Manipulating sed Direct Input to Direct Output Post: 302760155

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Top Forums Shell Programming and Scripting Manipulating sed Direct Input to Direct Output Post 302760155 by Don Cragun on Wednesday 23rd of January 2013 12:50:35 PM

01-23-2013

Registered User

Quote:

Originally Posted by the0nion

Wow....that was quick..
Your 2nd syntax, is it something to be read as,
"find <123:abc:>" then replace 2nd occurance of ":" with ":$" ?

Yes. I would have stated how it behaves as: If a line contains the string "123:abc:" change the 2nd occurrence of ":" on that line to ":$" and then print the modified line.

Quote:

I just came up with another issue. the /I flag

I somehow cant seem to combine /I and /2p together.
I also need to change all my ":" to ",", just for output sake.

The standards don't have an I flag for the sed s command. The Mac OS X system I use when testing stuff I post on this forum doesn't have an I flag for th sed s command. The Linux man sed man page in this forum doesn't mention any flags but says to look for another document that I don't have to determine how sed works on Linux.

If you can tell me what the I flag is supposed to do, I may be able to help, but I have no idea what it does nor why you would want to use it.

I missed the part about changing colons to commas. I still don't have a clear statement of what you're really trying to do. So, back to my original posting:

If you just want to add a $ after the 2nd colon and change colons to commas in each line, try:

Code:

sed 's/:/,/;s/:/,$/' input_file

If you just want to do that on a line that starts with 123:abc: and only print lines that sed modifies, try:

Code:

sed -n 's/:/,/;/123,abc:/s/:/,$/p' input_file

Don Cragun

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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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