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How can I "whitelist"/output only the (ENglish) a-z;A-Z;0-9;| chars and space in ksh/OpenBSD 5.3?

$ echo 'ASDF"`date`ew � kd A | A'
ASDF"`date`ew � kd A | A
$ echo 'ASDF"`date`ew � kd A | A' | MAGIC
ASDFdateew  kd A | A

So Q: MAGIC is needed :)

UPDATE:

echo 'a|d' | LC_ALL=EN tr -dc '[:alnum:][:space:]|'
a|d

This works in console, but If I put it in a CGI script then it outputs this: 

a7Cd

Why?

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  • 2
    Your CGI script sctually outputs a%7Cd. Maybe you should post a separate question if you need help with that. Commented Aug 13, 2013 at 14:29

1 Answer 1

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echo 'áé{D`AS' | LC_ALL=C tr -cd '[:alnum:]|'

(note that it will also remove the newline character appended by echo).

LC_ALL fixes the locale which determines what characters are and which of them are considered letters or numbers. In the C locales, characters are single-bytes and alnums are the ASCII characters A to Z, a to z and 0 to 9.

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  • what is LC_ALL? + whoops, great.. "|" will be needed too.. Commented Aug 13, 2013 at 9:48

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