Bash Shell Summary and examples

First, homework (exercise) content:

1. Describe the operation principle of shell program (can be attached with necessary graphic instructions);

2, summarize all the knowledge points involved in shell programming (such as: variables, grammar, command status, etc., to take the picture of Yo);

3, summarize the course of all the circular statement, the use of conditional judgment and related examples; (if (jpg|png is not exist); echo "You say a XX")

4. Write a script: If a path does not exist, it is created as a directory; otherwise it is present and the content type is displayed; (Don't doubt it's that simple)

5, write a script to complete the following functions; Judging the given two values, which is the big or small; the method of the given number: script parameter, command interaction; (still so simple using read)

6, the sum of all the odd numbers within 100 (at least 3 methods. Yes, this is our assignment. ^_^)

7, write a script to achieve the following functions:

(1) Pass two text file path to script;

(2) Show the number of blank lines in two files and their blank lines;

(3) Show the total number of files in two files and their total number of rows;

8. Write a script

(1) Prompt the user to enter a string;

(2) Judgment:

If the input is quit, exit the script;

Otherwise, the string content of its input is displayed;

9, write a script, print 2^n table; n equals the value entered by a user; (Sorry, I'm naughty)

10, write a script, write a few functions: function 1, to achieve the sum of two numeric values, function 2, take a given two numeric value of greatest common divisor, function 3, take a given two numeric value of least common multiple; the selection of the function, two values will be entered through the script parameters.

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Bash Shell Summary and examples