I’m working on my assignment and I’ve been stuck on this question, and I’ve tried looking for a solution online and my textbook. The question is: List all the lines in the f3.txt file that contain words with a character b not followed by a character e. I’m aware you can do grep -i R…
Tag: unix
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…
Swapping the first word with itself 3 times only if there are 4 words only using sed
Hi I’m trying to solve a problem only using sed commands and without using pipeline. But I am allowed to pass the result of a sed command to a file or te read from a file. EX: Anyway lets say I had a file F1 and its contents was : The output should be: Explanation: the program must only print
‘Housekeeping’ script to create folder and move files
I have been trying to investigate how to automate a script (shell or other) that periodically (once an hour for example) moves files with a constant naming convention to a folder (which is automatically created if not already there). The files are like this: Camera1_01_20171213221830928.jpg Camera1_01_2017121…
How can I pass in this echo statement into my function in bash?
So in my while loop I am trying to figure out how to pass in the echo statement into my function bitToSixtyFour as a parameter. It is saying that bitToSixtyFour is not found. Answer As defined the function takes argument $1 from command line : to read from standard input read it would be more efficient to use…
What really happens when deleting file [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. 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 …
Not able to change DOCTYPE line of a xml file in bash
I have a xml file with name alphabet.xml like below : – Now I want to replace <!DOCTYPE models SYSTEM “mp.dtd”> String of alphabet.xml with <!DOCTYPE models SYSTEM “/opt/nms_cif_mp/dat/mp.dtd”> code I am using is in below . But with this code replacement of the above …
How to store command arguments which contain double quotes in an array?
I have a Bash script which generates, stores and modifies values in an array. These values are later used as arguments for a command. For a MCVE I thought of an arbitrary command bash -c ‘echo 0=”$0″ ; echo 1=”$1″‘ which explains my problem. I will call my command with two …
egrep two identical numbers and two identical letters n times
Hi I’ve been having trouble with the command egrep. Here is my question: Lets just say I was running in a for loop on these words: I only want to print the word if it has two identical numbers and two identical letters and the word repeats itself. for example in this case the only words that should prin…
How do not write provided characters to bash stdout when program interrupted on getpass?
I have the simple code witch get password by getpass: Also I have a signal handler witch exit program. If signal was caught at the time of getting password from terminal, program stops, but all provided by user characters appears on bash prompt. Code of signal handler: How can I make bash prompt clear after i…