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Top Forums Shell Programming and Scripting Suppress new line at end here string? Post 302913085 by Don Cragun on Wednesday 13th of August 2014 03:48:58 PM
Old 08-13-2014
Quote:
Originally Posted by RudiC
Yes, I thought the same and attributed above behaviour to the -n x option.

So, this non-standard behaviour would explain Michael's findings in his first post of this thread, wouldn't it?
Hi Rudi,
Michael Stora hasn't explained what he means by "quirky". The command and corresponding output shown in his first message in this thread:
Code:
$ echo $( { while read -r -n1 a; do [[ "$a" =~ [[:blank:]] ]] &&  echo -n "\"""$a""\"" || echo -n "\\""$a"; done; } <<<"$inputDirectory" ) | od -t x1c
0000000  5c  2f  5c  68  5c  6f  5c  6d  5c  65  5c  2f  5c  64  5c  69
          \   /   \   h   \   o   \   m   \   e   \   /   \   d   \   i
0000020  5c  72  5c  5c  31  5c  2f  5c  64  5c  69  5c  72  5c  5c  32
          \   r   \   \   1   \   /   \   d   \   i   \   r   \   \   2
0000040  5c  2f  5c  0a
          \   /   \  \n
0000044

ends with a <newline> character because the echo shown in red above adds a <newline> to the output from the command substitution. I see nothing surprising in that. Did I miss some deeper point? I certainly see no evidence that read stored a newline character in a at any time.

I guess I didn't pay much attention to this thread before because all of the echo commands in this thread are non-portable and Michael didn't even bother to tell us what OS or shell he's using. Looking at it closer now, I can deduce that his version of echo uses -n to eliminate the trailing <newline> normally produced as output and that it doesn't expand \ escapes in the strings being processed. But with no explanation of what "quirky" means I didn't see anything that would lead me to guess at what he was expecting that he didn't get.

As I have said in MANY MANY other threads, I always (except when responding to threads like this) avoid echo whenever the 1st argument can have a minus sign as the 1st character (even if the 1st argument is --) and whenever any argument can contain a backslash character. Using printf instead of echo requires two more keystrokes plus a format string, but you always know what you'll get.
 

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COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME
colors -- libbash library for setting tty colors. SYNOPSIS
colorSet <color> colorReset colorPrint [<indent>] <color> <text> colorPrintN [<indent>] <color> <text> DESCRIPTION
General colors is a collection of functions that make it very easy to put colored text on tty. The function list: colorSet Sets the color of the prints to the tty to COLOR colorReset Resets current tty color back to normal colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline) colorPrintN The same as colorPrint, but trailing newline is added Detailed interface description follows. Available colors: Green Red Yellow White The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red). FUNCTIONS DESCRIPTIONS
colorSet <color> Sets the current printing color to color. colorReset Resets current tty color back to normal. colorPrint [<indent>] <color> Prints text using the color color indented by indent (without adding a newline). Parameters: <indent> The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position. <color> The color to use. <color> The text to print. colorPrintN [<indent>] <color> The same as colorPrint, except a trailing newline is added. EXAMPLES
Printing a green 'Hello World' with a newline: Using colorSet: $ colorSet green $ echo 'Hello World' $ colorReset Using colorPrint: $ colorPrint 'Hello World'; echo Using colorPrintN: $ colorPrintN 'Hello World' AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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