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bash: while: command not found? ??

From: Linda Walsh
Subject: bash: while: command not found? ??
Date: Mon, 07 Nov 2011 12:40:43 -0800
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv: Gecko/20100228 Lightning/0.9 Thunderbird/ Mnenhy/

At the # prompt, if I type:

   # <filename cat

it takes filename and pipes it as input into cat.

then, why, when I type:

    # <filename while read ln; do echo $ln; done

do I get...

   bash: syntax error near unexpected token `do'

So I try putting do on a separate line:

   # <filename while read ln
   bash: while: command not found.

hmm...I thought 'while was a builtin?  why can't bash find it?

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