access permission in linux - linux

I m running linux on my android phone using gnuroot debian.I had installed gcc compiler.I had
make a c program on linux and compiled it with
command
g++ helloworld.c -o helloworld
I got helloworld file within the same directory and executing it with command
./helloworld
I got message "bash : ./hello world: Permission denied"
then I use chmod u+x helloworld
then I again execute it with same above command again I got same message permission denied
then I use command for changing the permission
sudo chmod u+x helloworld
Then I again got the same message permission denied
when I m listing the file after using chmod
I got there is no change in permission
Plz help I will be very grateful to you

Android mounts /storage/emulated with the noexec parameter, which means that files there can't be executed regardless of permissions. You need to put your binary somewhere not under there (and not under somewhere that's just a symlink to there).

Related

Cannot create file on ubuntu bash shell in my window machine

when I was try to use touch command on my ubuntu bash shell and in my Desktop folder /mnt/c/Users/Public/Desktop$ it give me this touch: cannot touch 'test.txt': Permission denied error.
You may not have access to the /mnt/c/Users/Public/Desktop directory as default
Run:
ls -ld /c/mnt/Users/Public/Desktop
to see whether you have write permissions as default. If you don't run:
sudo chmod +w /mnt/c/Users/Public/Desktop
This will then allow you write permissions to the directory and allow you to create files.
NOTE - Please ensure that the initial bash executable is run as administrator at Windows level

How to give permissions for specific commands in linux

I am new to linux. I have a build.sh file which consists of a lot of mkdir commands and some rm commands. But as I have installed this new in my VB, each time I run the .sh file, it says "Permission Denied for creating directory" and fails.
So is there any way that I grant directory privileges to all users.
Can anyone help me with this
Add "sudo" in the beginning of the directory creation command i.e
sudo mkdir dir_name
The issue might be with the directory in which the mkdir command is being run.
Use the command ll or ls -l to check the directory permissions.
If your directory doesn't have write privilege for the current user, you can run
chmod -R u+w /path/to/directory
This might require you to use sudo if permission is denied.
If you want to enable it for all users, run
chmod -R ugo+w /path/to/directory
Alternatively, a quick fix would be to run the build.sh file as root
sudo /path/to/build.sh
However, this approach is not advised unless you always run it as root

sudo: unable to excute ./blah.sh: No such file or directory

I got this error
sudo: unable to excute ./blah.sh: No such file or directory
my code is every simple
#!/bin/bash
echo "blah"
And I'm sure that I've changed the permission to "rwx". When I try sudo bash blah.sh, I will get the output. But I still cant execute the file. And I'm in debian OS.
Anyone knows why?
make it executable
sudo chmod a+x ./blah.sh
that sets the executable bit for all users just
+x
for your single user
Check in /etc/sudoers if your username is allowed to sudo.

LINUX Permission issues

Can anyone help me in fixing the permission issues in Linux.
I am new to Linux and i am trying to run a script called buildAll.sh
by moving to that specific directory and i typed ./buildAll.sh the response i got was
./buildAll.sh: 16: ./buildAll.sh: ./buildJS.sh: Permission denied
i tried to run using sudo ./buildAll.sh , but that didn't work.
Then i tried with chmod -r 777 buildAll.sh and again i tried to run that script but no change.
I have a folder called build which has some dependency can be seen a folder with locked picture.
Can anyone help me to run the script without having the permission issues please
in line 16 your script seems to call buildJS.sh and the permissions OF THAT seem to be incorrect
You obviously have a pervasive permissions problem. Why don't you just start again, unpack the files into a new directory without using sudo or su, and then use chmod +x on the files that need to be executable?
sudo chmod +x buildAll.sh
Should do the trick
It seems by the error message the issue is with buildJS.sh. If buildJS.sh is not in your current directory (it might not be as buildAll.sh might be changing directories), find buildJS.sh and then:
chmod +x ${directory_where_found}/buildJS.sh
Since .sh files should have executable permissions by default you can do this:
cd $YOUR_DIRECTORY
find . -name '*.sh' -exec chmod +x {} \;
I tried with sudo chmod +x buildAll.sh
rm: cannot remove ‘build’: Permission denied
cp: cannot stat ‘./build/.svn’: Permission denied
cp: cannot stat ‘./build/compiler.jar’: Permission denied
cp: cannot stat ‘./build/buildJS.sh’: Permission denied
touch: setting times of ‘build’: Permission denied
./buildAll.sh: line 14: cd: build: Permission denied
./buildAll.sh: line 16: ./buildJS.sh: No such file or directory
You have given permission only to run your script. However, this doesn't mean that you have permission for all of instructions launched by the script. The error message is there to prove it ;) .

ant Permission Denied problem

After extracting and saving the ant files into an opt/ directory and setting the path variable
to $ANT_HOME/bin
I ran the following command on a CentOS 5
ant -version
and I am getting the following error
-bash:/path/opt/apache-ant-1.8.2/bin/ant: Permission denied
Is there some permission I am supposed to set or some typical source of this problem?
Thanks!
If you own the file, try
chmod u+x /path/opt/apache-ant-1.8.2/bin/ant
If someone else owns it, either sudo or become root then
chmod 755 /path/opt/apache-ant-1.8.2/bin/ant
You need to have execute permissions on the file; the first gives execute permissions to the owner only and is probably preferable if you own the file and are the only one that uses it. The second requires root privileges and gives execute and read permission to everyone, plus write permission to the owner.
You can view the current permissions and ownership of the file by running ls -l /path/opt/apache-ant-1.8.2/bin/ant.

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