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1500 questions
130
votes
4 answers

In systemd, what's the difference between After= and Requires=?

I'm creating a systemd .service file and I need help understanding the difference between Requires= and After=. The man page says that Requires= "Configures requirement dependencies on other units." and After= "Configures ordering dependencies…
TomOnTime
  • 8,131
129
votes
11 answers

FreeBSD: Directory called ^C (really!) - how to remove?

I made a typo: $ history 169 9:34 la /usr/local/etc/ 170 9:35 sudo mkdir ^C 171 9:36 sudo mkdir /usr/local/etc/dnsmasq.d Now I have a file that is called ^C (ctrl+C)!! When I use ls I just see a questionmark (probably due to the locale?) %…
Mausy5043
  • 1,347
129
votes
4 answers

All servers flooded by salt water, is it possible to recover data from multi-platter drives?

All of my servers are currently flooded by salt water. Is it possible for each platter in a multi-platter drive to be separated, cleaned, imaged, and merged into a new virtual drive for data recovery?
michael
129
votes
3 answers

How can I rename a Unix user?

I have a user named hedgehog and I want him to be named squirrel, but I don't want to change his numeric user ID. How can I accomplish this?
Szymon Jeż
  • 3,477
129
votes
18 answers

Why does sudo command take long to execute?

I've been picking up Linux (Fedora 10, then 11) over the past few months (and enjoying it immensely-- it's like discovering computers all over again, so many things to learn). I've added my user to the last line of the /etc/sudoers file as shown…
Cuga
  • 101
129
votes
14 answers

Why is RAID not a backup?

When someone mentions RAID in a conversation about backups, invariably someone declares that "RAID is not a backup." Sure, for striping, that's true. But what's the difference between redundancy and a backup?
jldugger
  • 14,462
128
votes
9 answers

How can I monitor hard disk load on Linux?

Is there a good command line utility to monitor hard disk load on linux? Something like top but then monitoring disk activity i.s.o. cpu usage. More specifically, I suspect that for some (heavy load) servers after several optimizations on various…
Pieter
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128
votes
11 answers

Prevent duplicate cron jobs running

I have scheduled a cron job to run every minute but sometimes the script takes more than a minute to finish and I don't want the jobs to start "stacking up" over each other. I guess this is a concurrency problem - i.e. the script execution needs to…
Tom
  • 4,367
128
votes
15 answers

What's the reverse DNS command line utility?

What's the command to find the name of a computer given its IP address? I always forget what this command is, but I know it exists in Windows and I assume it exists on the *nix command-line.
Peter Turner
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128
votes
10 answers

How to extend an ext4 partition and filesystem?

I have a 400GB disk with a 320GB ext4 partition. I would like to grow the ext4 partition to use the left space (80GB of free space). +--------------------------------+--------+ | ext4 | Free …
mimipc
  • 2,067
128
votes
15 answers

Mount CIFS Host is down

I have an issue with a mount point that was previously configured. It shows the folder, but the mount is missing and holds "?" values for size, permissions, etc. So I tried to remount using cifs and the same command from before: mount -t cifs…
Kevin
  • 1,413
128
votes
4 answers

Amazon EC2 terminology - AMI vs. EBS vs. Snapshot vs. Volume

I have been poking around Amazon EC2, and am a little confused on some of the terminology. Specifically with regard to AMI, snapshots and volumes, and an EBS Please correct me if I am wrong, or fill in any serious gaps in my following…
Matt
  • 3,251
128
votes
4 answers

How to check if a port is blocked on a Windows machine?

On the Windows platform, what native options to I have to check if a port (3306, for example) on my local machine (as in localhost), is being blocked?
Boris Pavlović
  • 1,393
128
votes
2 answers

Colors in bash after piping through less?

When I have dircolors defined life is full of... color. When I pipe ls through less to scroll around I lose the colors. Any suggestions?
MathewC
  • 6,987
128
votes
18 answers

Switching to IPv6 implies dropping NAT. Is that a good thing?

This is a Canonical Question about IPv6 and NAT Related: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? How can I 'dip my toes' into dynamic IPv6 network addressing? IPv6 without nat but what about an isp change? Our…
Ernie
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