The term 'shell' refers to a general class of text-based command interpreters most often associated with the Unix & Linux operating systems.
-1
votes
0answers
22 views
Evaluating an if statement
My use case is to evaluate an if statement the way a command-line shell does it for example
if [ 1==1 ];then echo FOO; fi
When I run the if statement the ...
3
votes
0answers
14 views
Install ruby using rbenv in bash script
I want to write an automated bash script for installing ruby and rails using rbenv. But I am getting issue of session reload in terminal.
My bash script:-
...
3
votes
1answer
71 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
59 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
41 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
49 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
26 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
49 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
27 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
71 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
34 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
44 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
24 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
50 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
75 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
51 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
19 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
46 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
122 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.
...
6
votes
0answers
134 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
86 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
79 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
47 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
104 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
252 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
428 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
44 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
43 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
56 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
110 views
Bash script to capture error message and change exit status
I'm working with the Perforce command line client. I ...
0
votes
1answer
50 views
Print a “shebang” line, or prepend it to a file
This is a sort-of-useless "utility" I wrote to learn my way around shell programming better.
My concerns are:
Is the code readable? Could it be more efficient, or just simpler? The logic ends up ...
2
votes
2answers
35 views
Split redirecting to multiple files in bash
A function mycommand which runs command and:
Gives me three log-files which are:
*.stdout.log: everything from ...
10
votes
1answer
77 views
POSIX shell compatible and POSIX conforming dirname implementation
The discussion in the comments of this answer made me wonder how hard it would be to write a built-in only version of dirname.
This is what I ended up with but I'm ...
4
votes
3answers
89 views
Shell script to detect router slider status
I have an openwrt router (TP-Link MR3040) and on boot I have it check the slider (AP, WISP, 3G/4G mode). The goal was to have it execute the current "slider status" vs the old one, or do nothing if ...
5
votes
1answer
27 views
Shell Script Audio Logger
I created my first shell script. It's an audio logger that runs on the hour for an hour and restarts. Although if it is started within the hour it will only run until the end of the hour.
I've added ...
4
votes
1answer
52 views
Optimising script that does simple renaming of files
I have recently written some code in Bash where I'm starting to program some things and I think I'm overcomplicating the script I wrote.
I'd like to make it simpler so that in future I would avoid ...
3
votes
2answers
158 views
A basic C Shell for Linux
I have written a basic C Shell. It features the builtins cd, programmer, ver and ...
8
votes
2answers
129 views
Backup Linux system to web
First I create a .tar of the root directory with all the file permissions saved and excluding all irrelevant directories (are these the right folders to be ...
3
votes
1answer
35 views
Removing ASCII “frame” around text
I sometimes save nice fortune outputs to my Evernote. The data looks like this:
...
3
votes
1answer
51 views
Shell binary search with sorted input
I have coded binary search in shell, just for practice.
Input
Input data is already sorted set of numbers streamed to the script. $1 is the sought number.
...
3
votes
1answer
54 views
Remove line numbers from shell history
I want to parse Linux history output and the commands parts only (without numbers):
...
6
votes
2answers
324 views
Address book app to learn bash
I'm fairly proficient in C and Python, but want to learn some skills for administrating my new Linux machine. I wrote this simple address book app to teach myself shell scripting. This is the first ...
4
votes
3answers
178 views
Validating a credit card number using Luhn's algorithm
I implemented Luhn's algorithm explained on Wikipedia to validate a credit card number, in Bash.
Does this code follow good practices?
...
1
vote
1answer
43 views
Unix shell script with master and source files
I have a script which is having too many modules. The script is working perfectly, but the only issue is it is taking too much time and I need to reduce the complexity of the script.
I have a source ...
4
votes
3answers
69 views
Checking dates against a .properties file
I am writing a script that will check the set values against a .properties file and I am just wondering if there is any nicer way to write what I have here.
...
2
votes
0answers
69 views
Parallelized image transformations using GraphicsMagick
This is part of a script that I use for porting a TWRP Theme from one resolution to another. Respectively portrait to portrait and landscape to landscape. In this function entirely, it focuses on the ...
4
votes
1answer
340 views
Shell script that copies configuration and dotfiles to repository
A while ago I had the idea to store all the important configuration and dotfiles from my system in a Git repository. That saved me a few months ago: My harddrive died, but I could get back to work ...
8
votes
2answers
156 views
Recovery Shell (rsh)
I wrote a shell to test my understanding of processes etc. It is not supposed to comply with POSIX or anything, just to allow people to run simple commands with simple arguments.
...
4
votes
3answers
177 views
Bash script that checks if font is installed and installs it if necessary
This checks if a font is installed by using fc-list and grep. If the particular font is not installed, it offers to install it ...
