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Extracting Multiple Lines from a Text File

 
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Old 12-19-2011
Extracting Multiple Lines from a Text File
Hello. I am sorry if this is a common question but through all my searching, I haven't found an answer which matches what I want to do.

I am looking for a sed command that will parse through a large text file and extract lines that start with specific words (which are repeated throughout the file).

Example Text
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
<blankline>
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
<blankline>
Line 1: This is example line 1
Line 2: This is example line 2
Line 3: This is example line 3
Line 4: This is example line 4
Line 5: This is example line 5
etc.

Output Needed (in a new text file):
Line 2: This is example line 2
Line 4: This is example line 4
<blankline>
Line 2: This is example line 2
Line 4: This is example line 4
<blankline>
Line 2: This is example line 2
Line 4: This is example line 4
etc.

I tried grep but couldn't get the command to understand the separate lines.

Again, sorry if this is an obvious answer but finding it fails me.
Thanks.
 
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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)