I got a task to display all bash fonts/colors/background colors in table where the text is different for each variation and is being taken from file that contains 448 words/random number(I’m working with numbers). Here is my code for displaying all variations Output: enter image description here Code for generating random numbers: So the question is how can I pass
Tag: file
How to open files sequentially on a terminal?
I want to iterate through all files in a directory and open them with an editor, but I don’t want to open the next one until the previous has closed. something like: Answer You don’t have to do anything; the shell blocks until vim exits each time through.
Clone a folder / raid on a folder?
I have two hard drive of 4Tb connected to my raspberry pi. Let’s call them A and B. I have some folders on A that have to be copied on B. At all the time, something like a RAID10 on some folder. So, if I copy test.jpg in disk A, test.jpg has to be copied on disk B. If I
What is the 4-digit octal Unix file permission system? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Closed 4 years ago. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack Exchange site, you can leave a comment to
How to find a string in a file and write a new string immediate next line of that search string in a file using C
I need a suggestion to find and write strings in a file using c program. For example, File.txt has following contents Here, I want to search a string “ddddd” and write new string (“MMMM NNNN”) after this line like File will have following contents after addition of new string, Following is the example Code that I’m trying to make it
How to read a [nonblocking] filedescriptor of a file that is appended to (aka, like tail -f)?
Actually, I am using libev; but under the hood this is using epoll (I’m only on linux). When I add a watcher to read a file and all data has been read then I do get a call back that there is data to read, but read(2) returns 0 (EOF). At that point I have to stop the watcher or
fopen() returns inavlid argument when writing on SD card?
I’m trying to write a file on SD card if it’s inserted into the kit. Otherwise, the file should be written to the current directory of the project. I can write the file in the project’s directory without any problems. However, when I try to write it on the inserted SD card, it returns Invalide argument! I tried changing the
How to create a system-wide file lock?
I am trying to have a number of independent processes coordinate their writing to file using a system-wide lock (see here: Concurrent file accesses from different scripts python) The lock needs to span the whole system, because the processes are spawn independently and at different times. Here: System-wide mutex in Python on Linux I read that fcntl.lockf should do what
Equivalent to named pipes in Unix for LIFO/Stack structure
I have been looking at all the different types of Unix file: regular files, directories, device files, symbolic link, doors, socket, named pipes,… but I couldn’t find a file type that would behave like a stack/LIFO structure. As most of you know, the advantage of FIFO/named pipe over regular files is the following: from https://askubuntu.com/questions/449132/why-use-a-named-pipe-instead-of-a-file Almost everything in Linux can
Extract Column(s) from text file having Multi Character Delimiter i.e. “%$%”
I have tried different solution for the problem given on the forum but doesn’t work for the specified Delimiter %$%, I need to extract one specific column from the file containing 200+ columns. I tried the following: Answer The symbol $ is a special character in a regex, so you need to escape it with a , which is also