10-18-2016
You may want to look at the 'tabs' command.
This controls the default number of spaces.
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while IFS="" read r; do
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LEARN ABOUT REDHAT
unexpand
UNEXPAND(1) FSF UNEXPAND(1)
NAME
unexpand - convert spaces to tabs
SYNOPSIS
unexpand [OPTION]... [FILE]...
DESCRIPTION
Convert spaces in each FILE to tabs, writing to standard output. With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
-a, --all
convert all whitespace, instead of initial whitespace
-t, --tabs=NUMBER
have tabs NUMBER characters apart instead of 8
-t, --tabs=LIST
use comma separated list of explicit tab positions
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by David MacKenzie.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for unexpand is maintained as a Texinfo manual. If the info and unexpand programs are properly installed at your
site, the command
info unexpand
should give you access to the complete manual.
unexpand (coreutils) 4.5.3 February 2003 UNEXPAND(1)