How to count lines in a document?
Use wc: This will output the number of lines in <filename>: Or, to omit the <filename> from the result use wc -l < <filename>: You can also pipe data to wc as well:
opareting system
Snort Message – WARNING: No preprocessors configured for policy 0
I have installed and configured snort 2.9.7.2 and it is running without a problem. However, my question is: what does the following warning mean? “No preprocessors configured for policy 0” This message shows when I run the command:
xcopy returns error “Invalid number of parameters” when exclude parameter is set
XCOPY is an old command harking back to the days of DOS. It looks like the /EXCLUDE option was never updated to support long file names. Ugh š If you remove the quotes, then the text after the space is interpreted as an additional parameter, and you get the “Invalid number of parameters” error. If … Read more
Implementing shell in C and need help handling input/output redirection
You have way too many file descriptors open after your redirection. Let’s dissect the two paragraphs: I’m going to be charitable and ignore the fact that you are ignoring errors. However, you will need to error check your system calls. In the first paragraph, you open a file and capture the file descriptor (it might … Read more
What is the difference between /etc/rc.local and ~/.bashrc?
The difference is in when they are run and who they’re running as when run i.e. rc.local is run on a change of run level and it runs as root. bashrc is bash specific and run on a non login shell as a particular user. You can find a good explanation of rc.local here The script /etc/rc.local … Read more
What are the differences between virtual memory and physical memory?
Softwares run on the OS on a very simple premise – they require memory. The device OS provides it in the form of RAM. The amount of memory required may vary – some softwares need huge memory, some require paltry memory. Most (if not all) users run multiple applications on the OS simultaneously, and given … Read more
How to open an elevated cmd using command line for Windows?
I ran into the same problem and the only way I was able to open the CMD as administrator from CMD was doing the following: Open CMD Write powershell -Command “Start-Process cmd -Verb RunAs” and press Enter A pop-up window will appear asking to open a CMD as administrator
How to run PowerShell in CMD
You need to separate the arguments from the file path: Another option that may ease the syntax using the File parameter and positional parameters:
tar: Cowardly refusing to create an empty archive
You defined what to exclude, but didn’t define what you actually want in the archive. Supply at least one path. If you want entire filesystem, thenĀ tar -c……. /
Python not working in the command line of git bash
Temporary solution Just enter this in your git shell on windows – > alias python=’winpty python.exe’, that is all and you are going to have alias to the python executable. This alias will be valid for the duration of the shell session. winpty is a Windows software package providing an interface similar to a Unix pty-master for … Read more