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 fo…
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-top…
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, Followin…
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 Invali…
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 mu…
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…
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 …