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1500 questions
146
votes
2 answers

How can I verify if TLS 1.2 is supported on a remote web server from the RHEL/CentOS shell?

I'm on CentOS 5.9. I'd like to determine from the linux shell if a remote web server specifically supports TLS 1.2 (as opposed to TLS 1.0). Is there an easy way to check for that? I'm not seeing a related option on openssl but perhaps I'm…
Mike B
  • 12,304
146
votes
7 answers

Where to check log of sendmail?

I can't send out emails, need to look into the logs, but where is the log?
Shore
146
votes
4 answers

robocopy transfer file and not folder

I'm trying to use robocopy to transfer a single file from one location to another but robocopy seems to think I'm always specifying a folder. Here is an example: robocopy "c:\transfer_this.txt" "z:\transferred.txt" But I get this error…
Bill McKay
146
votes
9 answers

How do I get the history of "apt-get install" on Ubuntu?

I am about do move a server from one Ubuntu box to another. I'm not cloning the old box to the new; I'm creating a new system and will move data as needed. I want to install all the software that I have on the old box on the new one. Is there a…
Paul Hoffman
  • 2,384
145
votes
6 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
  • 8,381
145
votes
3 answers

Curl: disable certificate verification

I am developing and I need to access https://localhost. I know the certificate will not match. I just want curl to ignore that. Currently it gives me the following error message: curl: (51) SSL peer certificate or SSH remote key was not OK Is it…
blueFast
  • 4,930
144
votes
11 answers

Run Oracle SQL script and exit from sqlplus.exe via command prompt

I would like to run an Oracle script through SQL Plus via a Windows command prompt. The script does not contain an "exit" command, but I would still like SQL Plus to exit, returning control to the command prompt on completion of the script. My goal…
JoshL
  • 1,635
144
votes
4 answers

Can you help me with my capacity planning?

This is a canonical question about capacity planning Related: How do you do load testing and capacity planning for web sites? How do you do load testing and capacity planning for databases? I have a question regarding capacity planning. Can the…
voretaq7
  • 80,749
144
votes
4 answers

Is my password compromised because I forgot to hit Enter after ssh username?

I've just tried logging into a Fedora (release 13 Goddard) server using SSH (PuTTY, Windows). For some reason the Enter after typing my username didn't go through and I typed in my password and hit Enter again. I only realized my mistake when the…
Jonas Heidelberg
  • 1,204
143
votes
9 answers

Find out symbolic link target via command line

Say that I setup a symbolic link: ln -s /root/Public/mytextfile.txt /root/Public/myothertextfile.txt is there a way to see what the target of myothertextfile.txt is using the command line?
Jared
  • 1,587
143
votes
4 answers

What significance does the user/host at the end of an SSH public key file hold?

I can’t figure out why does an SSH public key file generated by ssh-keygen have a user and host at the end of it. Example: id_rsa.pub ssh-rsa ... rest of file ... /CA9gyE8HRhNMG6ZDwyhPBbDfX root@mydomain Notice the root@mydomain at the end of the…
Basil A
  • 2,300
143
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
  • 2,229
143
votes
13 answers

How do I get apt-get to ignore some dependencies?

How do I make apt-get ignore some dependencies? For example, I wanted to install mailx so I can use it to send email from cron scripts/report-generating tools. However, installing mailx also installs exim4 and a whole bunch of dependencies (I…
FrancisV
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  • 3
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142
votes
5 answers

Clean way to write complex multi-line string to a variable

I need to write some complex xml to a variable inside a bash script. The xml needs to be readable inside the bash script as this is where the xml fragment will live, it's not being read from another file or source. So my question is this if I have a…
ChrisInCambo
  • 1,841
142
votes
4 answers

How do I reattach to Ubuntu Server's 'do-release-upgrade' process?

I accidentally pressed Ctrl+C during Ubuntu Server's do-release-upgrade process. I'd dropped to a shell to compare a .conf file in /etc/. When I pressed Ctrl-C, it asked whether I wanted to try to reattach to the upgrade process, but it failed to do…
Alex Leach
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