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Full Discussion: Help - Bash Script
Top Forums UNIX for Beginners Questions & Answers Help - Bash Script Post 303035474 by Don Cragun on Saturday 25th of May 2019 01:37:09 PM
Old 05-25-2019
Quote:
Originally Posted by Stefano
Hi Don and thank you so much for answer. I solved. The code posted is used, in that case, as a regular expression for a date in the format YYYY-MM-DD where YYYY is the current year, less the value of the variable {i}.

But now, I have one other issue very very difficult to understand (for me, naturally).

I would know what does mean this code
Code:
ls ${BACKUPDIR} | grep -v -e "$(echo -n $(listUniqueBackups) | sed "s//\\\|g")"

...
... in particular the two sections | grep -v -e "$echo -n ... and ... sed "s//\\\|g"

Thanks in advance.

PS The code is a command of linux bash script !
I don't have access to a Linux system to test this out, but I would expect the sed command at the end of the pipeline in your command substitution to fail due to a missing search pattern or a missing replacement pattern terminator. Are you sure you showed us the exact command that is being used?

On a standards conforming system, using echo -n output as input to sed would produced unspecified results, but processing an incomplete line of input might work with a GNU sed utility.

If you want our help with puzzles like this, please show us the relevant input variable contents (e.g. $BACKUPDIR and $listUniqueBackups).

In this case, please also show us all of the output produced when you run the command:
Code:
echo -n $(listUniqueBackups) | sed "s//\\\|g"

 

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LEARN ABOUT CENTOS

gst-complete

gst-complete-0.8(1)						   User Commands					       gst-complete-0.8(1)

NAME

       gst-complete-0.8, gst-complete - perform bash completion for gst-launch command lines

SYNOPSIS

       complete -Cgst-complete-0.8 gst-launch

       gst-complete [--gst-list-mm] [--gst-mm=string] [--print]

DESCRIPTION

       gst-complete-0.8 enables bash to provide context-sensitive tab completion for gst-launch command lines. See gst-launch(1) for the syntax of
       gst-launch command lines.

       You must have a version of bash that supports programmable completion. Such versions of bash provide the complete built-in command.

       gst-complete is a wrapper script that runs the latest installed version of gst-complete-X.X. For example, if both gst-complete-0.7 and gst-
       complete-0.8 are installed on your system, gst-complete runs gst-complete-0.8.

OPTIONS

       The following options are supported by gst-complete-0.8 and gst-complete:

       --help	       Display detailed usage message. You can also use -? to specify this option.

       The following options are supported by gst-complete only:

       --gst-list-mm   List found major/minor versions. This option displays the versions that are available.

       --gst-mm=string Force  major/minor  version.  This  option  enables you to specify a specific version to run, if you do not want to run the
		       default version.

       --print	       Print wrapped command line. This option displays the command that will be run, and then runs the command.

EXAMPLES

       Example 1: Generating the Registry of Available Plugins by Running gst-compprep

       Run the following command in your .bash_profile or other appropriate place:

       example% complete -C gst-complete-0.8 gst-launch

       Example 2: Running the Wrapper Script and Displaying the Command Name

       example% gst-complete --print
       /usr/bin/gst-complete-0.8

FILES

       The following files are used by this application:

       /usr/bin/gst-complete-0.Executable for bash completion for gst-launch

       /usr/bin/gst-complete   Wrapper script that runs the latest installed version of gst-complete-X.X

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-media		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gst-compprep(1), gst-feedback(1), gst-inspect(1), gst-launch(1), gst-launch-ext(1), gst-md5sum(1), gst-register(1), gst-thumbnail(1),  gst-
       typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3)

NOTES

       Original man page written by the GStreamer team at http://gstreamer.net/.

       Updated by Brian Cameron, Sun Microsystems Inc., 2004.

SunOS 5.10							    14 Oct 2004 					       gst-complete-0.8(1)
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