I want to know what exactly are Linux commands? &amp; how to identify and locate them?  In other words what are different kind/type/category of commands? How to identify them and locate (source) it.
50320
What can I type at my shell (which happens to be bash) that will list all the commands that are recognized?  Also, does this differ by shell? Or do all shells just have a "directory" of commands they recognize?  Secondly, different question, but how can I override any of those? In other words how can I write my own view command to replace the one existing on my Ubuntu system, which appears to just load vim.
76628
I need to list the process IDs on the Linux command line. Can I use the ls command in the /proc directory?  The problem is that it lists some process IDs with file names. Can I remove those names using some ls command option?
7483
Total Ubuntu/Linux in general noob here.   What is the difference between /home and /Home ? I've noticed I need to use sudo to do anything in /home. /Home (home folder?) has pictures, videos, etc. in it so thats where I want to really create new folders and stuff but I can't seem to get to it using cd.
21492
Using the following command, could someone please explain what exactly is the purpose for the ending curly braces ({}) and plus sign (+)?  And how would the command operate differently if they were excluded from the command?  find . -type d -exec chmod 775 {} +
58754
I often run commands in parallel that take a long time to finish and sometimes I lose track of what is running where since they output basically the same sort of information on screen.   Do you know of any way to find out what command is running in what terminal?
97573
I want to understand what mounting is. It is used in different contexts and situations and I can't find resources which:   Describe the mount concept Explain the actions taken by the computer/OS/utility when a mount is performed How and in which situations mount is used Which features in the Linux mount command are of frequent use and some examples   ( I hear mount applied to diverse entities directories, flash drives, network card, etc )
111568
A couple well known command line tools exist in several versions depending on the Unix flavor (like sed, find, ld).  I was wondering which versions are available in Ubuntu (I assume GNU for all but I'd like to confirm that)?
73460
I am having a hard time grasping what dot-files are or what they are for. Are they directories? How do I navigate to them?  Thank you!
12192
By typing a manually specified command in terminal I want to execute some other command.  How could add an alias to a command? Can i do that with the help of the terminal or should I edit some kind of file?
63159
I was just running a few commands in a terminal and I started wondering, does Unix/Linux take shortcuts when running piped commands?  For example, let's say I have a file with one million lines, the first 10 of which contain hello world. If you run the command grep "hello world" file | head does the first command stop as soon as it finds 10 lines, or does it continue to search the entire file first?
85780
I would like to know which are the standard commands available in every Linux system.  For example if you get a debian/ubuntu/redhat/suse/arch/slackware etc, you will always find there commands like:  cd, mkdir, ls, echo, grep, sed, awk, ping etc.  I know that some of the mentioned commands are shell-builtin but others are not but they are still always there (based on my knowledge and experience so far).   On the other hand commands like gawk, parted, traceroute and other quite famous commands are not installed by default in different Linux distributions.  I made different web searches but I haven't found a straight forward answer to this.  The purpose is that I would like to create a shell script and it should make some sanity checks if the commands used in the script are available in the system. If not, it should prompt the user to install the needed binaries.
3824
How do I save the output of a command to a file?  Is there a way without using any software? I would like to know how.
1444
I see that Stack&nbsp;Overflow is very Linux specific. Doesn't Unix &amp; Linux and Ask&nbsp;Ubuntu cover much of the same ground? I see that Unix &amp; Linux and Server&nbsp;Fault also cater to many Linux server questions. Similarly, Ask&nbsp;Ubuntu and Super&nbsp;User seems to contain most like questions.
98993
How do we extend a command to the next line? Basically whats the windows alternative for Linux's ls -l \ /usr/  Here we use backslashes to extend the command onto the next lines. What's the equivalent for Windows?
98989
I have installed some apps through the Ubuntu Software center. How can I find the corresponding terminal command? For many apps, this is not the same as the displayed name. For example, the app called Text Editor can also be launched by typing "gedit" in the terminal, but how can I find this for other apps?
83186
Often times I will ssh into a new client's box to make changes to their website configuration without knowing much about the server configuration. I have seen a few ways to get information about the system you're using, but are there some standard commands to tell me what version of Unix/Linux I'm on and basic system information (like if it is a 64-bit system or not), and that sort of thing?  Basically, if you just logged into a box and didn't know anything about it, what things would you check out and what commands would you use to do it?
25849
Can anyone tell me the difference between ctrl+z and ctrl+c?  When I am in the terminal, both the combinations stop the current process, but what exactly is the difference between both?