Problem with sed - It misinterprets | (pipe).

From: LOEWENTHAL Simon (sloewenthal_at_gemini.edu)
Date: 05/31/05

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    Date: Tue, 31 May 2005 11:14:57 -0400
To: Sun Mangers <sunmanagers@sunmanagers.org>

    Dear all Sed madmen,

    I'm trying to write something that sets the encrypted field in the
    shadow file to *LK*, but sed will choke whenever the field has a / in
    it, so I wrote something to nest sed inside sed with cut so that it
    replaces instances of / with /\

    However, sed chokes when interpreting the |. I have tried putting ' and
    ` in all the places I can think of, but it usually makes it worse.

    Cut the encrypted password out and then get gsed to replace the / with
    \, which work fine.

    Cat shadow.t

        GogunE:ndY3rmE/bkxt.:12180::::::

        echo `cut -d: -f2 shadow.t`|gsed -s 's/\//\\\//g'

    What it correctly produces,

        ndY3rmE\/bkxt.

    Finally I use gsed to replace the earlier output with *LK*.

         gsed -e 's/'`echo `cut -d: -f2 shadow.t`|gsed -s
    's/\//\\\//g'`'/\*LK\*/' <shadow.t

    Then it chokes,

        ./test: syntax error at line 1: `|' unexpected

    Regards, S.

    PS. I'm sorry that this is not Sun specific, but I think that there are
    plenty of sed users in the audience, but I've been at this for the past
    5 hours and am starting to doubt my sanity. 

    -- 
ISG/Gemini/AURA
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