On 25-Apr-08, at 10:19 AM, Bill Watson wrote:
Ok, maybe I missed a memo 5-10 years ago, but why does
# ls [A-Z]*
And
# ls | grep [A-Z]
give different results (the filenames are either upper or lower case
- not
mixed in the example).
Why does [A-Z] mean AbBcCdD in ls while it means ABCD in grep?
One is bash path globbing, as defined in the bash manpage. The other
is a proper regular expression, as defined in the regex manpage.
Generally, most applications follow the regex convention, but file
operations follow bash globbing in bash - "*", for example, means all
files, ".*" would be all files beginning with ".", while in regular
expressions, these have different functions (".*" is 0 or more
instances of any character).
--
Ken Snider
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