I run a script that gets the cygdrive prefix by running mount -p. Usually this returns:
$mount -p
Prefix Type Flags
/cygdrive system binmode
Now the command returns the heading, but no cygdrive prefix, which looks like this:
$mount -p
Prefix Type Flags
The system is currently running without exhibiting any other problems, but my script is failing to determine the prefix. Where is this information stored, /etc/something?
I dug through bash_history and found that someone (its is a shared system) ran "umount -c", which removes the cygdrive prefix. The solution was to run "mount -c /cygdrive". This added /cygdrive back when running "mount -p".
Related
this happens when I have
an executable that is in the /tmp directory (say /tmp/a.out)
it is run by a root shell
linux
selinux on (default for RedHat, CentOS, etc)
Apparently trying to run an executable that sits in the /tmp/directory as root revokes the privileges. Any idea how to go around this issue, other than turning off selinux? Thanks
You can set file context on binary or directory (containing binary) that are in /tmp that you want to run.
sudo semanage fcontext -a -t bin_t /tmp/location
Then restorecon:
sudo restorecon -vR /tmp/location
Just have a look at the mount options for /tmp directory, most probably you have no-exec option on it (there are many security reasons of doing that, the first being that anyone can put a file in the /tmp directory)
My app uses log4j and writes the logs to directory A which is in root directory. I want to move the logs out to a mounted drive without making any change in the application.
Can I use soft symlink to do this? I have created a symlink like this -
ln -s A mounted_drive_directory
But I still see logs written to directory A.
ln [OPTION]... [-T] TARGET LINK_NAME, so your arguments order is wrong. You'll have to delete (or move) A first before creating the link, or filename conflict will occur.
You could also use mountpoint bindings for that, e.g. mount --rbind /mounted/drive/directory /full/path/to/A, but it have to be done on each system boot (or saved in /etc/fstab to be auto-executed on boot).
ln works a little bit different:
first argument is real folder\file, second - symlink.
mv /root/A /root/B;
ln -s mounted_drive_directory /root/A;
i am trying to get folder lists from remote server, and it is not possible to mount remote server into my local computer (because of the permission issue).
i used
smbclient "//165.186.89.21/DeptDQ_141Q_FOTA" "--user=myid" -c 'ls;'
to get lists of the folder.
and the result was success.
but, actually i want to use ls -l with the above the command line
and when i try to get results using the line
smbclient "//165.186.89.21/DeptDQ_141Q_FOTA" "--user=LGE\final.lee" -c 'ls -l;'
it returns
NT_STATUS_NO_SUCH_FILE listing \-l
64000 blocks of size 16777216. 6503 blocks available
...
how should i use smbclient operator with ls -l option?
please help me!
smbclient ls does not run a native ls command, but rather invokes built-in functionality. As such, it does not support the usual options which a native, POSIX-compliant ls command would provide.
Thus, you cannot do this.
If your goal is to read metadata, consider trying the smbclient stat [filename] subcommand instead (if your server supports UNIX extensions), or smbclient allinfo [filename] (otherwise).
I am currently having trouble running linux perf, mostly because /proc/sys/kernel/kptr_restrict is currently set to 1.
However, if I try to /proc/sys/kernel/kptr_restrict by echoing 0 to it as follows...
echo 0 > /proc/sys/kernel/kptr_restrict
I get a permission denied error. I don't think I can change permissions on it either.
Is there a way to set this directly somehow? I am super user. I don't think perf will function acceptably without this being set.
In your example, echo is running as root, but your shell is running as you.
So please try this command:
sudo sh -c " echo 0 > /proc/sys/kernel/kptr_restrict"
All the files located in /proc/sys can only be modified by root (actually 99.9% files, check with ls -l). Therefore you have to use sudo to modify those files (or your preferred way to execute commands as root).
The proper way to modify the files in /proc/sys is to use the sysctl tool. Note that yu should replace the slashes (/) with dots (.) and omit the /proc/sys/ prefix... read the fine manual.
Read the current value:
$ sysctl kernel.kptr_restrict
kernel.kptr_restrict = 1
Modify the value:
$ sudo sysctl -w kernel.kptr_restrict=0
sysctl kernel.kptr_restrict=1
To make your modifications reboot persistent, you should edit /etc/sysctl.conf or create a file in /etc/sysctl.d/50-mytest.conf (edit the file as root or using sudoedit), containing:
kernel.kptr_restrict=1
In which case you should execute this command to reload your configuration:
$ sysctl -p /etc/sysctl.conf
P.S. it is possible to directly write in the virtual file. https://stackoverflow.com/users/321730/cdyson37 command is quite elegant: echo 0 | sudo tee /proc/sys/kernel/kptr_restrict
I am developing an application in beaglebone.
I want to add start up scripts to my Beaglebone but I can not find /etc/inittab.
I am using the image : Angstrom-Cloud9-IDE-GNOME-eglibc-ipk-v2012.05-beaglebone-2012.06.18.img.xz
I think in the previous versions of image there is /etc/initab but for the new distributions I could not find the inittab :/
I want to apply this : Automatic login on Angstrom Linux
but I can not because there is no /etc/inittab.
Where is the inittab in new distributions.
When I write uname -r it gives:
3.2.23
Regards
inittab has been replaced by systemd
This is how I did it for the serial console. You can probably adapt it easily for tty1 by replacing "serial-getty#..." by "getty#...", but I haven't tested it.
cp /lib/systemd/system/serial-getty#.service /etc/systemd/system/autologin#.service
rm /etc/systemd/system/getty.target.wants/serial-getty#ttyO0.service
ln -s /etc/systemd/system/autologin#.service /etc/systemd/system/getty.target.wants/serial-getty#ttyO0.service
Create the following script file in any location (/home/root/autologin.sh in my case)
#!/bin/sh
exec /bin/login -f root
Make it executable
chmod a+x autologin.sh
Edit /etc/systemd/system/autologin#.service and update the ExecStart command by adding the -n (Do not prompt the user for a login name) and -l (Invoke the specified login_program instead of /bin/login) options.
ExecStart=-/sbin/agetty -n -l /home/root/autologin.sh -s %I 115200