04-08-2019
Hi nag_sathi,
It looks like RudiC answered the question for you while I was sleeping last night. Do you still have questions about how that sed search command works?
Note that the ability to use any character as a field delimiter is not portable to all operating systems, but does work on Linux systems (and other systems using the GNU sed utility). If you want to write a script that will be portable to other systems, avoid using the <newline> character as a delimiter and avoid using the <null> byte as a delimiter. Even on Linux systems, some shells might not correctly pass your substitute command to sed correctly if you use a literal <null> byte as your delimiter.
Note that I do not know of any shells usually deployed with Linux systems that have this restriction, but the standards say that the input given to the shell is a text file with unlimited line lengths and <null> bytes are not allowed in text files.
This User Gave Thanks to Don Cragun For This Post:
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CUT(1) User Commands CUT(1)
NAME
cut - remove sections from each line of files
SYNOPSIS
cut OPTION... [FILE]...
DESCRIPTION
Print selected parts of lines from each FILE to standard output.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
-b, --bytes=LIST
select only these bytes
-c, --characters=LIST
select only these characters
-d, --delimiter=DELIM
use DELIM instead of TAB for field delimiter
-f, --fields=LIST
select only these fields; also print any line that contains no delimiter character, unless the -s option is specified
-n (ignored)
--complement
complement the set of selected bytes, characters or fields
-s, --only-delimited
do not print lines not containing delimiters
--output-delimiter=STRING
use STRING as the output delimiter the default is to use the input delimiter
-z, --zero-terminated
line delimiter is NUL, not newline
--help display this help and exit
--version
output version information and exit
Use one, and only one of -b, -c or -f. Each LIST is made up of one range, or many ranges separated by commas. Selected input is written
in the same order that it is read, and is written exactly once. Each range is one of:
N N'th byte, character or field, counted from 1
N- from N'th byte, character or field, to end of line
N-M from N'th to M'th (included) byte, character or field
-M from first to M'th (included) byte, character or field
AUTHOR
Written by David M. Ihnat, David MacKenzie, and Jim Meyering.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report cut translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/cut>
or available locally via: info '(coreutils) cut invocation'
GNU coreutils 8.28 January 2018 CUT(1)