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Full Discussion: Tabbing a line a variable number of times in shell
Top Forums Shell Programming and Scripting Tabbing a line a variable number of times in shell Post 302603546 by drl on Thursday 1st of March 2012 09:39:03 AM
Old 03-01-2012
Hi.

For tcsh + standard utilities, TABS and SPACES:
Code:
#!/usr/bin/env tcsh

# @(#) s1	Demonstrate indents by eliminating all but "/", changing to TAB, SPACES.

# Infrastructure details, environment, commands for forum posts. 
# Uncomment setenv command to run script as external user.
# setenv PATH "/usr/local/bin:/usr/bin:/bin"
echo
setenv LC_ALL C ; setenv LANG C
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility version)"
sh -c "version >/dev/null 2>&1 && version '=o' tcsh tr sed"
echo

set filea=/blah1/blah2/blah3
set fileb=/blah1/blah2/blah3/blah4
set filec=/blah1/blah2/blah3/blah4/blah5

# Remove everything except "/", then change "/" to a tab.
echo " Results, with tabs:"
foreach file ( $filea $fileb $filec )
  set TABS="`echo $file | tr -cd '/' | tr '/' '	'`"
  echo "${TABS}Hello"
end

# Remove everything except "/", then change "/" to spaces.
echo " Results, with spaces:"
foreach file ( $filea $fileb $filec )
  set SPACES="`echo $file | tr -cd '/' | sed 's=/=  =g'`"
  echo "${SPACES}Hello"
end

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility version)
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
tcsh 6.14.00
tr (GNU coreutils) 6.10
sed GNU sed version 4.1.5

 Results, with tabs:
			Hello
				Hello
					Hello
 Results, with spaces:
      Hello
        Hello
          Hello

I prefer spaces, but tabs can be useful as well.

See man pages for details ... cheers, drl

PS: Standard advice -- use Bourne shell family for scripting.
 

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LEARN ABOUT LINUX

echo

ECHO(1) 							   User Commands							   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
	      output version information and exit

       If -e is in effect, the following sequences are recognized:

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       e     escape

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NNN  byte with octal value NNN (1 to 3 digits)

       xHH   byte with hexadecimal value HH (1 to 2 digits)

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Brian Fox and Chet Ramey.

REPORTING BUGS

       Report echo bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report echo translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 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

       The full documentation for echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site,  the
       command

	      info coreutils 'echo invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							   ECHO(1)
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