Shell scripting prerequisite #5

Regular expressions ,grep,sed and awk.

Regular expressions :regular expression is a pattern describing a certain amount of text

grep : searches the named input FILEs {or standard input if no files are named} given a PATTERN grep prints the matching lines.

sed :stream editor for filtering and transforming text

awk: pattern scanning and processing language.

As each name you just came across is so vast , they can run to pages even volumes of books,so rather digging all the details and reinventing the cycle , this ends the prerequisites and the next coming posts will be using them , you will get to know as you use it , rather than dry theory , lets do some juicy coding :)

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