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93 votes
3 answers
119k views

What are character special and block special files in a unix system? [duplicate]

64 votes
4 answers
349k views

How do I know what service is running on a particular port in linux? [duplicate]

43 votes
3 answers
26k views

What is a "modeless" vs a "modal" editor?

35 votes
2 answers
25k views

What is meant by a shell is in "vi" mode or "emacs" mode?

29 votes
4 answers
7k views

Result of diff two files with switched lines says missing the same line twice

26 votes
5 answers
72k views

What is the difference between ps and top command?

24 votes
1 answer
6k views

How does the command sed '1!G;h;$!d' reverse the contents of a file?

23 votes
4 answers
138k views

Please explain this output of ps -ef command?

22 votes
2 answers
10k views

Expansion of a shell variable and effect of glob and split on it

20 votes
2 answers
6k views

Concept of controlling terminal in Unix

16 votes
5 answers
8k views

Why there are multiple shells in a Unix like system?

15 votes
3 answers
27k views

How does the set-user-ID mechanism work in Unix?

15 votes
1 answer
16k views

What does <defunct> mean in the output of ps?

13 votes
4 answers
2k views

What is the difference between running a executable just by name and by appending a dot /slash before it?

13 votes
3 answers
8k views

How can a log program continue to log to a deleted file?

12 votes
4 answers
24k views

Difference between system calls and library functions

10 votes
3 answers
7k views

What happens to suspended jobs in unix?

9 votes
3 answers
13k views

In Unix speak what is the difference between a shell script and an executable?

8 votes
1 answer
18k views

What does sourcing a file mean in a shell? [duplicate]

8 votes
2 answers
965 views

Grepping for a block of text with parts that can be optional

7 votes
1 answer
5k views

What is advisory locking on files that Unix systems typically employs?

7 votes
1 answer
7k views

What is the difference between exiting a process via Ctrl+C vs issuing a kill -9 command?

6 votes
2 answers
4k views

Please explain the -f option in pgrep

6 votes
1 answer
4k views

Concept of memory mapping in Unix like systems

6 votes
1 answer
21k views

How can I start a VNC server session and immediately land up in KDE?

5 votes
1 answer
2k views

Please explain the output from the jobs command

4 votes
5 answers
7k views

Why does Firefox refuse to die despite killing it with pkill -9?

3 votes
1 answer
2k views

How can I clear portion of what is typed into the prompt while working on Linux and using C-shell?

3 votes
2 answers
2k views

What is meant by stack in connection to a process?

3 votes
2 answers
837 views

What does the term static variable mean in unix speak?