[ale] sed head scratcher

[lists at serioustechnology.com (Geoffrey)]

Jim Kinney wrote:
> breakout the greybeards....
> 
> 
> I have a pile of text lines that need to have a certain portion
> transposed from upper case (windows dweebs did the hostnames) to lower
> case.
> 
> So many lines like:
> 
> 192.168.0.2 MACHINE102
> 192.168.3.4  MACHINE304 FredsBox
> 10.0.2.3   MACHINE599  TestingSystemB
> etc
> 
> So varying IP address then varying spaces then upper case name with
> digits then varying spaces and sometimes followed by other name with
> mixed case.
> 
> I want to ONLY lower case the names after the IP address, not anything
> else in the line.
> 
> Here's what I have so far:
> 
> cat /etc/hosts | sed '/ [A-Z]{7}[0-9]{1,3}/ y/[A-Z]/[a-z]/'

Sounds like a job for tr:

cat /etc/hosts |tr '[A-Z]' '[a-z]'

-- 
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin