September 13 Jobs

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)

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/42/ Wkiol1x49lvgnxgtaac0ral4-5e601.jpg "width=" 447 "height=" 226 "/>

As a result, the parameter is Haoe

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49lzwbefvaachbv-nw14510.jpg "width=" "height="/>

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/ Wkiol1x49l2zl8b8aabal48xad8836.jpg "width=" 454 "height="/>

Note: There must be a space [–e $filename] in the [] after the IF, and no spaces will go wrong.

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)

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/42/ Wkiol1x49l6jwrvlaadglpvnoxc644.jpg "width=" 469 "height=" 221 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49l-jp5zcaadpcewfqfc878.jpg "width=" 477 "height=" 223 "/>

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

6.1 For Loop

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/ Wkiol1x49mcagm1maacwn9taa3s274.jpg "width=" 471 "height=" 249 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/45/ Wkiom1x48oqamhotaabltqkpgcw388.jpg "width=" 475 "height="/>

6.2 While Loop

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/45/ Wkiom1x48ouxzak6aacwqiimtza806.jpg "width=" 476 "height=" 325 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/45/ Wkiom1x48oztzseqaabfbahkydo282.jpg "width=" 478 "height="/>

6.3 Until cycle

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49mpawsdlaacdgaimn4q014.jpg "width=" 478 "height=" 286 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/ Wkiol1x49mptt4zvaabtx8v03bm283.jpg "width=" 482 "height="/>

7, write a script to achieve the following functions:

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/42/ Wkiol1x49msbmmcoaaa6nulavyq646.jpg "width=" 496 "height=" "/>"

(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;

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49mxwbbsnaaewlmq9zom983.jpg "width=" 502 "height=" 276 "/>

I found that the sign behind the return was wrong and written &, but the result was right.

Note: The parameters of the bash function are not enclosed in parentheses and are written directly

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/wKioL1X49MexoyumAAEKrQQ_A_ W691.jpg "width=" 506 "height=" "/>"

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;

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/42/ Wkiol1x49mejlmplaacig5htc64966.jpg "width=" 511 "height=" 245 "/>

The above can only be judged once, the following will be output

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49mix3fnnaactkttnbzm071.jpg "width=" 506 "height=" 284 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/wKioL1X49MjQJN_ Uaadvv1t7lda009.jpg "width=" 504 "height=" 248 "/>

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

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/42/ Wkiol1x49mmsczzmaab-dhbhmqq885.jpg "Width=" 510 "height=" 217 "/>

Results

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M01/73/42/ Wkiol1x49mnhehzraabssnngel0081.jpg "width=" 514 "height="/>

650) this.width=650; "title=" image "style=" border-left-0px; border-right-width:0px; Background-image:none; border-bottom-width:0px; padding-top:0px; padding-left:0px; padding-right:0px; border-top-width:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/ Wkiol1x49mnwpvy3aabw0jonviw503.jpg "width=" 517 "height="/>

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; about the selection of functions, the size of two values will be provided through interactive input.

Sum

650) this.width=650; "title=" image "style=" border-top:0px; border-right:0px; Background-image:none; border-bottom:0px; padding-top:0px; padding-left:0px; border-left:0px; padding-right:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/45/ Wkiom1x48psjdr5gaad10eefkdu951.jpg "" 549 "height=" 388 "/>

Size sort, big in front

650) this.width=650; "title=" image "style=" border-top:0px; border-right:0px; Background-image:none; border-bottom:0px; padding-top:0px; padding-left:0px; border-left:0px; padding-right:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M00/73/45/ Wkiom1x48psxrosiaad2rhvdiy8771.jpg "557" height= "/>"

Greatest common divisor

650) this.width=650; "title=" image "style=" border-top:0px; border-right:0px; Background-image:none; border-bottom:0px; padding-top:0px; padding-left:0px; border-left:0px; padding-right:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/45/ Wkiom1x48pxzn4txaacnh1t9itc261.jpg "" 577 "height=" 216 "/>

650) this.width=650; "title=" image "style=" border-top:0px; border-right:0px; Background-image:none; border-bottom:0px; padding-top:0px; padding-left:0px; border-left:0px; padding-right:0px "border=" 0 "alt=" image "src=" http://s3.51cto.com/wyfs02/M02/73/42/ Wkiol1x49mycxx4faacoaw1nqdw588.jpg "" 571 "height=" 179 "/>

Least common multiple

The formula is $fint1* $int 2/Greatest common divisor

This also reported wrong.

September 13 Jobs