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 DEBIAN

surfraw-update-path

SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME

       surfraw-update-path - updates PATH in shell config files

SYNOPSIS

       surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL]

DESCRIPTION

       surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file.

       Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es

       Don't forget to login again or source your login files for it to take effect.

OPTIONS

       -check
	   Checks to see if the surfraw config code is present.  This is the default.

       -add
	   Adds the surfraw config code.

       -remove
	   Removes the surfraw config code

       -sys
	   Updates the system-wide shell config instead of the user.  Must be done as root.

       -shell=SHELL
	   Selects the shell to configure. Defaults to the value of the $SHELL environment variable.

	   Currently supported shells are:

	   sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es.

       -all
	   Attempts to configure the startup files for all known shells

       -help
	   Gives a usage message

RETURN VALUE

       -check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error.

       All other options return 0 on success, or 2 on error.

ENVIRONMENT

       SHELL
	   Used to determine which shell to configure, if -shell is not given.

       HOME
	   Used to find users config files.

       ENV Used by posix-compliant shells to specify a startup rc file.

       ZDOTDIR
	   Used to find user config files for zsh. If not set, defaults to HOME.

SEE ALSO

       surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1)

AUTHOR

       Ian Beckwith <ianb@erislabs.net>

perl v5.12.4							    2011-07-12						    SURFRAW-UPDATE-PATH(1)