Louis I.

05/26/19

Loop through an array of strings in Bash?

I want to write a script that loops through 15 strings (array possibly?) Is that possible? Something like: for databaseName in listOfNames then # Do something end

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Computer Programming Computer Science Computer Engineering

05/24/19

What is the pass rate for the CCNA exam?

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Answers •1

C++

05/21/19

Is there a technical reason to use > (<) instead of != when incrementing by 1 in a 'for' loop?

I almost never see a `for` loop like this: for (int i = 0; 5 != i; ++i) {}Is there a technical reason to use `>` or `<` instead of `!=` when incrementing by 1 in a `for` loop? Or this... more

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Answers •1

C

05/21/19

Core dumped, but core file is not in the current directory?

While running a C program, It says *"(core dumped)"* but I can't see any files under the current path.I have set and verified the `ulimit`: ulimit -c unlimited ulimit -a I also tried to find... more

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Answers •1

C

05/20/19

Why do you have to link the math library in C?

If I include `<stdlib.h>` or `<stdio.h>` in a C program I don't have to link these when compiling but I do have to link to `<math.h>`, using `-lm` with gcc, for example: gcc... more

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Answers •1

C

05/20/19

How to initialize all members of an array to the same value?

I have a large array in C (not C++ if that makes a difference). I want to initialize all members to the same value. I could swear I once knew a simple way to do this. I could use `memset()` in my... more

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Answers •1

Python List

05/17/19

How do I remove an element from a list by index in Python?

How do I remove an element from a list by index in Python?I found the `list.remove` method, but say I want to remove the last element, how do I do this? It seems like the default remove searches... more

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Answers •1

Linux File Symlink

05/14/19

Remove a symlink to a directory?

I have a symlink to an important directory. I want to get rid of that symlink, while keeping the directory behind it. I tried `rm` and get back `rm: cannot remove 'foo'`. I tried `rmdir` and got... more

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Answers •1

Linux Unix Grep

05/14/19

How can I exclude directories from grep -R?

I want to traverse all subdirectories, except the "node_modules" directory.

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Answers •2

Linux Unix Grep

05/14/19

How can I exclude directories from grep -R?

I want to traverse all subdirectories, except the "node_modules" directory.

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Answers •2

Java

05/12/19

Double-entry accounting libraries for Java?

What double-entry accounting libraries are available for Java?

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Answers •1

Sql

05/12/19

How to reset AUTO_INCREMENT in MySQL?

How can I ***reset*** the `AUTO_INCREMENT` of a field? I want it to start counting from `1` again.

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Answers •1

C Unix Segmentation Fault

05/11/19

What is a bus error?

What does the "bus error" message mean, and how does it differ from a segfault?

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Answers •2

Html

05/11/19

Two submit buttons in one form?

I have two *submit* buttons in a form. How do I determine which one was hit serverside?

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Answers •1

Linux Scripting Bash

05/06/19

How do I prompt for Yes/No/Cancel input in a Linux shell script?

I want to pause input in a shell script, and prompt the user for choices. The standard 'Yes, No, or Cancel' type question. How do I accomplish this in a typical bash prompt?

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Answers •2

Java

05/05/19

How to update a value, given a key in a java hashmap?

Suppose we have a `HashMap<String, Integer>` in Java. How do I update (increment) the integer value of the string key for each existence of the string I find? One could remove and reenter the... more

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Answers •1

C

05/05/19

Using boolean values in C?

C doesn't have any built-in boolean types. What's the best way to use them in C?

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Answers •1

Unix Cut Bash

05/05/19

How to make the 'cut' command treat same sequental delimiters as one?

I'm trying to extract a certain (the fourth) field from the column-based, 'space'-adjusted text stream. I'm trying to use the `cut` command in the following manner: `cat text.txt | cut -d " " -f... more

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Computer Programming

05/05/19

How do you stop interim solutions from lasting forever?

Say there are two possible solutions to a problem: the first is quick but hacky; the second is preferable but would take longer to implement. You need to solve the problem fast, so you decide to... more

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Java

05/05/19

Library for polynomial calculus in Java?

Are there any (preferably open source) library for Java that allows one to do calculus with polynomial e.g. addition, multiplying, dividing by constans etc. ? Also if it would be capable to... more

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Linux Unix Bash

05/04/19

Aborting a shell script if any command returns a non-zero value?

I have a Bash shell script that invokes a number of commands. I would like to have the shell script automatically exit with a return value of 1 if any of the commands return a non-zero value. Is... more

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Answers •2

Linux Unix Bash

05/04/19

Aborting a shell script if any command returns a non-zero value?

I have a Bash shell script that invokes a number of commands. I would like to have the shell script automatically exit with a return value of 1 if any of the commands return a non-zero value. Is... more

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Answers •2

Unix Bash Shell

05/03/19

Bash tool to get nth line from a file?

Is there a "canonical" way of doing that? I've been using `head -n | tail -1` which does the trick, but I've been wondering if there's a Bash tool that specifically extracts a line (or a range of... more

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Unix Cut Bash

05/03/19

use space as a delimiter with cut command?

I want to use space as a delimiter with the `cut` command. What syntax can I use for this?

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Answers •1

Unix

05/02/19

sometimes my file just freezes in my vi |vim, what happened?

Sometimes when I edit my file using vi or vim, my file just freezes. Even if I type <kbd>Ctrl+C</kbd> or <kbd>Ctrl+D</kbd>, it still freezes there. I `kill -9 <pid>`... more

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Answers •1

Loop through an array of strings in Bash?

What is the pass rate for the CCNA exam?

Is there a technical reason to use > (<) instead of != when incrementing by 1 in a 'for' loop?

Core dumped, but core file is not in the current directory?

Why do you have to link the math library in C?

How to initialize all members of an array to the same value?

How do I remove an element from a list by index in Python?

Remove a symlink to a directory?

How can I exclude directories from grep -R?

How can I exclude directories from grep -R?

Double-entry accounting libraries for Java?

How to reset AUTO_INCREMENT in MySQL?

What is a bus error?

Two submit buttons in one form?

How do I prompt for Yes/No/Cancel input in a Linux shell script?

How to update a value, given a key in a java hashmap?

Using boolean values in C?

How to make the 'cut' command treat same sequental delimiters as one?

How do you stop interim solutions from lasting forever?

Library for polynomial calculus in Java?

Aborting a shell script if any command returns a non-zero value?

Aborting a shell script if any command returns a non-zero value?

Bash tool to get nth line from a file?

use space as a delimiter with cut command?

sometimes my file just freezes in my vi |vim, what happened?

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