How to append  folders with linux shell script implementation

Posted on 2013-05-11
Last Modified: 2013-05-12

   I have a lot of folders, lets say them directories. I want to add  a folder into those directories using shell script. How can I do? Thanks.
Question by:valgrind
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LVL 68

Expert Comment

ID: 39158617
Do you mean all first level directories below a given root directory?

If so, use this:

cd /root/dir

ls -l |grep ^d |awk '{print "mkdir", $NF "/newdir"}' | sh

Or do you have the directory names in a file, let's say "dirlist"?

Then use this:

xargs -I{} mkdir "{}/newdir" < dirlist

Author Comment

ID: 39158648
I am unfamiliar with shell script, but I suppose it must use for loop,Am I wrong? Let me explain my aim giving an example:

 I have  many folders with various names.:
/<  directory1_with_nameN >

I want to add a specific folder, which is named "myfolder" , into each of those folders.
I hope it makes sense.
How can I do it?
LVL 68

Expert Comment

ID: 39158660
There are implicit loops in my commands.

The first one prints out the mkdir command for every directory found and pipes it to sh for execution, and xargs in the second suggestion runs an implicit loop over the lines contained in the input file.

Your example doesn't specify a criterion which directories to process.

Every directory under a given folder? Down the whole tree or only the first level? Every directory starting with a common string?
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Author Comment

ID: 39158698
yes, every directory under a given folder.

Author Comment

ID: 39158703
not with a common string and only first level.

and   I wonder how can it be done down the whole tree:)
LVL 68

Expert Comment

ID: 39158712
OK, to take into account that there might be spaces in directory names let's use "find" and "xargs",
Both have an option to use binary zeroes as field separators ("-print0" resp. "-0") instead of spaces:

find /given/folder -type d -maxdepth 1 -print0 | xargs -0 -i{} echo mkdir "{}/myfolder"

And don't worry, there is a (yet not visible) loop implicitly constructed by "xargs".

To process the whole tree just omit the "-maxdepth 1" option of "find".

Author Comment

ID: 39158719
I think this is doing new directory, and adding it to the folders?
My aim is copying a folder and its contents into to all those folders.
I am doing another work now, so I can not try your solution, sorry for that.
LVL 68

Accepted Solution

woolmilkporc earned 500 total points
ID: 39158744
You wrote "add a folder" - that's ambiguous (to say the least).

Anyway, only a slight enhancement needed:

find /given/folder -type d -maxdepth 1 -print0 | xargs -0 -i{} cp -rp "/path/to/source/myfolder" "{}"

Author Comment

ID: 39158775
Thank you, and sorry for ambiguoity.

I will try, and reply.

Author Comment

ID: 39158817

The script is:

find -type d -maxdepth 1 -print() | xargs -() -i{} cp -rp "cse244directorstr""{}"

I had some errors:

egemen@egemen-VirtualBox:~/cse244gruplar/currentdir$ ./
./ line 2: syntax error near unexpected token `('
./ line 2: `find -type d -maxdepth 1 -print() | xargs -() -i{} cp -rp "cse244directorstr""{}"'
LVL 68

Expert Comment

ID: 39158824

"-print0" and "xargs -0"

where in both cases "0" means the digit "zero"!

And in the below line there must be a space before "{}"! Very important!

... "cse244directorstr"    "{}"

Further, you must specify the start directory for "find",
and shouldn't you specify the full path to the directory to be copied to the target folders?

find /start/dir-type d -maxdepth 1 -print0 | xargs -0 -i{} cp -rp "/path/to/cse244directorstr"  "{}"

Author Comment

ID: 39158872
I thought  start directory       or/and   "path/to......" can be evaluated as current directory if I omit relevant expressions. I was wrong. If these two were current directory, it would be nice.

But somehow it is usefull for me . I separated folders and "myfolder" so that they are not in current directory together.

Thank you.
LVL 68

Expert Comment

ID: 39159223
"find" requires a starting directory, there's no default. To specify the current directory use the dot ".":

find . -type d ... ...

In the second case you're right - without a path specification the current directory will be searched.

Thx for the points!


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