I would have expected it to be here in the gnu documentation but it is not. So I Googled it and their were many links but I don’t know which one is the most “official”. For example the first hit is for an Ubuntu distribution, and the second is for a Mac OS X distribution. Answer On a typical…
Tag: linux
Bash – How to print multi line strings (with ‘n’) using printf
i’m trying to print a multi line strings in printf this way I can’t do the following Is there any other way? Answer Quoting the variable should do the trick. In your example, however, you are getting double newlines.
Grep regexp for matching ip addresses in a file
I’m trying to search a file “Sessions” that contains IP addresses (among other useless junk). My Grep is failing to match, even though REGEXR is matching perfectly all the IPs perfectly … so I know the REGEX is correct … but when I GREP for this same pattern, not is returned. I&#…
Redirect all output of the java program to log file
I have scheduled my jar file by saving this line at the end of the crontab: Cron has started the job, also created the log file, but there is nothing in that file. Any idea why is that? I am doing System.out.println() in my program. I have added write permissions to everyone for that file. Could it happen tha…
Java Linux Terminal in JPanel
I am making a Scripting Editor and would like to be able to run the Bash/Shell/Python/etc. scripts in the program… So far, I have a way of running them, but there is no way for the scripts to have user input; here’s the code: Any help/ideas are greatly appreciated!!! Answer This is a modification …
Could not install mysql-server inside docker container
I want to configure a container with MySQL, thereafter I will add a java application to the container. But, I could not install MySQL-server inside the container. here is my dockerfile: I got the following error: Errors were encountered while processing: /var/cache/apt/archives/mysql-server-5.5_5.5.44-0ubuntu…
Bash – Delete lines ending with a number
I need to remove only lines (in text file) ending with a number. Before: After: Answer Since you’re referencing my favorite movie, I’ll answer: Which translates to: Delete any line where there is either a space or a tab, followed by at least one digit, then any amount of spaces or tabs at the end …
How to get number of packets received, Average round trip time from ping command if I use popen
I have to ping the given IP address and I need to print the below values in C++. It is fine to use popen and get the output. If I use popen, I will get a file pointer and I need to read on this file pointer to get the whole output and I have to extract the values using
PowerMTA Server Not starting
I have recently installed PowerMTA server on CentOS 6, every prerequisite was installed according to Document and License was entered in correctly configuration file was also correctly setup in /etc/pmta/config but unable to start pmta service and getting this error in logs, Answer You have an invalid license…
Shell : choosing string between two strings using sed
I have a log file in format like this : I want to return all the strings which are between pseudo and pseudoConcat, my desired output is : How can I do this using sed or awk? I’m trying for a few days in vain. Thanks. Answer With GNU grep: Output without trailing spaces: thierry33 i love you With bash: