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Tag: linux
Ansible win_updates won’t work on Debian 11 /(“msg”: “winrm put_file failed; nstdout: Active code page: 1252r)
I am fairly new to Ansible and have now started automating some repetitive Windows administration tasks. As a controller I use a Debian 11 VM where I have only Ansible and pywinrm installed. My test target is a Windows Server 2016 and everything works fine, I can install programs, create users or copy files. …
prompt and read a value as input for shell script
I am trying to create a shell script where it should prompt and read the values as input and then update the same shell script with that value in a specific line and column. Or if i can use another shell script to get the values and update original file. i wanted to read and update below parameters values as
When reading from /dev/tty, what is happening in input and keyboard buffer?
I am playing with the following two code snippets What the above code wants to do is to read a byte from the user keyboard and then print it to stdout. The confusing thing is two snippets have different behaviors: I am sorry about the format of the above code, I don’t know how to place the prompt at the
When I program in Linux using C, I use the open or creat functions and end up behaving differently
Line 43 is this part of main When I use creat, I get an error line:43 read: Bad file descriptor, but I get the correct result with open. Shouldn’t both functions return file descriptors? Why should creat return the wrong file descriptor When I use creat, I get an error line:43 read: Bad file descriptor,…
Zsh bad substitution error when installing Influxdb2.0
I am following the installation instructions from this article but I get a bad substitution error from zsh when executing this command: What am I supposed to change for zsh? Answer ${DISTRIB_ID,,} is a Bash-specific parameter expansion to lowercase the value of the variable. https://askubuntu.com/a/383360/250…
How does Linux Kernel know disk capacity? (at boot time)
I know that in linux environment, we can check the disk capacity (e.g. in units of the number of sectors) through commands such as df or fdisk. But, as far as I know, such a command seems to “read disk capacity information already loaded in memory”. (Not asking the disk directly for capacity) If s…
Find and replace words using sed command not working
I have a a text file which is tab separated, the first column holds the word to be found and the second column holds the word to replace the found word. This text file contains English and Arabic pairs. Once the word is found and replaced it should not be changed again. For example: So for a given text file:
Using Awk to print the unavailable record only once
I am writing an awk script which looks like this inside: This is my file. This tries to print the else if method once, but instead, it prints for all of the lines that do not include the searched value. If I entered 20, my output looks like this: I have to use the awk command to print else if
Calling “select” on fd 0 requires to fire
I’m trying to use “select()” to test if a key has been struck and then read it. It sort of works but only if {Enter} is pressed after the character. Sample code is as follows: If I press A nothing happens, but if I Press A{Enter}, the output is: The output is the same if I press ABC{Enter} W…