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Why grep 2.7 complains of incorrect character in /etc/profile.d/lang.csh in Red Hat Enteprise Linux?

Solution Verified - Updated 2011-11-30T21:00:09+00:00 -

Issue

The character class used in the grep command on line 6 of /etc/profile.d/lang.csh is [:blank:], the correct representation should be either [[:blank:]] or [[:space:]]. With version 2.7 of GNU grep, the following warning is issued:
```
grep: character class syntax is [[:space:]], not [:space:]
```
This problem does not occur with the version of grep included in Red Hat Enterprise Linux 4 and 5.

Environment

Red Hat Enterprise Linux 4 or 5
grep-2.7 (compiled by customer)

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