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Full Discussion: sed search pattern and delete lines
Top Forums Shell Programming and Scripting sed search pattern and delete lines Post 302701795 by Don Cragun on Monday 17th of September 2012 10:42:08 AM
Old 09-17-2012
Eightball,
You said you want to delete two lines before the matched line and one line after the matched line, but your example deletes two lines before the match line and the matched line (leaving the line after the match as it was).

The script Ygor provided will provide output matching your example output, but only works on Linux systems (according to the man pages provided on this site, the tac utility is not available on OpenSolaris, FreeBSD, OSX, or POSIX systems).

The following ed script should work on any of these systems:
Code:
#!/bin/ksh
# Usage: edscript pattern input_file output_file
#    Find the 1st line in "input_file" selected by the basic regular
#    expression "BRE"; delet the selected line, two lines before it, and
#    one line after it; and write the update file to "output_file".
ed -s "$2" <<-END
        /$1/-2;.+2d
        w $3
END

save the above script in a file named edscript, make it executable by running the command:
Code:
chmod +x edscript

and then (assuming the input file you specified in your example is named in, execute the command:
Code:
edscript MICHAEL in out

to make the changes suggested by the sample output you provided and save the output in a file named out.
 

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LEARN ABOUT NETBSD

uniq

UNIQ(1) 						    BSD General Commands Manual 						   UNIQ(1)

NAME

     uniq -- report or filter out repeated lines in a file

SYNOPSIS

     uniq [-cdu] [-f fields] [-s chars] [input_file [output_file]]

DESCRIPTION

     The uniq utility reads the standard input comparing adjacent lines, and writes a copy of each unique input line to the standard output.  The
     second and succeeding copies of identical adjacent input lines are not written.  Repeated lines in the input will not be detected if they are
     not adjacent, so it may be necessary to sort the files first.

     The following options are available:

     -c      Precede each output line with the count of the number of times the line occurred in the input, followed by a single space.

     -d      Don't output lines that are not repeated in the input.

     -f fields
	     Ignore the first fields in each input line when doing comparisons.  A field is a string of non-blank characters separated from adja-
	     cent fields by blanks.  Field numbers are one based, i.e. the first field is field one.

     -s chars
	     Ignore the first chars characters in each input line when doing comparisons.  If specified in conjunction with the -f option, the
	     first chars characters after the first fields fields will be ignored.  Character numbers are one based, i.e. the first character is
	     character one.

     -u      Don't output lines that are repeated in the input.

     If additional arguments are specified on the command line, the first such argument is used as the name of an input file, the second is used
     as the name of an output file.

     The uniq utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY

     The historic +number and -number options have been deprecated but are still supported in this implementation.

SEE ALSO

     sort(1)

STANDARDS

     The uniq utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								  January 6, 2007							       BSD
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