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Full Discussion: Limit the number of characters in bash output
Top Forums Shell Programming and Scripting Limit the number of characters in bash output Post 302920785 by Shadow_Reaper on Sunday 12th of October 2014 10:57:59 PM
Old 10-12-2014
Limit the number of characters in bash output
Hi, I need some help with this:
I'm making a script which does a couple of things with image files. The script is supposed to echo the number of each image it is processing like this:

Code:
Processing image1.jpg

The problem is with images with very long filenames, so I want to know how to limit the numer of characters of the output (maybe with sed or awk, but I prefer sed if it's possible).
I want to be able to turn this:

"Processing a-very-very-very-long-crazy-filename.jpg"

into this:

Code:
Processing a-very-very-ve...

It's important to say that this limitation will be done over a variable and not a file.
I came across this solution which seems to work but it is applied on a file and not on a variable, and I need it to be applied on a variable

I'm doing this as part of a progress bar solution. I want it to be like pacman progress bar when downloading packages to be updated except that I want it to inform each processed file and the operation percentage in one line. I already accomplished this, the only things remaining are the one I'm asking for, and the animation of the progress bar to make it look like the pacman one.

Thanks in advance. Shadow_Reaper

---------- Post updated at 11:57 PM ---------- Previous update was at 11:53 PM ----------

The image I posted was intended to show the url of the solution. I will post it through this reply so that it can be seen

[THIS WEBSITE]

/shell-programming

-and-scripting/241327-li

mit-string-length-sed [.HTML HERE]

The actual solution is the first reply but I need to be able to do this on a variable rather than a file.
Last edited by Don Cragun; 10-13-2014 at 12:01 AM.. Reason: Chane IMG tag to URL tag.
 

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LEARN ABOUT CENTOS

ttk::progressbar

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

__________________________________________________________________________________________________________________________________________________

NAME

       ttk::progressbar - Provide progress feedback

SYNOPSIS

       ttk::progressbar pathName ?options?
_________________________________________________________________

DESCRIPTION

       A  ttk::progressbar  widget shows the status of a long-running operation.  They can operate in two modes: determinate mode shows the amount
       completed relative to the total amount of work to be done, and indeterminate mode provides an animated display to let the  user	know  that
       something is happening.

STANDARD OPTIONS

       -class		     -cursor		  -takefocus
       -style

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

WIDGET-SPECIFIC OPTIONS
       [-orient orient]  One  of horizontal or vertical.  Specifies the orientation of the progress bar.  [-length length] Specifies the length of
       the long axis of the progress bar (width if horizontal, height if vertical).  [-mode mode] One of determinate  or  indeterminate.   [-maxi-
       mum maximum]  A	floating  point  number specifying the maximum -value.	Defaults to 100.  [-value value] The current value of the progress
       bar.  In determinate mode, this represents the amount of work completed.  In indeterminate mode, it is interpreted  modulo  -maximum;  that
       is,  the  progress bar completes one "cycle" when the -value increases by -maximum.  [-variable variable] The name of a global Tcl variable
       which is linked to the -value.  If specified, the -value of the progress bar is automatically set to the value of the variable whenever the
       latter  is  modified.  [-phase phase] Read-only option.	The widget periodically increments the value of this option whenever the -value is
       greater than 0 and, in determinate mode, less than -maximum.  This option may be used by the current theme to provide additional  animation
       effects.

WIDGET COMMAND

       pathName cget option
	      Returns the current value of the specified option; see ttk::widget(n).

       pathName configure ?option? ?value option value ...?
	      Modify or query widget options; see ttk::widget(n).

       pathName identify x y
	      Returns the name of the element at position x, y.  See ttk::widget(n).

       pathName instate statespec ?script?
	      Test the widget state; see ttk::widget(n).

       pathName start ?interval?
	      Begin  autoincrement  mode:  schedules  a  recurring  timer event that calls step every interval milliseconds.  If omitted, interval
	      defaults to 50 milliseconds (20 steps/second).

       pathName state ?stateSpec?
	      Modify or query the widget state; see ttk::widget(n).

       pathName step ?amount?
	      Increments the -value by amount.	amount defaults to 1.0 if omitted.

       pathName stop
	      Stop autoincrement mode: cancels any recurring timer event initiated by pathName start.

SEE ALSO

       ttk::widget(n)

Tk									8.5						       ttk::progressbar(n)
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