The term 'shell' refers to a general class of text-based command interpreters most often associated with the Unix & Linux operating systems.
4
votes
1answer
24 views
mini-(Docker)-shell
I was given an assignment to write a mini-shell:
To write your own shell, you will need to start with a C program that
will prompt the user for input and accept in a number of arguments
from a ...
4
votes
2answers
51 views
Generate SQL UPDATE from Excel CSV file
I must write updates in a database from a flat file (CSV). I want to do that in the shell, with tools such as AWK.
...
2
votes
2answers
33 views
High CPU utilisation for Logs Manager shell script
I have written a shell script to manage the tcpdump pcap logs and syslog files in my Linux board, so as to maintain the disk usage to maximum of 70%.
The script checks for the disk usage every ...
2
votes
1answer
28 views
Fahrenheit / Celsius temperature converter - follow-up
This is an updated version of the script Fahrenheit / Celsius temperature converter. I have changed the script to be non-interactive, using positional parameters instead of asking for user input once ...
2
votes
0answers
43 views
Log all Google Chrome browser activity
This script documents every website visited and writes the text content of each webpage to its own individual file. It seems to work as intended. Is there anything I could do to improve it?
...
3
votes
1answer
49 views
Bash manual page selection menu
I wrote the following script in the hopes of streamlining the finding and reading of multiple manual pages. Since I am always looking up different utilities' manual pages I thought this would a good ...
1
vote
1answer
18 views
Pausing script while waiting for Docker container and printing updates
I'm looking to improve it in brevity, readability, and simplicity. Basically, I'm just looking for a more elegant solution. What improvements can I make?
...
1
vote
2answers
54 views
Iterating over a range of dates in a shell script
I have been working on a script that can be used to automatically pull the batch ids that were processed 4 days ago and which need to be processed tomorrow on the server. The batch IDs from 3 days ago ...
5
votes
1answer
49 views
`ls` indicates when directory is empty/full of dotfiles
I want ls to print a message when run on an empty or full of dotfiles directory. Instead of:
$ ls empty_dir/ dotfiles/
$
I ...
2
votes
1answer
32 views
Shell script to archive files to AWS S3
This is a simple script that moves files to S3 if they are > 14 days old. It ignores files that are < 14 days old. If the file is successfully synced to AWS S3 then we can remove it from the server....
2
votes
1answer
41 views
Shell script wrapper for Docker build and run
I have written a simple wrapper for docker build and docker run that allows me to build and run my image without having to use ...
2
votes
1answer
22 views
Shell command for the normal program termination of Skype from the command line
Would the following be the right way to do it in your opinion? Can you suggest a better alternative or, if not, is there something that can be done to make the existing version better?
...
4
votes
1answer
56 views
Raspberry Pi headless server using bash and USB automounting
Revised from: Bash scripts and udev rules to handle USB auto mounting / unmounting
Tested:
Uses USB insert/remove to control a headless Raspberry Pi 3 with Raspian Jessie Lite
Changes:
Implement ...
2
votes
0answers
46 views
Simple import system for a large shell program
I am writing a large shell program comprised of several source files. I was looking for a basic import system that accomplishes three goals.
Avoid sourcing entire files for access to just a few ...
3
votes
1answer
48 views
Shell script to display environment variables
This shell script writes my environment variables. If there is an argument, the shell script will grep for the argument in the environment variables.
...
1
vote
0answers
35 views
Tab completion for custom shell
The purpose of the code is to enable tab completion for a custom shell I'm writing. The target OSes are Linux and OpenBSD. I had to make a conditional include that I hope is correct:
...
4
votes
2answers
23 views
Isolate URLs from other text around it and put each on own line (with sed)
I have a small shell script that uses sed to take an input file of URLs with hand-written notes around them and strips the notes and puts each URL on its own line. ...
2
votes
1answer
50 views
Parsing and executing a simple shell script
I'm writing a simple shell and want to parse and execute a simple shell script.
...
2
votes
1answer
45 views
Sort and source configuration files from one of two directories
In a zsh I want to loop over all files in a configuration files' directory (/etc/myapp/) to source them. The files should be sourced in order and are named with two ...
-1
votes
1answer
40 views
More error-checking
The purpose of this code is to check for errors in my code for a custom shell.
In a previous answer, they say that my code didn't have error-checking.
You need to check the result of every ...
3
votes
1answer
63 views
Install Ruby using rbenv in a bash script
I want to write an automated bash script for installing Ruby and Rails using rbenv, but I am getting session reload issues in the terminal.
...
2
votes
1answer
96 views
POSIX arithmetic expansion
I understand that a shell should be able to perform arithmetic expansion. My shell can do it:
$ echo $((1+2*3+4*5))
27
My solution uses the lemon parser where I ...
3
votes
1answer
74 views
Running shell commands in a pipeline
I'm writing a shell in C for Linux and BSD. My code was unreadable before but I did a rewrite and now it is much more readable. The purpose of the code is to create a command pipeline and execute it.
...
-3
votes
1answer
50 views
Creating a struct
Mat told me to create a struct
create a struct for the individual commands and arguments. It should
have something like the "executable" name, number of args and arg
list. Create a few ...
2
votes
2answers
68 views
Shell command-line interpreter with pipeline parsing
Like many others I've been writing a shell command-line interpreter that can do a pretty decent pipeline parsing, first it splits the command at pipeline char (|), then it splits the substring at ...
3
votes
1answer
29 views
Displaying a table of shell aliases
I'm just getting into bash and sh scripting. I mostly just stub out little convenience or exercise scripts for myself, but I recognize I may be flaunting best practices at times.
My question is ...
2
votes
1answer
54 views
C main function for POSIX shell
I got a pretty large main function that I want to break up in smaller helper functions. Can you help me suggest what to break out into helper functions? The ...
0
votes
1answer
28 views
Handle builtin commands
I've written a small C function to handle the builtin commands of a custom shell that I'm writing in C. Is it better to use a switch instead?
...
0
votes
1answer
144 views
Tokenizing a shell command
I want to handle input like the following
ls -al | awk '{print $1}'
Now to parse it I couldn't tokenize at whitespace because of the quotations and I had to make ...
4
votes
1answer
40 views
Simple shell script to backup to Amazon over iSCSI
The script works but I know that it can be improved. Please note that my scripting skills are very basic :) (as it can be seen in my Frankenstein script – I took bits and pieces of the code from ...
3
votes
1answer
51 views
Display the last N lines of a text file with line numbers in reverse order
Do you think the way I'm doing it is fine? Is this the most typical way to do it? Share your thoughts please.
...
1
vote
1answer
31 views
POSIX shell script using a string to store command arguments
Background
I’ve started putting all my configuration files (which include many shell files) under version control. In the Git repository, I’ve configured a pre-commit hook that runs the ...
0
votes
0answers
51 views
Resolving the path to a Bash script
I wrote a function to resolve the full path to the current Bash script, and I'm wondering if it's SOLID:
...
4
votes
2answers
101 views
MS-DOS style OS
This is a very basic text-based operating system I've been working on. I started working with python a few weeks ago and this project only a few days ago, so there are probably better ways I can do ...
1
vote
1answer
58 views
Ruby backup/restore for provisioning
This is my second Ruby coding attempt. Also - this is my first OOP usage in Ruby.
I'm using if __FILE__ == $0 form here - same as it is in Python because it's ...
2
votes
1answer
28 views
Shell agnostic startup flow - env, profile, rc, login
The goal of these files is to have some common behavior between Bash and Zsh
when starting them. As is known, when Bash starts as a login shell it will
source the first found of the following in your ...
3
votes
2answers
57 views
Nagios plugin webdav check 2
Original post: nagios plugin webdav check
According to the good advice I have received I've made some modifications to the code:
...
4
votes
1answer
216 views
FFmpeg command line for showing two videos side by side
Here is command line for playing two videos side by side in sync in FFmpeg (ffplay). It can be useful for comaring videos, for example.
...
7
votes
0answers
145 views
Extracting single files from a tarball (spreadsheets)
I've created a program that will pull spreadsheets out of a large tarball.
First it specifies the file name through the "folio" number which is given as an argument when the program is called. From ...
3
votes
2answers
107 views
Basic shell implementation
Here is a small project to implement a basic shell. It is a personal ongoing project to keep system call usage fresh. It currently does background processes and some basic signal handling.
I am ...
5
votes
1answer
92 views
Constructing a simple shell from scratch
I'm actually doing my whole shell in C from scratch from a Linux computer.
The thing is that I think we all do our best from creating the simplest things that can be explained easily. And I'm not sure ...
5
votes
1answer
58 views
Function to get specified key from /proc/cpuinfo
On Linux, the file /proc/cpuinfo returns a set of key-value pairs, where the key and value are separated by a colon and each pair has its own line. It's a bit more ...
1
vote
1answer
31 views
Print values of an array while stripping out some parts of the string
Is there a more efficient way to run this? I am especially interested in a way which perhaps does not require a for loop...
...
7
votes
1answer
160 views
Detecting keyboard input
I want to use JavaFX as a solution to Java's issues with buffered input making things like 'press any key to continue' not easy.
I plan to use an event listener to detect keyboard input. But before I ...
11
votes
2answers
313 views
Editing Javascript and rendering HTML in one window v2
I wanted to revisit this site to post some recent work I put into this small project. I was able to add a console as suggested; but I thought I would ask here how my coding stying is before I work on ...
10
votes
3answers
456 views
Shell Script (Bash) to sum multiples of different arguments below a number
I'm interested in learning how to create shell scripts with bash so here's one of my first exercises, taken from here. It is an extension of the problems Elementary - 4 and 5.
The goal of the program ...
2
votes
1answer
45 views
Expanding tilde inside assignments and strings in bash
Inspired by the work Charles Duffy did in this answer and the work of Jonathan Leffler in this one and because I couldn't leave well-enough alone.
I went and wrote expandTilde.sh:
...
2
votes
1answer
62 views
Git post-receive hook writen as a POSIX shell script (utilising a named pipe)
This is my first piece of code to post here. I wrote this script as a
post-receive hook for a Git repository but I’m not so concerned with the Git
parts (I’d like to have the part marked with ...
-2
votes
1answer
59 views
Merging files in Bash
I had this homework assignment:
Create on the desktop a folder with your name.
Copy from your account [email protected] two files, ...
3
votes
2answers
128 views
Bash script to capture error message and change exit status
I'm working with the Perforce command line client. I ...
