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Full Discussion: Ignore identical lines
Top Forums Shell Programming and Scripting Ignore identical lines Post 302259875 by forumthreads on Wednesday 19th of November 2008 06:29:41 AM
Old 11-19-2008
Hello Franklin,

Many thanks for your reply.

I tried both awk and grep commands but get syntax errors.

For the grep command the error is

>grep -v -f old new
grep: illegal option --f

For the awk command this is what i get

>awk 'NR==FNR{a[$0];next}!($0 in a)' old new
awk: syntax error near line 1
awk: bailing out near line

could you let me know where i am going wrong please.

Thanks again
 

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LEARN ABOUT NETBSD

sdiff

SDIFF(1)						    BSD General Commands Manual 						  SDIFF(1)

NAME

     sdiff -- side-by-side diff

SYNOPSIS

     sdiff [-abdilstW] [-I regexp] [-o outfile] [-w width] file1 file2

DESCRIPTION

     sdiff displays two files side by side, with any differences between the two highlighted as follows: new lines are marked with '>'; deleted
     lines are marked with '<'; and changed lines are marked with '|'.

     sdiff can also be used to interactively merge two files, prompting at each set of differences.  See the -o option for an explanation.

     The options are:

     -l      Only print the left column for identical lines.

     -o outfile
	     Interactively merge file1 and file2 into outfile.	In this mode, the user is prompted for each set of differences.  See EDITOR and
	     VISUAL, below, for details of which editor, if any, is invoked.

	     The commands are as follows:

	     l	     Choose left set of diffs.

	     r	     Choose right set of diffs.

	     s	     Silent mode - identical lines are not printed.

	     v	     Verbose mode - identical lines are printed.

	     e	     Start editing an empty file, which will be merged into outfile upon exiting the editor.

	     e l     Start editing file with left set of diffs.

	     e r     Start editing file with right set of diffs.

	     e b     Start editing file with both sets of diffs.

	     q	     Quit sdiff.

     -s      Skip identical lines.

     -w width
	     Print a maximum of width characters on each line.	The default is 130 characters.

     Options passed to diff(1) are:

     -a      Treat file1 and file2 as text files.

     -b      Ignore trailing blank spaces.

     -d      Minimize diff size.

     -I regexp
	     Ignore line changes matching regexp.  All lines in the change must match regexp for the change to be ignored.

     -i      Do a case-insensitive comparison.

     -t      Expand tabs to spaces.

     -W      Ignore all spaces (the -w flag is passed to diff(1)).

ENVIRONMENT

     EDITOR, VISUAL
	     Specifies an editor to use with the -o option.  If both EDITOR and VISUAL are set, VISUAL takes precedence.  If neither EDITOR nor
	     VISUAL are set, the default is vi(1).

     TMPDIR  Specifies a directory for temporary files to be created.  The default is /tmp.

SEE ALSO

     diff(1), diff3(1), vi(1), re_format(7)

AUTHORS

     sdiff was written from scratch for the public domain by Ray Lai <ray@cyth.net>.

CAVEATS

     Although undocumented, sdiff supports all options supported by GNU sdiff.	Some options require GNU diff.

     Tabs are treated as anywhere from one to eight characters wide, depending on the current column.  Terminals that treat tabs as eight charac-
     ters wide will look best.

BUGS

     sdiff may not work with binary data.

BSD
								 February 21, 2007							       BSD
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