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Linux: Start Command In Background

I am a new Linux command line user. How do I start or run command in the background so that I can access command prompt immediately?
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I have Debian / Ubuntu Linux. I need to compile software written in C. The gcc throwing an error that read as follows:

gnu/stubs-32.h: No such file or directory compilation terminated. make: *** [foo.o] Error 1

How do I fix this problem under Debian or Ubuntu Linux 64 bit system and compile apps using gcc compiler?
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When I type find . -type d -name "foo" command I get Permission denied error messages. How do I exclude all "permission denied: messages from the find command under Linux or Unix like operating systems?
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HowTo: Use pwd Command In Linux / UNIX

How do I use the pwd command in Linux or Unix like operating systems? How can I use pwd command in UNIX or Linux shell scripts for automation purpose?
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I recently updated my Mozilla Firefox. Firefox now includes a built-in PDF viewer that allows me to see PDF files found on the web without a plugin. The built-in PDF viewer is enabled by default. However, I found that this pdf viewer is not working properly with various web-sites, and it works slowly. How do disable the built-in PDF viewer so that I can use the Adobe PDF viewer or other PDF viewer that is shipped with my operating systems?
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Vi / Vim: Save And Quit The Editor Command

I am a new vi (vim) text editor user. How do I quit the vi editor and save my changes under Linux or Unix like operating systems?
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Linux/Unix: Cat Command Display Line Numbers

How do I use the cat command to display the line numbers for a file called myapp.c under Linux or Unix like operating systems?
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