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Redirect the standard output [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 5 years ago. Improve this ques…

Linux userspace header failing to compile with g++

I have a cpp source file in which I have included the following Linux uapi header: #include <linux/netfilter_ipv4/ip_tables.h> I’m using RH6, but the header seems to be identical to the one found in the Linux kernel mainline: http://lxr.free-electrons.com/source/include/uapi/linux/netfilter_ipv4/i…

Compute base64 encoded hash from a given hash?

I created a file and input some random string into it. Now if I use openssl to compute base64 hash [sha256], I run this: which returns me KHN0ZGluKT0gMzJjYjA1MTgzNDNhZmY2N2FlMmY5YzUwNDcwNGRiNGE5Njc5MzIyZWVlNTBmMjBiNTMzNjZlYTBiMDY2MWNlZgo= Now I process this hash stepwise, as, which gives me (stdin)= 32cb05183…

Permission denied. Laravel linux server

when i try to register and send an email to the user i got this error. It was working till yesterday. From today it gives me this and i cant figure out why. By the way on local testing this work’s. I’m stuck. Help please Answer I cannot comment because I have joined stackoverflow recently and I do…

how to make the progame start only one process?

I have a python project using python stand lib socketserver to listening on a tcp socket for data receiving. I create a one-single executable file using pyinstaller, now I run the binary program on linux, there are two process. After exit the current session and re-login, there are still two process. How can …

Expanding when one has command substitution

I have to echo an output of a command substitution concatenated with string. The string to be prepended is in fact the string of pathname. The need for use of absolute path together with filename arises due to filename containing special character,-, at the beginning of it. I’ve come up with a draft tha…

Python’s daemon PPID not equal to 1

Creating daemons in Linux is quite complex issue, but it’s very well documented in daemon(7) manual. Thankfully there is python-daemon module for Python 2 and 3 that implement PEP3143, so I’m using it. Here comes the question: when I was playing with python-daemon module I was surprised that daemo…

Handling of blocked named semaphores after a system reboot

Within a Linux Box I’m using named semaphores to control access to system resources used by different processes. If the system accidentally crashes, it can happen, that a semaphore has been acquired but not given back yet. Given that situation, I noticed, that even after a reboot the semaphore remains s…