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Full Discussion: [BASH] Getting a semi-tailing backslash when passing (escaped) variables to script
Top Forums Shell Programming and Scripting [BASH] Getting a semi-tailing backslash when passing (escaped) variables to script Post 302942481 by sea on Wednesday 29th of April 2015 07:41:56 AM
Old 04-29-2015
Added single quotes, and removed the escape chars from that named if block.
And yes, that $Q was/is an option : -q, sry forgot to mention.

During the writing of tui-cat, i've added a code block to tui-printf (the very core display command) which escaped tailing backslashes, you know, to keep them when using tui-cat, and not get them changed to one-liners...
Seems that function also jumped in as soon the strings contained dollars/variables. Though, it seemed to only add a single backslash at the end of the string.
tui-printf:
Code:
	# Escape trailing backslash, from whichever argument passed
	# This is supposed to 'keep' artificial linebreaks rather than get them on one line
	echo "$FIRST" | grep -q "\\"$ && \
		FIRST="${FIRST}\\\\"
	echo "$SECOND" | grep -q "\\"$ && \
		SECOND="${SECOND}\\\\"
	echo "$THIRD" | grep -q "\\"$ && \
		THIRD="${THIRD}\\\\"
	
	# Escape '%'
	...

So it seems now, that i need something else to preserve articifical linebreaks, but not add unrequred baskslashes to strings with variables...
How to define that $ is supposed to be the line end only, but not a variable indicator at all?
Kind of helpless, as i though the above code whould do so...

Thank you

---------- Post updated at 13:41 ---------- Previous update was at 12:52 ----------

Guess i solved it, at least for this one time test it worked:
Changed it to:
Code:
        [ "\\" = "${FIRST:0:(-1)}" ] && \
                FIRST="${FIRST}\\"

Thank you
 

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LEARN ABOUT LINUX

vconsole.conf

VCONSOLE.CONF(5)						   vconsole.conf						  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
	   Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
	   a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
	   Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

	   KEYMAP=de-latin1
	   FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							  VCONSOLE.CONF(5)
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