Most Popular

1500 questions
3 answers

Why does man print "gimme gimme gimme" at 00:30?

We've noticed that some of our automatic tests fail when they run at 00:30 but work fine the rest of the day. They fail with the message gimme gimme gimme in stderr, which wasn't expected. Why are we getting this output?
Jaroslav Kucera
  • 9,007
  • 5
  • 13
  • 27
10 answers

What is the exact difference between a 'terminal', a 'shell', a 'tty' and a 'console'?

I think these terms almost refer to the same thing, when used loosely: terminal shell tty console What exactly does each of these terms refer to?
  • 33,497
  • 24
  • 68
  • 74
16 answers

How do I get the size of a directory on the command line?

I tried to obtain the size of a directory (containing directories and sub directories) by using the ls command with option l. It seems to work for files (ls -l file name), but if I try to get the size of a directory (for instance, ls -l /home), I…
Abdul Al Hazred
  • 23,792
  • 22
  • 62
  • 85
12 answers

How to correctly add a path to PATH?

I'm wondering where a new path has to be added to the PATH environment variable. I know this can be accomplished by editing .bashrc (for example), but it's not clear how to do this. This way: export PATH=~/opt/bin:$PATH or this? export…
  • 16,105
  • 10
  • 29
  • 40
10 answers

How to copy files from one machine to another using ssh

I'm using Linux (centos) machine, I already connected to the other system using ssh. Now my question is how can I copy files from one system to another system? Suppose, in my environment, I have two system like System A and System B. I'm using…
  • 14,809
  • 8
  • 18
  • 21
9 answers

How to install a deb file, by dpkg -i or by apt?

I have a deb package for installation. Shall I install by dpkg -i my.deb, or by apt? Will both handle the software dependency problem well? If by apt, how can I install from the deb by apt?
  • 92,534
  • 165
  • 512
  • 896
10 answers

How can I replace a string in a file(s)?

Replacing strings in files based on certain search criteria is a very common task. How can I replace string foo with bar in all files in the current directory? do the same recursively for sub directories? replace only if the file name matches…
  • 220,769
  • 58
  • 415
  • 622
3 answers

How to unfreeze after accidentally pressing Ctrl-S in a terminal?

It's a situation that has happened quite often to me: after I press (with a different intention) Ctrl-S in a terminal, the interaction (input or output) with it is frozen. It's probably a kind of "scroll lock" or whatever. How do I unfreeze the…
imz -- Ivan Zakharyaschev
  • 14,533
  • 12
  • 58
  • 118
2 answers

Why was '~' chosen to represent the home directory?

I have often wondered why the ~ (tilde) represents the home directory of a user. Is there a reason behind this, or is it just some infrequently used character?
Lelouch Lamperouge
  • 6,859
  • 3
  • 14
  • 11
6 answers

How to see full log from systemctl status service?

I check service status with systemctl status service-name. By default, I see few rows only, so I add -n50 to see more. Sometimes, I want to see full log, from start. It could have 1000s of rows. Now, I check it with -n10000 but that doesn't look…
  • 8,629
  • 4
  • 14
  • 16
13 answers

How do I grep for multiple patterns with pattern having a pipe character?

I want to find all lines in several files that match one of two patterns. I tried to find the patterns I'm looking for by typing grep (foo|bar) *.txt but the shell interprets the | as a pipe and complains when bar isn't an executable. How can I…
  • 9,122
  • 5
  • 24
  • 38
2 answers

How do I make `ls` show file sizes in megabytes?

What commands do I need for Linux's ls to show the file size in MB?
Paul Sheldrake
  • 7,913
  • 3
  • 13
  • 10
3 answers

What is the purpose of the lost+found folder in Linux and Unix?

There is a folder at the root of Linux and Unix operating systems called /lost+found/ What is it for? Under what circumstances would I interact with it? How would I interact with it?
  • 13,563
  • 12
  • 34
  • 49
6 answers

How to run find -exec?

I'd like to find the files in the current directory that contain the text "chrome". $ find . -exec grep chrome find: missing argument to `-exec' What am I doing wrong?
  • 29,573
  • 43
  • 82
  • 90
40 answers

Tracking down where disk space has gone on Linux?

When administering Linux systems I often find myself struggling to track down the culprit after a partition goes full. I normally use du / | sort -nr but on a large filesystem this takes a long time before any results are returned. Also, this is…
Owen Fraser-Green
2 3
99 100