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Questions tagged [bash]

Bash is the shell from the GNU project. It is the standard shell on many Linux distributions and often available on other *NIXes.

-1
votes
1answer
82 views

Shell Script does not capture values inside ENDSSH

I am very new to writing Shell scripts and am trying to write a simple script to run Vagrant up then SSH into the box and run some commands. The echo Hi there will run but the read -p will never show. ...
0
votes
1answer
179 views

If statement best practice [duplicate]

I am reviewing best practice with if statements. Below in example A I include the entire code to be run and ensure it remains within the if statement. While for example B the code to be executed ...
2
votes
1answer
47 views

How can I maintain bash functions without brittle escaped newlines?

I have functions like this: foo() { /some/script \ --opt1=val1 \ --opt2=val2 \ --opt3=val3 } This is brittle if I take out the last option, or add any new option at any line. ...
2
votes
3answers
712 views

Is it pythonic to replace a bash script with series of subprocess calls

I have a pretty simple bash script which consists of a bunch of one liners and some simple logic. Its been recommended that I rip the bash script apart and rewrite it all in python using subprocess. ...
6
votes
2answers
295 views

Anything wrong with having aliases on a production server?

On my local server, I create aliases like these to speed up my work: alias bashrc='vi ~/.bashrc;source ~/.bashrc;echo bashrc has been sourced' alias bashprofile='vi ~/.bash_profile;source ~/....
7
votes
4answers
1k views

How should I version control my bash profile?

So I'm very comfortable with version control, and just thought to start tracking versions of my bash profile: ~/.bash_profile with the added benefit of being able to share my various aliases and such ...
17
votes
2answers
12k views

Share private SSH keys with Bash on Windows

I have Windows 10 with Git installed. This Git uses my C:/Users/MyName dir as the HOME directory and the /.ssh/ dir within, appropriately for sourcing my private SSH keys. I have just enabled and ...
0
votes
1answer
246 views

Pcregrep vs Perl vs Python for bash scripting when needing advanced regex features [closed]

I've lately been using pcregrep to do Perl-style group matching when doing my bash scripts. The problem with pcregrep is that it's not readily available on Linux machines in general. An alternative ...
0
votes
2answers
604 views

git clone vs cp -R

I want to use an existing project as a starting point for a new project by copying or cloning it. There are at least two ways of doing this. Method 1: Copy it. cp -R /path/to/source /path/to/dest ...
2
votes
0answers
108 views

Implementing redundant GIT backup scheme

I want to push a local repo to multiple remote GIT repositories to achieve redundancy in my backup scheme. So, let's say I plan to use Github and BitBucket to host my repositories. I have two ...
2
votes
2answers
84 views

Ideas on processing input text file in parallel by Bash script

I have a Bash script that processes files read from standard input, one pathname per line, and runs a CPU intensive task on each file. I happened to notice that even with four cores (grep -c ^...
-1
votes
2answers
233 views

Extensible way to create bash program

I have a bash script that should be extensible with additional functions with as little change to the script as possible. The basic function is as follows. It loops through a list of files to check. ...
5
votes
4answers
855 views

Shell commands in bash or python? How much encapsulation is too much?

I'm thinking about how to decide whether it's better to encapsulate my work behind well-named function names, or to expose it - which will help developers understand what's going on more quickly? Is ...
2
votes
1answer
804 views

Why should I use a Dockerfile instead of a batch script?

I'm new to Docker and feeling my way around. My plan is to build a typical web app using Nginx+Rails+Postgress, all of which will be in the one container. I'm not (currently) doing anything complex ...
0
votes
0answers
941 views

Best practices to prevent DoS attack, PHP running bash script on apache server

I have a PHP page the sole purpose of which is to spawn a bash script to run some background code (10-15 seconds run time), and then forward to a second page. The second page waits for the background ...
0
votes
1answer
125 views

Unix way of filtering/mapping/mapcatting records via the pipeline?

At home I use Linux and have for more than a decade. At work we use Windows and so I find PowerShell more familiar. I am a Linux/Unix fanboy at heart, but I've had greater success grokking the ...
2
votes
1answer
137 views

One Script file or Multiple Script Files [closed]

I have a moderately long(for me at least) bash script file that that maintains a list of LAN users and the bandwidth each one uses. It is 199 lines with 11 functions and is already calling 3 different ...
0
votes
1answer
263 views

Need advise for porting linux script to Win command line [closed]

I am creating app(script) that is used similar to RSS reader for specific webpage that doesn't have RSS. So my app downloads that html page in defined intervals, checks new items and parses them into ...
14
votes
3answers
584 views

When is it appropriate to use colour in a command-line application?

Currently I have a command-line application in C called btcwatch. It has a -C option that it can receive as an argument that compares the current price of Bitcoin with a price that was stored ...
2
votes
3answers
2k views

Recommended guidelines for declaring bash/sh variables

I have been programming in BASH for a while now and the scripts that I write are starting to get more complicated. I realized that I started to bring in some habits from C/C++ and wanted to get ...
1
vote
1answer
5k views

Encoding a bash script for use in Python

I am writing some code in Python which checks for the validity of a license key after polling a server. If it is valid then the Python program in turn runs some bash scripts. How to create a ...
5
votes
2answers
920 views

Is bash “finished”? [closed]

Should bash be expected to change in ways that break non-trivial amounts of existing scripts at some point in the (near/<5y) future? How much change has it gone trough in the last ten years ...
1
vote
2answers
329 views

Need some advice and feedback on my code's design

I am looking for feedback on the design of my program. I have a shell script call function.sh that defines a lot of helper functions. My intent is to use those bash functions defined in functions.sh ...
7
votes
1answer
6k views

Is it possible to use python as a shell replacement? [duplicate]

Recently I was looking at python's shutil and subprocess etc... And I started wondering: wouldn't it be ok to use python instead of e.g. bash? What am I missing?
1
vote
1answer
382 views

How do global cancel/exit commands work in bash?

As I have done multiple times before, I've written bash scripts, and just general commands that go nowhere. They just blink the little command line cursor at me for infinity until I control+C the ...
2
votes
1answer
307 views

Effective handling of variables in non-object oriented programming

What is the best method to use and share variables between functions in non object-oriented program languages? Let's say that I use 10 parameters from DB, ID and 9 other values linked to it. I need ...
1
vote
1answer
916 views

Heredoc or an external template file in my bash script - how it affects readibility/maintanance?

I realise that this question may be down to personal preference but I'm pretty new to Bash / shell scripting so thought it'd be worth some research to see if there's some sort of standard/best ...
13
votes
3answers
3k views

User Configuration of a Shell Script. Best practices?

I am writing a shell script with a few variables that should be configured by the user. There will be an installer for downloading and configuring the script, possibly by asking a series of question. ...
1
vote
1answer
217 views

Do accompanying tools/scripts also need to be licensed to put my bash script under GPLv3?

This is some sort of follow up to an older question of me. So I put the GPLv3 license into the project which contains my script and also added the copyright notice and copying permission statement to ...
5
votes
1answer
2k views

Are these steps enough to put my bash script under GPL 3?

I have written a bash script I would like to put under GPL v3. I've read the GNU documentation on How to Apply These Terms to Your New Programs and How to use GNU licenses for your own software. Still,...
4
votes
2answers
312 views

Are “backwards” terminators for if and case unique to shell scripting?

In bash at least, if and case blocks are closed like this: if some-expr then echo "hello world" fi case $some-var in [1-5]) do-a-thing ;; *) do-another-thing esac as opposed to the ...
10
votes
5answers
6k views

Improving performance for grepping over a huge file

I have FILE_A which has over 300,000 lines and FILE_B which has over 30 million lines. I created a Bash script that greps each line in FILE_A over in FILE_B and writes the result of the grep to a new ...
6
votes
6answers
2k views

PHP as a scripting language [closed]

I have reasonable knowledge of PHP, Perl, and Bash. I use Perl for most text processing on my system (find, replace, filter output, etc). I use PHP for web development, allowing a user to view and ...
9
votes
5answers
4k views

Is it good practice to require a trailing forward slash in directory names?

I want to ask the user of my bash script to pass a directory path as argument. Which one of the following is a good programming practice? Require that the user enter a trailing / (forward slash) ...
53
votes
16answers
50k views

Why such popularity with Python? [closed]

Other than being annoyed at whitespace as syntax, I'm not a hater, I just don't get the fascination with Python. I appreciate the poetry of Perl, and have programmed beautiful web services in bash &...