bug#699: grep in eshell incorrect

[xah lee]

The “grep” utility in “eshell” is incorrect. Here's is a  
eshell log that illustrate it:

------------------------------

Welcome to the Emacs shell

~/web/emacs $ which grep
eshell/grep is a compiled Lisp function in `em-unix.el'
~/web/emacs $ ls | grep lin
elisp_link_report.el                        modernization.html
elisp_link_report.el~
modernization_html_mail.html
elisp_link_report.html
modernization_meta_key.html
elisp_make_link.html                        ms_keyboard
emacs_installing_packages.html              wrap-url2.html.gz
emacs_manual_problem.html                   xah_emacs_linkify.el
emacs_n_unicode.html                        xah_emacs_linkify.el~
~/web/emacs $

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  Xah
∑ http://xahlee.org/

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