
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