10-06-2014
Yes, grep is right between echo_old and mkdir_old.
It appears that you have a mayor issue with symlinks in general, since it is not only grep, but all those showing in red, plus some indication base on your first attachment, /usr/local/bin
At this time, with the given information, if I have to guess, I'll say someone broke it playing around renaming files from the coreutils package. echo, mkdir, cp has been renamed to `_old'. These are all coreutils files and guess what file is also part of coreutils? ln (/bin/ln is for symbolic links)
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REALPATH(1) User Commands REALPATH(1)
NAME
realpath - print the resolved path
SYNOPSIS
realpath [OPTION]... FILE...
DESCRIPTION
Print the resolved absolute file name; all but the last component must exist
-e, --canonicalize-existing
all components of the path must exist
-m, --canonicalize-missing
no path components need exist or be a directory
-L, --logical
resolve '..' components before symlinks
-P, --physical
resolve symlinks as encountered (default)
-q, --quiet
suppress most error messages
--relative-to=DIR
print the resolved path relative to DIR
--relative-base=DIR
print absolute paths unless paths below DIR
-s, --strip, --no-symlinks
don't expand symlinks
-z, --zero
end each output line with NUL, not newline
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by Padraig Brady.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report realpath translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
readlink(1), readlink(2), realpath(3)
Full documentation at: <http://www.gnu.org/software/coreutils/realpath>
or available locally via: info '(coreutils) realpath invocation'
GNU coreutils 8.28 January 2018 REALPATH(1)