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Full Discussion: sed command within script wrongly deleting the last line
Top Forums Shell Programming and Scripting sed command within script wrongly deleting the last line Post 303014613 by RudiC on Friday 16th of March 2018 06:55:48 AM
Old 03-16-2018
Quote:
Originally Posted by rbalaj16
. . .

Let me know if anything else i can try. Thanks again.

. . .
Can't. The specification is too sparse (for me) to analyse the error you describe, and the samples don't allow to reproduce it. So don't expect to learn what is going wrong.

Let me open my magic box, dig out my soft skills, and try to paraphrase what I infer from your data and what you say:
There is a file with replacement definitions in the shape varA=ValA, and a (or some) file(s) in which to-be-replaced entries are enclosed in ~ . Entries found are to be substituted by the defined new values.

SHOULD this be close to what you want, consider this proposal:
Code:
sed 's:^:s#~:; s:=:~#:; s:$:#:; ' b.txt | sed -f- a.txt
line1
line2
/proj/apps/sun
line4

Last edited by RudiC; 03-16-2018 at 08:17 AM..
 

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LEARN ABOUT DEBIAN

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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