A Technical I.T./DevOps Blog
Problem scenario
You compile a C program (with gcc foobar.cc) but you get an error message like this:
basicprog.c:5:13: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘char *’ [-Wformat=]
printf (“y is a %d\n”,y);
What do you do to not get this error?
Solution
While the code compiles, the executable may not run. A compilation error can be benign.
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Learn Windows PowerShell in a Month of Lunches by Manning Publications
Windows PowerShell Cookbook: The Complete Guide to Scripting Microsoft’s Command Shell by O’Reilly Media
Mastering Windows PowerShell Scripting: Automate and manage your environment using PowerShell Core 6.0, 3rd Edition by Packt Publishing
Windows PowerShell and Scripting for Beginners: Complete Beginners Guide to learn Windows PowerShell and its Scripting by Independently published
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Windows PowerShell Step by Step by Microsoft Press
Problem scenario
You want to install Erlang on a Debian or Ubuntu Server (e.g., Linux Mint or Kali Linux). What should you do?
Solution
Run this script with sudo (e.g., sudo bash /tmp/erlang.sh):
# Written by www.continualintegration.com
#/bin/bash
echo “This script can take 20 minutes to run”
apt -y update
apt -y install autoconf
apt -y install libncurses5-dev
apt -y install libncursesw5-dev
apt -y install gcc
apt -y install python3
apt -y install make
cd /bin/
git clone https://github.com/erlang/otp.git
cd otp
./otp_build autoconf
./configure
echo “This next portion may take 15 minutes”
date /tmp/datetime.txt
make
make install
ln -s /usr/local/lib/erlang/bin/erl /usr/bin/erl
ln -s /usr/local/bin/erlc /usr/bin/erlc
ln -s /etc/alternatives/python3 /usr/bin/python
echo “Script run completed.”
echo ” ”
echo “Many errors above (if there are any) may be ignorable”
echo “try the ‘erl’ command with no quotes to see if Erlang was installed”
echo ‘If you get to a carrot prompt, …
Continue reading “How Do You Install Erlang on a Debian/Ubuntu Server?”
One or more of the following problems are happening to you:
Problem scenario #1
You run python3 setup.py install on RHEL 8.x, but you get an error message like this:
running install
error: can’t create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:
[Errno 2] No such file or directory: ‘/usr/local/lib/python3.6/site-packages/test-easy-install-52191.write-test’
The installation directory you specified (via –install-dir, …
Problem scenario
You are using Debian or Ubuntu Linux. You want to install Kotlin. What do you do?
Solution
Prerequisite
Install Java. If you need assistance, see this posting.
Procedure
Run this command: sudo snap install –classic kotlin
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Continue reading “How Do You Install Kotlin on a Debian/Ubuntu Distribution of Linux?”
Problem scenario
You want to install Erlang on a Linux SUSE machine. What should you do?
Solution
Run this script with sudo (e.g., sudo bash /tmp/erlang.sh):
# Written by www.continualintegration.com
#/bin/bash
widgetversion=3.0.4
echo “This script can take 20 minutes to complete”
zypper -n install ncurses gcc-c++ autoconf make git python3 bzip2 gtk2 gtk3 gtk2-devel ncurses-utils ncurses-devel
cd /tmp/
curl -Ls https://github.com/wxWidgets/wxWidgets/releases/download/v$widgetversion/wxWidgets-$widgetversion.tar.bz2 /tmp/wxWidgets-$widgetversion.tar.bz2
cp /tmp/wxWidgets-$widgetversion.tar.bz2 /bin/
cd /bin/
bzip2 -d wxWidgets-$widgetversion.tar.bz2
tar -xf wxWidgets-$widgetversion.tar
#cd wxWidgets-$widgetversion
cd /bin/
git clone https://github.com/erlang/otp.git
cd otp
./otp_build autoconf
./configure
echo “This next portion may take 15 minutes”
date /tmp/datetime.txt
make
make install
ln -s /usr/local/lib/erlang/bin/erl /usr/bin/erl
ln -s /usr/local/bin/erlc /usr/bin/erlc
ln -s /etc/alternatives/python3 /usr/bin/python
echo “Script run completed.”
echo ” ”
echo “Many errors above (if there are any) may be ignorable”
echo “try the ‘erl’ command with no quotes to see if Erlang was installed”
echo ‘If you get to a carrot prompt, …
Continue reading “How Do You Install Erlang on a Linux SUSE Server?”
Problem scenario
You know a string is buried in a series of web pages. How do you get Python to read the web pages and find the string?
Solution
Change the URLs as you desire. Change the “searchterm” variable assignment to the word of your choice. Then run this Python 3 program:
import re
import requests
listofurls = [‘https://www.continualintegration.com/’, ‘https://www.continualintegration.com/miscellaneous-articles/page/1/’, …
Continue reading “How Do You Get Python to Parse Web Pages to Find a String?”
Problem scenario
Presto will not run because of an error about the JVM.
You get a message like this:
“Java version has an unknown format: 15” (from “C” below)
“Presto requires an Oracle or OpenJDK JVM (found Ubuntu)” (associated with the Java version shown in B or D below)
“Presto requires an Oracle or OpenJDK JVM (found Private Build)” (associated with the Java version in E below)
“Presto requires an Oracle or OpenJDK JVM (found IcedTea)” (associated with the Java version shown in F below)
Solution
For detailed background information,
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Problem scenario
You are trying to run a Python program with a class. You get this message:
File “foobar.py”, line 11, in
class Building(param1, param2):
NameError: name ‘param1’ is not defined
What should you do?
Solution
Use the word “object” instead of one or more parameters that you are passing in the parentheses () of the class.
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Continue reading “How Do You Troubleshoot the Python Error “NameError: name ” is not defined”?”
Problem scenario
You are running Vagrant, Ruby or a Ruby application, but you get this error: “/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:83:in `require’: cannot load such file — foobar (LoadError)”
What should you do?
Possible Solution #1
Try to run the original command with “sudo”. If that doesn’t work, use “gem list” to verify “foobar” is installed.
For Windows users, try to run the command or application as Administrator.
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