input file

How do I count lines if given word or string matches for each input file under Linux or UNIX operating systems?

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Q. How do I sort date type of data stored in a text file which is in following sample format:

Code         Date          TIME
HOS05	23/12/2008	10AM
HOS06	15/12/2008	2PM
HOS62	29/12/2008	10AM
HOS64	23/12/2008	2PM
HOS70	26/12/2008	10AM
ZFT01	06/12/2008	10AM
HOS73	11/12/2008	2PM
MHOS051	05/12/2008	10AM
MHOS041	20/12/2008	2PM
MHOS042	27/12/2008	2PM
MHOS053	11/12/2008	10AM
MHOS043	30/12/2008	2PM

How do I sort data date and time wise?

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How do I replace a string with another string in all files? For example, ~/foo directory has 100s of text file and I’d like to find out xyz string and replace with abc. I’d like to use sed or any other tool to replace all occurrence of the word.

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