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How to create a command sequence for this?

13 posts in this topic

Posted

A. Write a command sequence, to create a directory structure like follows:

1. level 1 - 4 directories with random alphanumeric name of 8 characters each directory

2. level 2 - each level 1 directory will have 3 directories - yes, no and yesorno

3. level 3 - each level 3 directory will have 9 directories with directory named in series 1-9 e.g. [1, 2, 3...9]

4. level 4 - each level 4 directory will have 3 directories - yes, no and yesorno

5. all directories at each level will have a text file named abc.txt with random alpha numeric text of 200 characters

Can someone shed a light in a right direction that will help me to achieve this?

Thanks !!

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Posted

I have a background in C#/VB.NET, so that will influence my answer:

You'll need a few nested For-Next loops to create the exact number of directories you need. You'll also need a pseudo-random number generator to generate the random alphanumeric characters, and to make the "yes, no, or yesorno" directories. The 1-9 directories are easy.

If you're using .NET, use a TextWriter to write the text files.

Have fun!

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Posted

It could be done in pretty much any language, scripting or otherwise, but assuming you want it in bash:


#!/bin/bash


function random_chars ()

{

	tmp=$( < /dev/urandom tr -dc A-Za-z1-9 | head -c $1 )

	eval $2=$tmp

}


function create_abc ()

{

	local rand=''

	local file=$1'/abc.txt'


	random_chars 200 rand

	echo $rand > $file

	echo $file

}


function create_1to9 ()

{

	for i in 1 2 3 4 5 6 7 8 9

	do


		wd=$1'/'$i

		mkdir $wd

		echo $wd


		create_abc $wd

		create_yesno $wd 0


	done

}


function create_answer ()

{

	local answer=$1'/'$2


	mkdir $answer

	echo $answer


	create_abc $answer  


	if [ $3 == 1 ]

	then

		create_1to9 $answer

	fi

}


function create_yesno ()

{

	create_answer $1 'yes' $2

	create_answer $1 'no'  $2

	create_answer $1 'yesorno' $2

}


function create_dirs ()

{

	local ret=''


	for i in 1 2 3 4

	do

		random_chars 8 ret


		dir=$1'/'$ret

		mkdir $dir

		echo $dir


		create_abc $dir

		create_yesno $dir 1	  


	done


}


function main ()

{

	create_dirs $1

}


main $1


Copy/echo it into a file, chmod +x it. Then to run:

./script targetdir

targetdir is where you want it to create the directory structure. I just used '.' ( current directory ) for testing.

My bash script knowledge is pretty awful, so I'm sure someone else could do better.

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Posted

I have a background in C#/VB.NET, so that will influence my answer:

You'll need a few nested For-Next loops to create the exact number of directories you need. You'll also need a pseudo-random number generator to generate the random alphanumeric characters, and to make the "yes, no, or yesorno" directories. The 1-9 directories are easy.

If you're using .NET, use a TextWriter to write the text files.

Have fun!

That's about as efficient as using ice cream for a fire guard ;)

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Posted

There was a slight bug in random_chars () that caused it to output the abc.txt file incorrectly. Change it to:

Edit: Actually, the tmp variable is superfluous. Just remove it entirely.


function random_chars ()

{

	eval $2=$( < /dev/urandom tr -dc A-Za-z1-9 | head -c $1 )

}

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Posted

Thanks for your responses.. . .

I came up with following command sequence :::::::::::::


bash$ for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`; done


bash$ for i in `ls`; do `mkdir -p $i/{yes,no,yesorno}/{1..9} `; done


bash$ find . -type d -exec touch {}/abc.txt  \;

Now I am stuck at creating "yes,no,yesorno" directory in directories with name 1 - 9

This is what I tried ::

bash$ for i in $(find . -type d -name [1-9]); do `mkdir -p /{yes,no,yesorno}`;done

but its prompting with error "permission denied"

What am I missing?

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Posted

change the permission of the folder

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Posted

Thanks for your responses.. . .

I came up with following command sequence :::::::::::::


bash$ for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`; done


bash$ for i in `ls`; do `mkdir -p $i/{yes,no,yesorno}/{1..9} `; done


bash$ find . -type d -exec touch {}/abc.txt  \;

Now I am stuck at creating "yes,no,yesorno" directory in directories with name 1 - 9 This is what I tried :: bash$ for i in $(find . -type d -name [1-9]); do `mkdir -p /{yes,no,yesorno}`;done but its prompting with error "permission denied" What am I missing?
What's happening is you are trying to create the folders /yes, /no, and /yesorno, which are in the root directory of your filesystem. What you want is to modify that line to be

for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno}`; done

Basically, you're missing that $i which would make the {yes,no,yesorno} a subdirectory of your random folders as opposed to a subdirectory of the root directory.

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Posted

What's happening is you are trying to create the folders /yes, /no, and /yesorno, which are in the root directory of your filesystem. What you want is to modify that line to be


for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno}`; done

Basically, you're missing that $i which would make the {yes,no,yesorno} a subdirectory of your random folders as opposed to a subdirectory of the root directory.
Thats what I needed. .. . .Thanks.. . But now there are some other complications I am facing,,, :( I need to redirect the output to output.txt and error to error.txt I came up with this:

for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`<&- 2>$HOME/error.txt; done


for i in `ls` ; do `mkdir -p $i/{yes,no,yesorno}/{1..9}` <&- 1>$HOME/output.txt 2>>$HOME/error.txt; done


for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno} <&- 1>$HOME/output.txt 2>>$HOME/error.txt `;done


for i in $(find . -type d); do `< /dev/urandom tr -dc A-Z0-9 | head -c200 > $i/abc.txt <&- 2>>$HOME/error.txt `; done 

After that, I need to join all the command sequences into one single command.

When I tried joining the commands and placing done at the end, it seems to be something is missing.. please help

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Posted

'done' indicates the end of a loop, not the end of a command sequence. 'joining' the command should be as simple as placing them all on one line with semicolons between them. Based on the four commands you quoted in your last post, your final command should look something like this:


for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`<&- 2>$HOME/error.txt; done; for i in `ls` ; do `mkdir -p $i/{yes,no,yesorno}/{1..9}` <&- 1>$HOME/output.txt 2>>$HOME/error.txt; done; for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno} <&- 1>$HOME/output.txt 2>>$HOME/error.txt `;done; for i in $(find . -type d); do `< /dev/urandom tr -dc A-Z0-9 | head -c200 > $i/abc.txt <&- 2>>$HOME/error.txt `; done

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Posted

'done' indicates the end of a loop, not the end of a command sequence. 'joining' the command should be as simple as placing them all on one line with semicolons between them. Based on the four commands you quoted in your last post, your final command should look something like this:


for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`<&- 2>$HOME/error.txt; done; for i in `ls` ; do `mkdir -p $i/{yes,no,yesorno}/{1..9}` <&- 1>$HOME/output.txt 2>>$HOME/error.txt; done; for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno} <&- 1>$HOME/output.txt 2>>$HOME/error.txt `;done; for i in $(find . -type d); do `< /dev/urandom tr -dc A-Z0-9 | head -c200 > $i/abc.txt <&- 2>>$HOME/error.txt `; done

Thank you. . .. Finally. .. :)

for i in $(seq 4); do mkdir `< /dev/urandom tr -dc A-Z0-9 | head -c8`<&- 2>$HOME/error.txt; done;for i in `ls`; do `mkdir -p $i/{yes,no,yesorno}/{1..9}` <&- 1>$HOME/output.txt 2>>$HOME/error.txt; done;for i in $(find . -type d -name [1-9]); do `mkdir -p $i/{yes,no,yesorno}` <&- 1>$HOME/output.txt 2>>$HOME/error.txt; done;for i in $(find . -type d); do `< /dev/urandom tr -dc A-Z0-9 | head -c200 > $i/abc.txt` <&- 2>>$HOME/error.txt; done

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Posted

I tried to edit the above post but can't see the edit button, ,, :(

btw, can we redirect the output of mkdir command to a file? i.e output.txt . . .coz its always empty.

And when I execute the command twice, I get an error "Unable to create a directory abc.txt"

How can I make this command to be executed "n" number of times?. . .I don't want to loop it . .. I need to execute the same command on the previous output it generated.

Now I can see the edit button. .

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Posted

I think your problem is that mkdir doesn't actually output anything to screen unless it encounters an error; so redirecting its output to a file is virtually useless. If you really want it to print a message, try passing it the -v switch. As for the second part of your question about executing the command 'n' times, I have no idea what you are talking about. My best guess is that you want to create a directory inside of a directory that does not yet exist. To create any intermediate directories you could pass mkdir the -p switch. Putting all of the above together your command may look something like the following:


mkdir -pv 'rar' 1>output.txt 2>&1

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