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Full Discussion: Need sed help: find regex and if the next next line is blank, delete both
Top Forums Shell Programming and Scripting Need sed help: find regex and if the next next line is blank, delete both Post 302542841 by alister on Thursday 28th of July 2011 06:55:32 PM
Old 07-28-2011
Quote:
Originally Posted by Scottie1954
Thank you, Chubler_XL and Alister, for replying. I've tried both but hp-ux is having some difficulties.

For Chubler_XL's code, sed tells me:

Code:
sed: Function /[0-9]-[0-9][0-9]/{N;/\n$/d} cannot be parsed.

And for Alister's example:

Code:
sed: /[0-9]-[0-9][0-9]{$q; N; /\n$/d;} is not a recognized function.

Chubler_XL's suggestion is missing a semicolon. To be posix-compliant, there should be a semi-colon after the d command:
Code:
sed '/[0-9]-[0-9][0-9]/{N;/\n$/d;}' infile > outfile

With regard to my example, it seems you may have mistyped it. In your error message, there is no slash delimiting the end of the pattern (what seems to have been omitted is in bold red):
Code:
sed '/PATTERN/{$q; N; /\n$/d;}'

Regards,
Alister
This User Gave Thanks to alister For This Post:
Scottie1954
 

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LEARN ABOUT LINUX

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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