Linux chmod all folders

Change all files and folders permissions of a directory to 644/755

If someone (@animuson) would be so kind to explain me, why this chmod question is off-topic and all others (14,438 results) here aren’t.

Little late, but this one command will also do the accepted answer in one shot: chmod -R a=r,a+X,u+w /your/path

Good question, doesn’t deserve closing. These should rather be moved to a stackoverflow sub site than closed.

@hugoderhungrige it means go ask it on a Server site like: http://superuser.com 😛 but this question helped me here, thanks.

7 Answers 7

One approach could be using find:

for directories

find /desired_location -type d -print0 | xargs -0 chmod 0755 

for files

find /desired_location -type f -print0 | xargs -0 chmod 0644 

just for someone else like me, this doesn’t work instead try sudo find /your/location -type f -exec chmod 644 <> \; for files and sudo find /your/location -type d -exec chmod 755 <> \; for directories

I ran the original solution and it messed up my permissions on files and directories. watch out! the solution on the comment worked, thanks!

What if I want only the subfolder to be chmod 755 when specifying the desired_location ? Because this also will make the parent folder 755

chmod -R u+rwX,go+rX,go-w /path/to/dir 

to ch ange file mod es -R ecursively by giving:

• u ser: r ead, w rite and e X ecute permissions,
• g roup and o ther users: r ead and e X ecute permissions, but not -w rite permission.

Please note that X will make a directory executable, but not a file, unless it’s already searchable/executable.

+X — make a directory or file searchable/executable by everyone if it is already searchable/executable by anyone.

Please check man chmod for more details.

This answer, while neat, does have a problem: a file that is executable before running the command will be executable afterwards. See the answer of @JohnAllsup for a command that does not have this flaw.

The shortest one I could come up with is:

which works on GNU/Linux, and I believe on Posix in general (from my reading of: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html).

1. Set file/directory to r__r__r__ (0444)
2. Add w for owner, to get rw_r__r__ (0644)
3. Set execute for all if a directory (0755 for dir, 0644 for file).

Importantly, the step 1 permission clears all execute bits, so step 3 only adds back execute bits for directories (never files). In addition, all three steps happen before a directory is recursed into (so this is not equivalent to e.g.

chmod -R a=r /foo chmod -R u+w /foo chmod -R a+X /foo 

since the a=r removes x from directories, so then chmod can’t recurse into them.)

Источник

Change Permissions for a Folder and All Its Content in Linux

The Kubernetes ecosystem is huge and quite complex, so it’s easy to forget about costs when trying out all of the exciting tools.

To avoid overspending on your Kubernetes cluster, definitely have a look at the free K8s cost monitoring tool from the automation platform CAST AI. You can view your costs in real time, allocate them, calculate burn rates for projects, spot anomalies or spikes, and get insightful reports you can share with your team.

Connect your cluster and start monitoring your K8s costs right away:

1. Overview

The Linux operating system uses access permissions to maintain security on files directories. When we create a file or directory, Linux assigns default permissions to them. In this tutorial, we’ll discuss different ways of changing permissions for directories and files within the directory.

2. Access Permissions

In many Linux distributions when we create a user, the Linux system creates a group having the same name as the user and assigns that user’s files to that group. The relationship between files and users is that each file can belong to one user and one group.

2.1. Listing File and Directory Permissions

We can use the ls -ld command to show us the permissions on a directory:

$ ls -ld folder drwxrwxr-x 2 baeldung baeldung 4096 Jul 14 08:50 folder

Additionally, we can apply the ls -l command to show us the permissions on the files in a directory:

$ ls -l total 0 -rw-rw-r-- 1 baeldung baeldung 0 Jul 14 08:50 file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 14 08:50 file2 

Moreover, we use ls -l command for a specific file that shows us the permissions on that file:

$ ls -l file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 14 08:50 file1 

2.2. Default Access Permission

When we create a new file or directory, it is created with default access or permission 666 (rw-rw-rw-) or 777 (rwxrwxrwx), respectively. However, we can change the default permission by using umask command. The umask command tells the system what permissions should not be given to a new file as default. The umask is the value that is subtracted from the default permission. By default umask is equal to 0002, and will remove write permissions from files (rw-rw-r–) when creating it:

$ umask 0002 $ echo "test" > file $ ls -l file -rw-rw-r-- 1 baeldung baeldung 0 Jul 14 09:36 file

Also, the new directory will be created with the 775 (rwxrwxr-x) permissions.

3. Change Permission of Directory and File

We can change the permissions of files and directories using the chmod command. There are two ways to change permission:

3.1. chmod Codes

We can use symbolic code plus (+) to add permissions and use minus (–) to remove permissions. Therefore, to give read permission we use +r. In addition, we use +w to give write permission and +x to give execute permission. For removing these permissions, we use -r to remove read permission, -w to remove write permission and -x to remove execute permission.

In addition, we can use octal codes to change the permissions. For example, when using octal codes, we can use numbers instead of r,w,x.

3.2. Change Permission Recursively

Sometimes, we need to change the permissions of a directory and all its subfolders and files. In these cases, we use -R option to recursively apply permission to all subfolders and files:

For example, we want to assign read, write, and execute permissions, to the owner (7) for the current directory and all its subfolders and files. Also, we want to assign read and execute permissions to both group (5) and others (5).

$ ls -ld folder drwxrwxr-x 2 baeldung baeldung 4096 Jul 14 08:50 folder $ ls -l file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 14 08:50 file1 $ chmod -R 751 folder/

$ ls -ld folder drwxr-x--x 2 baeldung baeldung 4096 Jul 14 08:51 folder $ ls -l file1 -rwxr-x--x 1 baeldung baeldung 0 Jul 14 08:51 file1

4. Access Modes

Normally when we run a program it runs with your access level but there are times we should change our password or use programs that need access to system files. We should be able to access /etc/passwd or /etc/shadow to change our password but we should not be able to access other people’s files. In such a case, the Linux system has special bits on each file:

If we set suid on a file, that file will be executed with the access of the owner of the file, and no matter which user is running it. We can set the suid bit with u+s command:

$ ls -l file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 12 11:26 file1

$ chmod u+s file1 $ ls -l file1 -rwSrw-r-- 1 baeldung baeldung 0 Jul 12 11:26 file1

The S character is in the place of executable bit for the user. If we set the sgid bit on a file, members of the same group can run the file. We can set sgid bit with g+s command:

$ ls -l file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 12 11:50 file1

$ chmod g+s file1 $ ls -l file1 -rw-rwSr-- 1 baeldung baeldung 0 Jul 12 11:50 file1

The sgid on a directory will force any new file in that directory to have the sgid of the directory. It is possible to set or unset, the suid and sgid using chmod and +s or -s instead of x. If we set the sticky bit on a file, only the owner of the file can delete it even if all users have to write access to that directory. The sticky bit is identified by t and will be shown on the last bit of a directory. We can set sticky bit with o+t command:

$ ls -l file1 -rw-rw-r-- 1 baeldung baeldung 0 Jul 12 12:07 file1

$ chmod o+t file1 $ ls -l file1 -rw-rw-r-T 1 baeldung baeldung 0 Jul 12 12:07 file1

The T character is in the place of executable bit for the other. Let’s review how we can set these access modes:

access mode | octal | symbolic suid | 4000 | u+s guide | 2000 | g+s sticky | 1000 | t 

We can set the access modes of a directory and all its subfolders and files using -R option:

$ ls -ld folder drwsr-x--x 2 baeldung baeldung 4096 Jul 14 08:51 folder $ ls -l file1 -rwsr-x--x 1 baeldung baeldung 0 Jul 14 08:51 file1

5. Changing Owner and Group

If we need to change the ownership or group of a file or directory, we use the chown command. The general style for changing owner and group is:

chown newuser:newgroup file

$ ls -l file1 -rw-rw-r-T 1 baeldung baeldung 0 Jul 12 12:07 file1

$ chown baeldung:adm file1 $ ls -l file1 -rw-rw-r-T 1 baeldung adm 0 Jul 12 12:07 file1

Also, we can use another format of chown:

$ chown :adm file1 $ ls -l file1 -rw-rw-r-T 1 baeldung adm 0 Jul 12 12:07 file1

We changed the default group (baeldung) to adm group.

We can change the ownership of a directory and all its subfolders and files recursively using -R option:

$ chown -R newuser:newgroup directory

6. Conclusion

In this tutorial, we described permissions on files and directories. Also, we assessed the access modes and changing the ownership and group of files and directories.

Источник