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Shell Programming and Scripting

Delete and retain some characters

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# 1  
Old 05-30-2013
Delete and retain some characters
Ive been trying to google and tried sed and awk. BUt still getting no exact formula.

I would like to know how to parse this at:


From:
Compute Machin Appliance 3.2.9.10000 123456

To:
Compute Machin Appliance 3.2.9.123456
# 2  
Old 05-30-2013
Code:
sed 's/\.[0-9]* /\./g'

This User Gave Thanks to Yoda For This Post:
kenshinhimura
# 3  
Old 05-31-2013
thanks a lot, can you explain the syntax?
thanks
# 4  
Old 05-31-2013
Code:
sed 's/\.[0-9]* /\./g'

\. - Period . is a metacharacter hence escaped to preserve its literal meaning.

[0-9]* - Zero or more occurrence of any digits followed by blank space.

The code is replacing a pattern with period followed by zero or more occurrence of any digits followed by blank space to period:
Code:
Compute Machin Appliance 3.2.9.10000 123456 ---> Compute Machin Appliance 3.2.9.123456

This User Gave Thanks to Yoda For This Post:
kenshinhimura
# 5  
Old 05-31-2013
thanks a lot
# 6  
Old 05-31-2013
With awk, using regex from Yoda
Code:
awk '{sub(/\.[0-9]+ /,".")}1'

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