[Linux command] Empty all files in a folder

This command in one line allows to empty all the files (readable of cours) in a folder

 

find . -type f -exec sh -c '>{}' \;

 

[Git] Git diff without comparaison file mode

Issue when execute git diff command on a file and got :

diff --git a/your_file b/your_file
old mode 100644
new mode 100755

If you see this, it is because the permissions of your_file has changed.
For information, the unix file permission mode(644=rw_r__r__ which means read and write for user, only read for group and only read for others, the same for 755=rwxrw_rw_, x for executable).

To disable the comparaison of file mode, the command to execute :

git config core.filemode false

[Ubuntu] Networking service

Environment : Ubuntu 14.04

Problem :

1. Failure to restart networking service
2. Interface eth# not configured

[Linux command] Tar – Extract only the contents of an archived directory

 

As said the subject, we want to extract only the contents of a tar file to a specific folder.

I have my tar : myTarFolder.tar, my destination folder : destFolder

The structure of my tar file :

If we use only the tar command, we will get :

tar -xf myTarFolder.tar -C destFolder 

If we want to get something like this :

The option that we have to use is :

1. –strip-components=NUMBER : strip NUMBER leading components from file names on extraction

An example of the command :

tar -xf myTarFolder.tar --strip-components=1 -C destFolder

The result :

[Linux command] display tar content with level and without extracting

 
The command allows display the content of a tar file without extracting, and with –exclude option which uses the pattern can also show the level you want to display.

Example :

tar --exclude="*/*/*" -tf yout_tar_file.tar.gz

[Linux command] Tar

tar command example

[Linux command] Find a word in a repository with grep

It’s not always easy to remember the name of file which contains exactly what we want to search.
In linux, we can search without knowing the name of the file with the command grep, and of course we should specify a path.

[ubuntu] WARNING gnome-keyring in lubuntu

If you have met the same problem, this maybe help.

Background :

I installed phpunit in my ubuntu 12.04(the os is lubuntu), the installation passed quite well, but when I launch the command in termianl, I got always this warning :

$ phpunit --version
WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-xAGrk8/pkcs11: No such file or directory
PHPUnit 4.4.5 by Sebastian Bergmann.

[Linux Commands] show file/directory/partition size

# show the partitions sizes 
# (Filesystem, Size, Used, Avail, Use%, Mounted on)
df -h

# show directory size
du -s -h /your_dir_name/

# show file size
du -s -h your_file_name

Tips :

-h is for humain, that you could easily understand the size in
kilobyte, megabyte or gigabyte

-s is for summary, instead of listing all files, it will display
only the total.

[LINUX] ls Command: Sort Files

Linux commands are marvellous !

We can use LS to sort files by name, by size or others methods that you could imagine.

For example,

Suppose you have a list of files in a folder :

– cuibo1
– 1111
– 2222
– 3333
– cuibo2
– cuibo333

And you want all the files in order which begins with cuibo, what you can do is : ls -h | grep “cuibo”

C’est tout !

Here is a blog which talks about sort files by size : http://www.cyberciti.biz/faq/linux-ls-command-sort-by-file-size/