1 Command - 2 Behaviours and a wrong false message Post: 302931068

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Top Forums Shell Programming and Scripting 1 Command - 2 Behaviours and a wrong false message Post 302931068 by Don Cragun on Friday 9th of January 2015 11:20:28 PM

01-10-2015

Registered User

Try changing:

Code:

check=$(echo "$1" | tr -d [:digit:])

to:

Code:

check=$(echo "$1" | tr -d '[:digit:]')

Double quotes should also work as well as single quotes in this example. (I generally prefer single quotes when quoting constant strings.)

PS
I should have said why the quotes are needed...
The unquoted argument [:digit:] is a pathname bracket expression that changes to a list of files with the single character names :, d, i, g, and t if any such files are present in the directory where you run this command. If you run it in a directory where there are no files matching this pattern, the unchanged pattern is passed to tr as an operand. So, the reason it works sometimes and fails sometimes is the contents of the directory where it is run; not the script used to invoke it.

Last edited by Don Cragun; 01-10-2015 at 12:41 AM.. Reason: Add PS.

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LEARN ABOUT SUSE

false

FALSE(1)							   User Commands							  FALSE(1)

NAME

       false - do nothing, unsuccessfully

SYNOPSIS

       false [ignored command line arguments]
       false OPTION

DESCRIPTION

       Exit with a status code indicating failure.

       --help display this help and exit

       --version
	      output version information and exit

       NOTE: your shell may have its own version of false, which usually supersedes the version described here.  Please refer to your shell's doc-
       umentation for details about the options it supports.

AUTHOR

       Written by Jim Meyering.

REPORTING BUGS

       Report false bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for false is maintained as a Texinfo manual.  If the info and false programs are properly installed  at  your  site,
       the command

	      info coreutils 'false invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								  FALSE(1)