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Linux OS Dev
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Kernel programming for Linux operating systems can be done with many different languages; C, C++, Python, Perl and Java, which are some of the most common languages used.There are also many different varieties of Linux, such as Ubuntu, Fedora and OpenSUSE.
Share tech news, updates, or what's on your mind.
I have linux application account and would like to restrict the user to login directly. I want this account to be under sudoers. users can login and sudo into this account. How do i do that in linux?
5 Comments
Free Tool: SSL Checker
Imagine the following scenario:
A NAS box, providing a samba share, with several versions of a fíle collection in dated directories (name i.e. "2017.05.24").
On the NAS should be some links into subdirectories of the latest version, so the copy script should create symbolic links on the share to the latest version of that file collection.
When I try
A NAS box, providing a samba share, with several versions of a fíle collection in dated directories (name i.e. "2017.05.24").
On the NAS should be some links into subdirectories of the latest version, so the copy script should create symbolic links on the share to the latest version of that file collection.
When I try
ln -s <samba_share/link_name> <samba_share/dated_dir_subdir/>
Hi guys,
Although I find it hard to believe that what I'm looking for even exists, I'll still try my luck.
Is there any Linux Based IDE with native support for bash scripting?
(I don't only mean things like syntax highlighting but also auto completion and etc.) and preferably with git support.
Is there anyway to get a compiled bytecode from a bash script? I know about SHC but it doesn't really help becasue reversing it is way to easy - there's already a ready shell script to reverse the SHC compilation called UNSHC.
Although I find it hard to believe that what I'm looking for even exists, I'll still try my luck.
Is there any Linux Based IDE with native support for bash scripting?
(I don't only mean things like syntax highlighting but also auto completion and etc.) and preferably with git support.
Is there anyway to get a compiled bytecode from a bash script? I know about SHC but it doesn't really help becasue reversing it is way to easy - there's already a ready shell script to reverse the SHC compilation called UNSHC.
Hi,
what are the best practices and features, options while using grep.
i am using these days to search in log files, files, directories, content etc
When should i give single quote ' '
like
zgrep 'xyz' aaa.gz
When should i give double quote " "
like
zgrep "xyz" aaa.gz
how to use tail and head etc along with grep to effectively monitor last or first 100 lines etc
please advise
what are the best practices and features, options while using grep.
i am using these days to search in log files, files, directories, content etc
When should i give single quote ' '
like
zgrep 'xyz' aaa.gz
When should i give double quote " "
like
zgrep "xyz" aaa.gz
how to use tail and head etc along with grep to effectively monitor last or first 100 lines etc
please advise
Hi,
I keep getting below error when i wrote hello.sh shell script file and try to open it to.
Swap file ".hello.sh.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort:
why it created .swp file autoatically?
why it asks above question. How to tell unix not to ask that question.
please advise
I keep getting below error when i wrote hello.sh shell script file and try to open it to.
Swap file ".hello.sh.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort:
why it created .swp file autoatically?
why it asks above question. How to tell unix not to ask that question.
please advise
Hi,
what are differences between
user defined, environmental. local, global variables
when to use which one. what are advanatages, disadvantages of using each with practical examples.
please advise
what are differences between
user defined, environmental. local, global variables
when to use which one. what are advanatages, disadvantages of using each with practical examples.
please advise
Hi,
I like to write a unix shell script to check calendar year, date, current working directory.
how to write and shave .sh file(Say test.sh) and how to execute to see the output.
Any detailed link explaining these steps with screenshots. please advise
I like to write a unix shell script to check calendar year, date, current working directory.
how to write and shave .sh file(Say test.sh) and how to execute to see the output.
Any detailed link explaining these steps with screenshots. please advise
Hi,
I like to delete matched pattern in a file using vi editor and sed command
i tried as below not working
$ sed 'hello' aaaa.txt :% aaaa.sh
please advise
I like to delete matched pattern in a file using vi editor and sed command
i tried as below not working
$ sed 'hello' aaaa.txt :% aaaa.sh
please advise
I am trying to build nodejs from source code.
WARNING: C++ compiler too old, need g++ 4.8 or clang++ 3.4 (CXX=g++)
creating ./icu_config.gypi
* Using ICU in deps/icu-small
Using version-specific floating patch tools/icu/patches/58/sourc
creating ./icu_config.gypi
{ 'target_defaults': { 'cflags': [],
'default_configuration': 'Release',
'defines': [],
'include_dirs': [],
'libraries': []},
'variables': { 'asan': 0,
'coverage': 'false',
'debug_devtools': 'node',
'force_dynamic_crt': 0,
'gas_version': '2.20',
'host_arch': 'x64',
'icu_data_file': 'icudt58l.dat',
'icu_data_in': '../../deps/icu-small/sour
'icu_endianness': 'l',
'icu_gyp_path': 'tools/icu/icu-generic.gyp
'icu_locales': 'en,root',
'icu_path': 'deps/icu-small',
'icu_small': 'true',
'icu_ver_major': '58',
'node_byteorder': 'little',
'node_enable_d8': 'false',
'node_enable_v8_vtunejit':
'node_install_npm': 'true',
'node_module_version': 48,
'node_no_browser_globals':
'node_prefix': '/usr/local',
…
WARNING: C++ compiler too old, need g++ 4.8 or clang++ 3.4 (CXX=g++)
creating ./icu_config.gypi
* Using ICU in deps/icu-small
Using version-specific floating patch tools/icu/patches/58/sourc
creating ./icu_config.gypi
{ 'target_defaults': { 'cflags': [],
'default_configuration': 'Release',
'defines': [],
'include_dirs': [],
'libraries': []},
'variables': { 'asan': 0,
'coverage': 'false',
'debug_devtools': 'node',
'force_dynamic_crt': 0,
'gas_version': '2.20',
'host_arch': 'x64',
'icu_data_file': 'icudt58l.dat',
'icu_data_in': '../../deps/icu-small/sour
'icu_endianness': 'l',
'icu_gyp_path': 'tools/icu/icu-generic.gyp
'icu_locales': 'en,root',
'icu_path': 'deps/icu-small',
'icu_small': 'true',
'icu_ver_major': '58',
'node_byteorder': 'little',
'node_enable_d8': 'false',
'node_enable_v8_vtunejit':
'node_install_npm': 'true',
'node_module_version': 48,
'node_no_browser_globals':
'node_prefix': '/usr/local',
…
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I am running redhat linux 6.8
i want to build a new RPM using the source code of nodejs (6.10)
As i am new to RPB build, i am looking for assistance with creating RPM.
https://nodejs.org/en/download/
i want to build a new RPM using the source code of nodejs (6.10)
As i am new to RPB build, i am looking for assistance with creating RPM.
https://nodejs.org/en/download/
as per the output below i am getting some waiting for an event. every time it is stuck at poll As i have limited skills in strace, can some one guide me to find the root cause of the slowness.
munmap(0x7f14322fb000, 4096) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.x.x
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, ">a\1\0\0\1\0\0\0\0\0\0\tr
poll([{fd=5, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, "\242:\1\0\0\1\0\0\0\0\0\0
poll([{fd=5, events=POLLIN}], 1, 4999
[root@ tmp]# strace -e poll yum repolist
Loaded plugins: product-id, search-disabled-repos, security, subscription-manager
poll([{fd=5, events=POLLIN}], 1, 10) = 1 ([{fd=5, revents=POLLIN}])
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
poll([{fd=5, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=5, revents=POLLOUT}])
poll([{fd=5, events=POLLIN}], 1, 4999) = 0 (Timeout)
poll([{fd=6, events=POLLOUT}], 1, 0) = 1 ([{fd=6, revents=POLLOUT}])
poll([{fd=6, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=6, revents=POLLOUT}])
poll([{fd=6, events=POLLIN}], 1, 4999) = 1 ([{fd=6, revents=POLLIN}])
poll([{fd=6, events=POLLIN}], 1, 4999) = 1 ([{fd=6, revents=POLLIN}])
poll([{fd=6, …
munmap(0x7f14322fb000, 4096) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.x.x
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, ">a\1\0\0\1\0\0\0\0\0\0\tr
poll([{fd=5, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, "\242:\1\0\0\1\0\0\0\0\0\0
poll([{fd=5, events=POLLIN}], 1, 4999
[root@ tmp]# strace -e poll yum repolist
Loaded plugins: product-id, search-disabled-repos, security, subscription-manager
poll([{fd=5, events=POLLIN}], 1, 10) = 1 ([{fd=5, revents=POLLIN}])
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
poll([{fd=5, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=5, revents=POLLOUT}])
poll([{fd=5, events=POLLIN}], 1, 4999) = 0 (Timeout)
poll([{fd=6, events=POLLOUT}], 1, 0) = 1 ([{fd=6, revents=POLLOUT}])
poll([{fd=6, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=6, revents=POLLOUT}])
poll([{fd=6, events=POLLIN}], 1, 4999) = 1 ([{fd=6, revents=POLLIN}])
poll([{fd=6, events=POLLIN}], 1, 4999) = 1 ([{fd=6, revents=POLLIN}])
poll([{fd=6, …
My VMware machine is not booting.
"vsd-mount [!!]
you have entered the recovery shell. the situation you are in may be recoverable.
if you are able to fix this situation the boot process will continue normally after you exit this terminal
/bin/sh: can't access tty; job control turned off"
"vsd-mount [!!]
you have entered the recovery shell. the situation you are in may be recoverable.
if you are able to fix this situation the boot process will continue normally after you exit this terminal
/bin/sh: can't access tty; job control turned off"
Hi Experts
I have a customer that has Linux Centos 6.5 samba file server installed. (old server)
They also have another server that has Centos 7 samba file server installed. (new server)
My scope on the project is to migrate from old server to new server.
I'm not very good in Linux but I understand that it requires to create Linux users as well as samba user for file sharing permission.
What is the proper way to migrate shared folder to new server including [file and folder permissions] and [list of users(linux and samba)"]?
Example we can use Robocopy in Windows server to migrate permission, how about in Linux ? Could you please provide step by step ?
Thanks
I have a customer that has Linux Centos 6.5 samba file server installed. (old server)
They also have another server that has Centos 7 samba file server installed. (new server)
My scope on the project is to migrate from old server to new server.
I'm not very good in Linux but I understand that it requires to create Linux users as well as samba user for file sharing permission.
What is the proper way to migrate shared folder to new server including [file and folder permissions] and [list of users(linux and samba)"]?
Example we can use Robocopy in Windows server to migrate permission, how about in Linux ? Could you please provide step by step ?
Thanks
Dear All,
We have created a chrooted jail environment for our SFTP access. Using chrooted environment, we restrict users either to their home directory or to a specific directory. Now my question is if there's anyway we can an additional username to access the same home directory for other username? Or any other words, is there anyway I can assign different usernames to the same home-directory and have it chrooted jail?
Below is our current config if that helps:
group add sftponly
vi /etc/ssh/sshd_config
#Subsystem sftp /usr/libexec/openssh/sftp-
Subsystem sftp internal-sftp
Match Group sftponly
ChrootDirectory %h
ForceCommand internal-sftp
X11Forwarding no
AllowTcpForwarding no
systemctl restart sshd.service
useradd USERNAME –g sftponly –s /bin/false
passwd USERNAME
mkdir /home/USERNAME/SFTPWRITE
chown root /home/USERNAME
chmod 755 /home/USERNAME
chown USERNAME /home/USERNAME/SFTPWRITE
chmod 755 /home/USERNAME/SFTPWRITE
setsebool –P ssh_chroot_rw_homedirs on
We have created a chrooted jail environment for our SFTP access. Using chrooted environment, we restrict users either to their home directory or to a specific directory. Now my question is if there's anyway we can an additional username to access the same home directory for other username? Or any other words, is there anyway I can assign different usernames to the same home-directory and have it chrooted jail?
Below is our current config if that helps:
group add sftponly
vi /etc/ssh/sshd_config
#Subsystem sftp /usr/libexec/openssh/sftp-
Subsystem sftp internal-sftp
Match Group sftponly
ChrootDirectory %h
ForceCommand internal-sftp
X11Forwarding no
AllowTcpForwarding no
systemctl restart sshd.service
useradd USERNAME –g sftponly –s /bin/false
passwd USERNAME
mkdir /home/USERNAME/SFTPWRITE
chown root /home/USERNAME
chmod 755 /home/USERNAME
chown USERNAME /home/USERNAME/SFTPWRITE
chmod 755 /home/USERNAME/SFTPWRITE
setsebool –P ssh_chroot_rw_homedirs on
Hello Folks,
I have a script *.sh That I like to install to few machines (IPs Address), is there anyway anybody can help me write script to do multiples at the same time ?
By the way I'm currently using centos x64
I'd appreciate it and thanks for looking
I have a script *.sh That I like to install to few machines (IPs Address), is there anyway anybody can help me write script to do multiples at the same time ?
By the way I'm currently using centos x64
I'd appreciate it and thanks for looking
Hello
How to turn on computer automatically from crontab in Cantos & Ubuntu ?
How to turn on computer automatically from crontab in Cantos & Ubuntu ?
Have a telecommunication server that switched over to its backup. After the switchover we noticed a couple of files that can't be deleted.
[root@LABSYS2 log]# ls -ltr
ls: cannot access 1000025.DBG: Input/output error
ls: cannot access 10002CB.AUD: Input/output error
total 769808
-????????? ? ? ? ? ? 10002CB.AUD
-????????? ? ? ? ? ? 1000025.DBG
I tried to find the inode of the file and use it to delete but "ls -il" did not return inodes (it only did for other files in dir)
ls -li
find ./ -inum <inode number> -exec rm -i {} \;
Please offer any suggestions.
Thanks!
[root@LABSYS2 log]# ls -ltr
ls: cannot access 1000025.DBG: Input/output error
ls: cannot access 10002CB.AUD: Input/output error
total 769808
-????????? ? ? ? ? ? 10002CB.AUD
-????????? ? ? ? ? ? 1000025.DBG
I tried to find the inode of the file and use it to delete but "ls -il" did not return inodes (it only did for other files in dir)
ls -li
find ./ -inum <inode number> -exec rm -i {} \;
Please offer any suggestions.
Thanks!
i have some old unix disks that are on 3.5 and i need to access the data on them, i have loaded up linux and hae been trying to load them but to no success have tried
$ mkdir /mnt/floppy
working through this page
https://www.bleepingcomputer.com/tutorials/introduction-to-mounting-filesystems-in-linux/
$ mkdir /mnt/floppy
working through this page
https://www.bleepingcomputer.com/tutorials/introduction-to-mounting-filesystems-in-linux/
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I have the following output i want to write a python code to read only $### and store in a list.
3/14/17
DiningGINO'S PIZZA
Dining ...2121$15.81
Open Drawer3/14/17
DiningBoosty
Dining ...2121$5.65
Open Drawer3/14/17
Tim Hortons Tim Hortons
Dining ...2121$5.60
Open Drawer3/11/17
DiningENCcont
Dining ...2121$8.76
Open Drawer3/11/17
...
output omitted.
3/14/17
DiningGINO'S PIZZA
Dining ...2121$15.81
Open Drawer3/14/17
DiningBoosty
Dining ...2121$5.65
Open Drawer3/14/17
Tim Hortons Tim Hortons
Dining ...2121$5.60
Open Drawer3/11/17
DiningENCcont
Dining ...2121$8.76
Open Drawer3/11/17
...
output omitted.
Hi Guys,
Machines on my network recently updated to version 52, which has caused a lot of problems, i managed to get a copy of the 51 deb, but there are one or two machines, when after running "purge firefox" and trying to install version 51 from running dpkg -i firefox.deb it just wont install, if i do apt-get install firefox it works, but only version 52.
I am connecting to these machines over netcat
Machines on my network recently updated to version 52, which has caused a lot of problems, i managed to get a copy of the 51 deb, but there are one or two machines, when after running "purge firefox" and trying to install version 51 from running dpkg -i firefox.deb it just wont install, if i do apt-get install firefox it works, but only version 52.
I am connecting to these machines over netcat
Dear Experts
I have installed rhel7 and httpd24, rh-php56 and mysql56 this is required for sugarcrm7.8 with the default repos and as well additional with the repo rhscl I am not getting the php56-php-mcrypt , without this it is not becoming possible to install the Sugarcrm7.8, can you please suggest where I can get the package php56-php-mcrypt. thanks in advance
I have installed rhel7 and httpd24, rh-php56 and mysql56 this is required for sugarcrm7.8 with the default repos and as well additional with the repo rhscl I am not getting the php56-php-mcrypt , without this it is not becoming possible to install the Sugarcrm7.8, can you please suggest where I can get the package php56-php-mcrypt. thanks in advance
I am logged into Linux box and I am not good in commands
I am attaching screen shot, I need to select continent, time zone
I don't know what next steps to take,
can some body guide me in taking what key board steps
C--Users-ic1pxk-Desktop-Capture.JPG
I am attaching screen shot, I need to select continent, time zone
I don't know what next steps to take,
can some body guide me in taking what key board steps
C--Users-ic1pxk-Desktop-Capture.JPG
My computer is running Windows 10 Pro, 64-bit. My C language files or my code (program) are stored in the hard disk.
The old and new version of WindRiver Diab Compiler are stored in Linux Server?
My bash profile used to contain path to old compiler. To compile, I ran Winscp to access Linux Server. Then, I dragged my C language project to Linux Server. I opened the command window from Winscp and invoked make program to build my executables. This all worked fine.
To build with new compiler, I changed path in my bash profile but my code (program) is still getting build with old compiler. The generated .map file shows path to old compiler.
My bash profile is stored in my windows desktop. Does Winscp read bash profile when it is invoked? How does it know to read bash profile from desktop? Why is my program not getting built with new compiler?
The old and new version of WindRiver Diab Compiler are stored in Linux Server?
My bash profile used to contain path to old compiler. To compile, I ran Winscp to access Linux Server. Then, I dragged my C language project to Linux Server. I opened the command window from Winscp and invoked make program to build my executables. This all worked fine.
To build with new compiler, I changed path in my bash profile but my code (program) is still getting build with old compiler. The generated .map file shows path to old compiler.
My bash profile is stored in my windows desktop. Does Winscp read bash profile when it is invoked? How does it know to read bash profile from desktop? Why is my program not getting built with new compiler?
in bash file i have a if statement
if [err -gt 0] then # if err greather that 0
stat=error
elsif [war -gt 0] then
stat=warning
elseif [rng -gt 0] then
stat=wrong
else stat=OK
fi
syntax error near unexpected token `else'
'else stat=OK'
what is wrong her
if [err -gt 0] then # if err greather that 0
stat=error
elsif [war -gt 0] then
stat=warning
elseif [rng -gt 0] then
stat=wrong
else stat=OK
fi
syntax error near unexpected token `else'
'else stat=OK'
what is wrong her
Linux OS Dev
8K
Solutions
3
Articles & Videos
7K
Contributors
Kernel programming for Linux operating systems can be done with many different languages; C, C++, Python, Perl and Java, which are some of the most common languages used.There are also many different varieties of Linux, such as Ubuntu, Fedora and OpenSUSE.
Top Experts In
Linux OS Dev
