11-22-2018
If your field delimiter is sometimes a field delimiter and sometimes data, you need to be able to very clearly identify each occurrence of that character as either data or delimiter. If you can't specify a clear rule that unambiguously determines whether a given character is a delimiter or data, there is no way to identify field boundaries.
And when you have field delimiters that are sometimes data AND record delimiters that are sometimes data, you have a real mess.
Your best choice would be to choose a different field delimiter that cannot ever appear as data.
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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)