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Full Discussion: HOw to find special characters
Top Forums Shell Programming and Scripting HOw to find special characters Post 302599349 by alister on Thursday 16th of February 2012 10:25:17 PM
Old 02-16-2012
Quote:
Originally Posted by chihung
"od -c" can help you identify those non-printable character and represent them in octal. If you want to only print those lines:
Code:
while read line
do
  echo "$line" | od -c | grep -w -e '[0-7][0-7][0-7]' > /dev/null && echo "$line"
done < your-input-file

That echo statement cannot be relied upon. What if $line expands to something that looks like a command option? You can't use "--" to explicitly signal the end of option processing. printf %s "$line" is a better approach.

Perhaps it would also be a good idea to suppress od's offset with -An, since the offset's format is unspecified and could possibly be matched by grep.

AWK might be easiest to use since its regular expression flavor is required to support octal escape sequences even within bracket expressions. However, without a definition of "special characters" by the OP, that's just speculation.

Regards,
Alister
Last edited by alister; 02-16-2012 at 11:32 PM..
 

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LEARN ABOUT MOJAVE

ttk::frame

ttk::frame(n)							 Tk Themed Widget						     ttk::frame(n)

__________________________________________________________________________________________________________________________________________________

NAME

       ttk::frame - Simple container widget

SYNOPSIS

       ttk::frame pathName ?options?
_________________________________________________________________

DESCRIPTION

       A ttk::frame widget is a container, used to group other widgets together.

STANDARD OPTIONS

       -class		     -cursor		  -takefocus
       -style

       See the ttk_widget manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS
       [-borderwidth borderWidth]  The desired width of the widget border.  Defaults to 0.  [-relief relief] One of the standard Tk border styles:
       flat, groove, raised, ridge, solid, or sunken.  Defaults to flat.  [-padding padding] Additional padding  to  include  inside  the  border.
       [-width width]  If specified, the widget's requested width in pixels.  [-height height] If specified, the widget's requested height in pix-
       els.

WIDGET COMMAND

       Supports the standard widget commands configure, cget, identify, instate, and state; see ttk::widget(n).

NOTES

       Note that if the pack, grid, or other geometry managers are used to manage the children of the frame, by the GM's requested size will  nor-
       mally take precedence over the frame widget's -width and -height options.  pack propagate and grid propagate can be used to change this.

SEE ALSO

       ttk::widget(n), ttk::labelframe(n), frame(n)

KEYWORDS

       widget, frame, container

Tk									8.5							     ttk::frame(n)
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