connect to host localhost port 22: Connection refused
While installing hadoop in my local machine , i got following error can some one help me to resolve this error , than changing port number
linux
Installing jdk8 on ubuntu- “unable to locate package” update doesn’t fix
I’ve been trying to install the jdk on my ubuntu after downloading it. first I’ve used: sudo apt-get update then: sudo apt-get install jdk* (because I didn’t want to write the whole long name). it didn’t work- printed the message in the title. I thought the problem might me with the directory I’m executing from … Read more
Bash script: bad interpreter
The first line, #!/bin/bash, tells Linux where to find the interpreter. The script should also be executable with chmod +x script.sh, which it appears you did. It is highly likely that you created this file with a windows editor, which will place a <cr><lf> at the end of each line. This is the standard under … Read more
error: aggregate value used where an integer was expected
You are failing to access a field of the indexed union array: mydata[0] is a value of type union data, and can’t be cast to uint64_t. You need to access the proper union member: to select the uint64_t value. No need for the cast. Also: Use PRIu64 to portably print 64-bit values, you can’t assume … Read more
scp from Linux to Windows
This one worked for me.
npm update broke npm
You probably have npm installed twice, one is in /usr/local/bin and the other in /usr/bin. First, you can try to remove the npm module that has been installed by upgrading npm. Try to run this: rm -r /usr/local/lib/node_modules/npm /usr/bin/npm uninstall npm Once you have a running version of npm, install a more recent version of … Read more
Pycharm and sys.argv arguments
In PyCharm the parameters are added in the Script Parameters as you did but, they are enclosed in double quotes “” and without specifying the Interpreter flags like -s. Those flags are specified in the Interpreter options box. Script Parameters box contents: Interpeter flags: Or, visually: Then, with a simple test file to evaluate: We … Read more
Merge / convert multiple PDF files into one PDF
I’m sorry, I managed to find the answer myself using google and a bit of luck : ) For those interested; I installed the pdftk (pdf toolkit) on our debian server, and using the following command I achieved desired output: OR This in turn can be piped directly into pdf2ps.
CentOS error – sudo: effective uid is not 0, is sudo installed setuid root?
The problem is that you probably changed permissions to the directory /usr/bin. To resolve that : 1) First be sure that root is owner of this directory /usr/bin : 2) and change permission for this directory :
Explanation of polkitd Unregistered Authentication Agent
Policykit is a system daemon and policykit authentication agent is used to verify identity of the user before executing actions. The messages logged in /var/log/secure show that an authentication agent is registered when user logs in and it gets unregistered when user logs out. These messages are harmless and can be safely ignored.