Grep is one of the most useful command in Linux. grep stands for global regular expression print. Its receives output match the word.

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The below scripts shows output number of days between two days. there are different format are on this post with example,

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Find is an one of the versatile command and very useful to searches files, directory tree hierarchy on Linux and Unix. It's have many options and types for searching files from the directories. The following commands given different outputs,

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TOP command is very helpful to displying current running on system status. Update and display top CPU processes periodically. We can view different types of processing status by using keys.

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​du command is very simple and useful for Summarize and estimate files, directories space usage on Linux or Unix system. Can get different types of disk usage information. Also show usage of each FILE, recursively for directories.

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On Unix or Linux use shell scripting If you could not calculate string, we can convert string to integer type,

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You may get an error when execute shell script in linux based system, bad interpreter in Linux.

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