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Full Discussion: Ignoring mv commands "cannot stat" error ?
Top Forums Shell Programming and Scripting Ignoring mv commands "cannot stat" error ? Post 302520612 by mirni on Sunday 8th of May 2011 05:11:54 PM
Old 05-08-2011
Well, the message you're getting is printed on stderr (as opposed to stdout, which is where normal output goes). If you want to just get rid of that stream, this is the easiest way.

Many times it can be useful to ignore all output and just check the return value of command to see whether it exited normally or not:
Code:
grep string someFile &>/dev/null 
case $? in 
  0) echo "found it";;
  1) echo "not found, someFile exists";;
  2) echo "someFile does not exist";;
esac

Redirection &> will redirect both stdout and stderr.

You can specify where does this message go, by manipulating the stderr stream. Stderr is associated by a file descriptor 2 (/dev/fd/2 in bash).

Other than redirecting it to /dev/null, you could redirect it to a file, to capture the stderr, like
Code:
command 2> myErrs.log

or '2>>' to append.

You can also process the stderr by piping it to another command. Reply by alister in this post explains this and might be of interest to you:
https://www.unix.com/shell-programmin...r-process.html

Other than processing what goes OUT of stderr, you might wanna write INTO stderr. Like this:
Code:
$echo "This goes to stderr" >&2

good luck!
mirni
Last edited by mirni; 05-09-2011 at 04:50 AM..
 

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LEARN ABOUT CENTOS

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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