User Geek

109 votes

3 answers

136k views

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

asked Jan 2, 2013 at 6:22

75 votes

4 answers

443k views

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

asked Jan 23, 2013 at 8:58

46 votes

3 answers

33k views

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

asked Dec 6, 2012 at 6:10

41 votes

2 answers

29k views

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

asked Aug 3, 2013 at 6:51

31 votes

4 answers

8k views

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

asked Jul 25, 2014 at 10:22

30 votes

5 answers

87k views

What is the difference between ps and top command?

asked Jan 22, 2013 at 15:58

25 votes

2 answers

12k views

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

asked Jan 12, 2014 at 8:54

24 votes

1 answer

6k views

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

asked Sep 30, 2015 at 14:04

24 votes

4 answers

152k views

Please explain this output of ps -ef command?

asked Jan 22, 2013 at 16:23

21 votes

2 answers

6k views

Concept of controlling terminal in Unix

asked Dec 11, 2012 at 15:34

17 votes

4 answers

31k views

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

asked Dec 11, 2012 at 12:00

16 votes

5 answers

9k views

Why there are multiple shells in a Unix like system?

asked Nov 29, 2012 at 12:10

15 votes

1 answer

18k views

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

asked Jan 24, 2013 at 17:44

14 votes

4 answers

25k views

Difference between system calls and library functions

asked Nov 30, 2012 at 12:18

14 votes

3 answers

9k views

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

asked Jul 28, 2014 at 7:46

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?

asked Jan 22, 2013 at 9:04

11 votes

3 answers

8k views

What happens to suspended jobs in unix?

asked Jan 21, 2013 at 17:30

9 votes

1 answer

8k views

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

asked Jan 23, 2013 at 10:03

9 votes

3 answers

14k views

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

asked Dec 10, 2012 at 8:11

8 votes

1 answer

19k views

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

asked Feb 5, 2013 at 9:55

8 votes

1 answer

6k views

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

asked Jul 30, 2014 at 10:00

8 votes

2 answers

1k views

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

asked Jun 26, 2014 at 16:16

6 votes

1 answer

23k views

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

asked Mar 9, 2017 at 5:56

6 votes

5 answers

9k views

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

asked Mar 7, 2013 at 9:40

6 votes

2 answers

4k views

Please explain the -f option in pgrep

asked Jan 23, 2013 at 19:02

6 votes

1 answer

2k views

Please explain the output from the jobs command

asked Jan 21, 2013 at 17:18

6 votes

1 answer

4k views

Concept of memory mapping in Unix like systems

asked Dec 7, 2012 at 10:22

4 votes

2 answers

8k views

Home directory vs Working directory

asked Nov 29, 2012 at 12:59

4 votes

2 answers

2k views

What allows a command to be typed while the previous command is still running in foreground?

asked May 27, 2015 at 9:01

3 votes

3 answers

2k views

Why only one active group at a time?

asked Aug 26, 2014 at 13:30

Stack Exchange Network

53 Questions

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

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

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

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

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

What is the difference between ps and top command?

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

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

Please explain this output of ps -ef command?

Concept of controlling terminal in Unix

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

Why there are multiple shells in a Unix like system?

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

Difference between system calls and library functions

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

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

What happens to suspended jobs in unix?

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

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

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

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

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

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

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

Please explain the -f option in pgrep

Please explain the output from the jobs command

Concept of memory mapping in Unix like systems

Home directory vs Working directory

What allows a command to be typed while the previous command is still running in foreground?

Why only one active group at a time?