SUMMARY: 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 11:39:58 -0400
To: Sun Mangers <sunmanagers@sunmanagers.org>

    Hi everyone,

    Thank-you all for replying so quickly:
    As Elvio simply put it:

    awk -F":" '{printf("%s:*LK*:%s::::::\n",$1,$3)}' /etc/shadow
    While Luc said,

              egrep -v luc /etc/shadow > /tmp/shadow
            echo 'luc:*LK*:::::::' >> /tmp/shadow
            cp /tmp/shadow /etc/shadow
            rm /tmp/shadow
            chmod 400 /etc/shadow

    For info, I tried using an @ instead of a /, but got the same result,
     gsed -e 's@'`echo `cut -d: -f2 shadow.t`|gsed -s 's@\/@\\\/@g'`'@\*LK\*@' <shadow.t shadow.n
    ./test: syntax error at line 1: `|' unexpected

    Awk wins this time.
    I'd still like to know the sed solution, though.

    Many thanks to you all,
    S.

    LOEWENTHAL Simon wrote:

    > 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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