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Top Forums Shell Programming and Scripting Triming spaces for any variable Post 302239307 by era on Tuesday 23rd of September 2008 09:12:26 AM
Old 09-23-2008
That only worked because you forgot to properly quote "$a" (at least it doesn't work here; tr does not look at context, and does not understand ^ to mean beginning of line; tr version from GNU coreutils 6.10).
 

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ID(1)								   User Commands							     ID(1)

NAME
id - print real and effective user and group IDs SYNOPSIS
id [OPTION]... [USERNAME] DESCRIPTION
Print user and group information for the specified USERNAME, or (when USERNAME omitted) for the current user. -a ignore, for compatibility with other versions -Z, --context print only the security context of the current user -g, --group print only the effective group ID -G, --groups print all group IDs -n, --name print a name instead of a number, for -ugG -r, --real print the real ID instead of the effective ID, with -ugG -u, --user print only the effective user ID --help display this help and exit --version output version information and exit Without any OPTION, print some useful set of identified information. AUTHOR
Written by Arnold Robbins and David MacKenzie. REPORTING BUGS
Report id 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/> Report id translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2010 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 id is maintained as a Texinfo manual. If the info and id programs are properly installed at your site, the com- mand info coreutils 'id invocation' should give you access to the complete manual. GNU coreutils 8.5 February 2011 ID(1)
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