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Homework and Emergencies Homework & Coursework Questions Issue with tr, removing [:alnum:] Post 302510378 by Corona688 on Sunday 3rd of April 2011 12:25:20 PM
Old 04-03-2011
The file permissions certainly have nothing to do with it. It'd tell you "permission denied" if you didn't have access. The sledgehammer 777 is an extremely bad habit that creates far more problems than it ever solves.

tr -d ought to be able to do it. It may not be able to understand '[:alnum:]' though, you might have to just spell it out for it.

Code:
tr -d '[a-zA-Z0-9]'

 

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spell(1)						      General Commands Manual							  spell(1)

NAME
spell, spellin, spellout - Finds spelling errors SYNOPSIS
spell [-b] [-i | -l] [-v | -x] [-d hash_list] [-s hash_stop] [-h history_list] [+word_list] [file...] spellin [list] [number] spellout [-d] list The spell command reads words in file and compares them to those in a spelling list. Default files contain English words only, but you can supply your own list of words in other languages. STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: spell: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
[Tru64 UNIX] The following options are for the spell command only. Checks for correct British spelling. Besides preferring centre, colour, programme, speciality, travelled, and so on, this option causes spell to insist upon the use of the infix -ise in words like stan- dardise. [Tru64 UNIX] Specifies hash_list as the alternate spelling list. The default is /usr/lbin/spell/hlist[ab]. [Tru64 UNIX] Speci- fies history_list as the alternate history list that is used to accumulate all output. The default is /usr/lbin/spell/spellhist. [Tru64 UNIX] Suppresses processing of included files through the and troff macros. If the -i and -l options are both specified, the last one of the two options entered on the command line takes effect. [Tru64 UNIX] Follows the chain of all included files (.so and spell(1)
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