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Full Discussion: Insert blank line if grep not found
Top Forums Shell Programming and Scripting Insert blank line if grep not found Post 45856 by Perderabo on Sunday 4th of January 2004 06:17:14 PM
Old 01-04-2004
Re: I also tried...
Quote:
Originally posted by michieka
cat file1 | while read line
do grep $line file2 >> file3

if [ $? -eq 1 ]
then
print "\n" >> file3
fi
done

This still only gives me a file3 of:
123 Joe
456 Man
101 Rob

I need to account for the fact that 789 and 121 of file1 were not found in file2.

Thanks again...
You seem to have a couple of theories about what you want. Your second post seems to solve the problem posed by your first post more or less.

What shell are you using? What system? You should control which shell runs your script with a line like:
#! /usr/bin/ksh
as the first line.

You don't want to print "\n"; just use print. It adds a new line automatically.

That cat process is not doing anything useful. Open the file with exec and then start reading it:
exec < file
while read line

grep will set $? to 1 if there were no matches so you should be ok if you run the script as you posted it...no lines after the grep and before the if.
 

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LEARN ABOUT OSX

merge

MERGE(1)						      General Commands Manual							  MERGE(1)

NAME

       merge - three-way file merge

SYNOPSIS

       merge [ options ] file1 file2 file3

DESCRIPTION

       merge  incorporates all changes that lead from file2 to file3 into file1.  The result ordinarily goes into file1.  merge is useful for com-
       bining separate changes to an original.	Suppose file2 is the original, and both file1 and file3 are modifications of  file2.   Then  merge
       combines both changes.

       A  conflict  occurs  if	both  file1 and file3 have changes in a common segment of lines.  If a conflict is found, merge normally outputs a
       warning and brackets the conflict with <<<<<<< and >>>>>>> lines.  A typical conflict will look like this:

	      <<<<<<< file A
	      lines in file A
	      =======
	      lines in file B
	      >>>>>>> file B

       If there are conflicts, the user should edit the result and delete one of the alternatives.

OPTIONS

       -A     Output conflicts using the -A style of diff3(1), if supported by diff3.  This merges all changes leading from file2  to  file3  into
	      file1, and generates the most verbose output.

       -E, -e These  options  specify conflict styles that generate less information than -A.  See diff3(1) for details.  The default is -E.  With
	      -e, merge does not warn about conflicts.

       -L label
	      This option may be given up to three times, and specifies labels to be used in place of the corresponding  file  names  in  conflict
	      reports.	 That  is, merge -L x -L y -L z a b c generates output that looks like it came from files x, y and z instead of from files
	      a, b and c.

       -p     Send results to standard output instead of overwriting file1.

       -q     Quiet; do not warn about conflicts.  -V Print 's version number.

DIAGNOSTICS

       Exit status is 0 for no conflicts, 1 for some conflicts, 2 for trouble.

IDENTIFICATION

       Author: Walter F. Tichy.
       Manual Page Revision: 1.1; Release Date: 1999/04/23.
       Copyright (C) 1982, 1988, 1989 Walter F. Tichy.
       Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert.

SEE ALSO

       diff3(1), diff(1), rcsmerge(1), co(1).

BUGS

       It normally does not make sense to merge binary files as if they were text, but merge tries to do it anyway.

GNU
								    1999/04/23								  MERGE(1)
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