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Full Discussion: a very basic sed one-liner...that isn't working :-(
Top Forums Shell Programming and Scripting a very basic sed one-liner...that isn't working :-( Post 302360440 by skmdu on Friday 9th of October 2009 01:45:08 AM
Old 10-09-2009
You have to use N command in sed to append the next line to the pattern space.

Code:
$ sed '
/^$/b
:loop
$! {
N
/\n *$/!b loop
}
s/\n\([^ ]\)/\t\1/g' a

ROUTER-1-1      Virtual-Access1 is up, line protocol is up      Hardware is Virtual Access interface    MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec,    reliability 255/255, txload 5/255, rxload 4/255 Encapsulation PPP, LCP Open

Dialer0 is up, line protocol is up (spoofing)   Hardware is Unknown     Internet address is 192.168.1.1/32      MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec,    reliability 255/255, txload 1/255, rxload 1/255  Encapsulation PPP, loopback not set

Virtual-Access1 is up, line protocol is up      Hardware is Virtual Access interface    MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec,    reliability 255/255, txload 5/255, rxload 4/255 Encapsulation PPP, LCP Open

Loopback0 is up, line protocol is up    Hardware is Loopback    Description: Version 1.2        Internet address is 10.0.1.1/32 MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation LOOPBACK, loopback not set

Explanation

Code:
1. Keeps adding the non-empty line. and replace new line with tab.
2. When empty line/(lines with only spaces) comes, just print the pattern space and start next cycle. i.e s/\n\([^ ]\)/\t\1/g' a this substitution will not happen for empty lines.

 

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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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