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Please help me in organizing the data in UNIX

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Top Forums Shell Programming and Scripting Please help me in organizing the data in UNIX
# 8  
Old 07-16-2015
You need to differentiate between shell's pattern matching (e.g. man bash), where * is a wild card character, and "POSIX.2 regular expressions" (man regex), where . is the wild card char, followed by * , a "repeater" meaning "zero or more occurrences".

_ is an undefined and thus empty variable giving an, as you call it, null substitution. Sort of sloppy programming, saving you from typing one char as opposed to "" .
This User Gave Thanks to RudiC For This Post:
rahul2662
# 9  
Old 07-16-2015
I don't know whether Ravinder is online or away, this may help you

. The period, or dot, matches any single character, including the newline character.

* This symbol means that the preceding regular expression is to be repeated as many times as necessary to find a match

_ is a variable, it contains nothing or it contains NULL because it is not set or defined anywhere before

Syntax : sub(/^.*=/,_) is same as sub(/^.*=/,"")
Last edited by Akshay Hegde; 07-16-2015 at 05:56 AM..
This User Gave Thanks to Akshay Hegde For This Post:
rahul2662
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