Pierre's questions -server

Pierre

Asked: 2014-06-14 01:01:00 +0800 CST

Tracking the linux config with git: how?

0

I'd like to track my linux configurations with git.

My idea is to have a branch for each server.
/etc is not the only one directory to be tracked (I won't git init in '/etc' )

As far as I could see, it is possible to init a git for a distant directory.

I tried this:

# mkdir -p /git/.git
# cd /git
# git --work-tree=/ --git-dir=/git/.git init
Initialized empty Git repository in /git/.git/

1) Creating a new branch before everything is not possible

# git branch server1
fatal: Not a valid object name: 'HEAD'.

2) adding a file in master/HEAD is not possible

# touch README.md
# git add README.md 
fatal: Unable to create '//.git/index.lock': No such file or directory

how should I properly setup git to track my system-config ?

Thanks.

P.

Pierre

Asked: 2013-01-10 02:19:45 +0800 CST

Apache2/glassfish|tomcat: Redirecting some (but not all) requests on 80 to glassfish on port 8080, where is the admin screen?

1

Using that answer: How to redirect traffic on port 80 to Tomcat port 8080 whilst still allowing the server to send/receive on port 80

I've configured my apache2 server to redirect some requests to glassfish on 8080:

<VirtualHost *:80>
(...)
ProxyPass /tomcat/ http://localhost:8080/
ProxyPassReverse /tomcat/ http://localhost:8080/
ProxyPass /tomcat-admin/ http://localhost:4848/
ProxyPassReverse /tomcat-admin/ http://localhost:4848/
</VirtualHost>

On http://my.server.org/tomcat/ , I can clearly see:

 GlassFish Server 3.1.2
Your server is now running

but http://my.server.org/tomcat-admin/ returns a blank screen , but I can see the HTML source of the admin page, so I suppose that some resources cannot be loaded. How should I fix this ?

Another question: if my java web application use httpS, should I just add:

ProxyPass /tomcat-secure/ http://localhost:8443/
ProxyPassReverse /tomcat-secure/ http://localhost:8443/
</VirtualHost>

?

Pierre

Asked: 2012-11-01 05:45:53 +0800 CST

Is it safe to publicly tell the IP of my proxy?

1

I'm working behind a proxy and I save my code using github.com .

My snippets of java code contain some system parameters to tell java about our proxy:

    System.setProperty("http.proxyHost", "xxxxxxxxx");
    System.setProperty("http.proxyPort", "1234");

aside from specifying those parameters on the command line or storing them in a config file, is it safe to publish this IP on a public server ? Could a hacker use it to attack my server ?

Pierre

Asked: 2012-11-01 01:24:47 +0800 CST

chown: changing ownership of `.': Invalid argument

8

I'm trying to install some new files on our new server while our sysadmin is in holidays:

Here is my df

#  df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb3             273G   11G  248G   5% /
tmpfs                  48G  260K   48G   1% /dev/shm
/dev/sdb1             485M  187M  273M  41% /boot
xxx.xx.xxx.xxx:/commun
                       63T  2.2T   61T   4% /commun

as root , I can create a new directory and run chown under /home/lindenb

# cd /home/lindenb/
# mkdir X
# chown lindenb X

but I cannot run the same command under /commun

# cd /commun/data/users/lindenb/
# mkdir X
# chown lindenb X
chown: changing ownership of `X': Invalid argument

why ? how can I fix this ?

updated:

mount:

/dev/sdb3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sdb1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
xxx.xx.xxx.xxx:/commun on /commun type nfs (rw,noatime,noac,hard,intr,vers=4,addr=xxx.xx.xxx.xxx,clientaddr=xxx.xx.xxx.xxx)

version:

$ cat /etc/redhat-release 
CentOS release 6.3 (Final)

Pierre

Asked: 2011-07-28 00:34:58 +0800 CST

PERL+mysql: undefined symbol: mysql_init

1

I've updated mysql (client+server+dev) from the rpms available on mysql.com.

rpm -i MySQL-server-5.5.14-1.linux2.6.x86_64.rpm
rpm -i MySQL-client-5.5.14-1.linux2.6.x86_64.rpm
rpm -i MySQL-devel-5.5.14-1.linux2.6.x86_64.rpm

now, a script that used to connect to another server says:

perl: symbol lookup error: /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/auto/DBD/mysql/mysql.so: undefined symbol: mysql_init

the script:

use DBI;

$dsn="db";
$host="my.host.ip";
$user="anonymous"; 
$password="";
# Connect to the database.
 $dbh= DBI->connect("DBI:mysql:host=$host;database=$dsn",$user, $password,{'RaiseError' => 1});

So, I've reinstalled DBI-1.616 and DBD-mysql-4.019 from the sources. for DBD-mysql, Make test says:

$ make test
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/00base....................ok 1/6                                           
#   Failed test 'use DBD::mysql;'
#   in t/00base.t at line 21.
#     Tried to use 'DBD::mysql'.
#     Error:  Can't load '/usr/local/package/DBD-mysql-4.019/blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql: /usr/local/package/DBD-mysql-4.019/blib/arch/auto/DBD/mysql/mysql.so: undefined symbol: mysql_get_server_version at /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DynaLoader.pm line 230.
#  at (eval 6) line 2
# Compilation failed in require at (eval 6) line 2.
# BEGIN failed--compilation aborted at t/00base.t line 21.
t/00base....................NOK 2FAILED--Further testing stopped: Unable to load DBD::mysql
make: *** [test_dynamic] Error 9

How can I fix this problem ?

Thanks !

Pierre

Asked: 2010-06-17 02:04:15 +0800 CST

Server crashes when too much memory is allocated

2

my server crashes whenever one of my users is running a 'R' script (this script requires a large amount of memory). Below is the last top I saw:

top - 11:32:39 up 20 min,  4 users,  load average: 1.08, 0.85, 0.46
Tasks: 336 total,   2 running, 334 sleeping,   0 stopped,   0 zombie
Cpu(s):  6.1%us,  0.2%sy,  0.0%ni, 93.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  65939968k total,  5131440k used, 60808528k free,    88256k buffers
Swap: 68124664k total,        0k used, 68124664k free,  1077612k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+ COMMAND
10392 cdina     25   0 3702m 3.5g 2428 R 100.0  5.6   7:51.82 R
10430 root      15   0 12872 1272  804 R  0.7  0.0   0:02.42 top
    1 root      15   0 10348  704  592 S  0.0  0.0   0:02.95 init
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 migration/0

is there a way to prevent my server from crashing ("don't run that script" is not an option :-) ) ? something like fixing a 'quota' for the memory allowed ?

(update)architecture:

uname -a
Linux myserver 2.6.18-194.3.1.el5 #1 SMP Sun May 2 04:17:42 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
#R was compiled on the server. just a simple configure/make/install
R --version
R version 2.11.0 (2010-04-22)
file /usr/local/lib64/R/bin/exec/R
R: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped

Pierre

Asked: 2010-05-27 07:08:29 +0800 CST

mysql UDF : fopen = permission denied

0

this is question I already asked on SO but I wonder if this could be a SysAdmin problem.

I'm trying to create a mysql UDF function , this function calls "fopen/fclose" to read a flat file stored in /data. But using errno (yes, I know it is bad in a MT program...) I can see that the function cannot open my file:

"Permission denied"

I tried to do a

chmod -R 755 /data (as well as 777, chown -R mysql:mysql /data etc...)

but it didn't change anything.

when I copied the flat file to /tmp : OK, my UDF was able to 'fopen' the file. I'm puzzled.

currently , I've got:

drwxrwxrwx 4 pierre root 4096 2010-05-26 16:51 /data
drwxrwxrwx 3 pierre root 4096 2010-05-18 09:41 /data/dir1
drwxrwxrwx 3 pierre root 4096 2010-05-18 09:41 /data/dir1/dir2
drwxrwxrwx 4 pierre root 4096 2010-05-18 10:27 /data/dir1/dir2/dir3
-rw-r--r-- 1 pierre root 50685268 2005-12-10 00:01 /data/dir1/dir2/dir3/myfile.txt

Any idea ?

Pierre

Asked: 2010-04-29 04:12:32 +0800 CST

Setting up a Git server

2

My team is working with several RedHat Linux servers and we'd like to synchronize our sources from one server to another (for several distinct projects).

I'd like to set-up a git-server as a version control; however I'm new to git and I'm confused by the terms ('server', "daemon', 'repository', etc...). Moreover we're working behind a firewall.

Can anyone point me to a link about how to setup a git server?

Thanks,
Pierre

Update: best resource I found was http://blog.commonthread.com/2008/4/14/setting-up-a-git-server but , for example how can I "use ssh keys to login so that you can have multiple developers connect securely and easily"

Pierre

Asked: 2010-04-03 05:27:26 +0800 CST

ubuntu/apt-get update said "Failed to Fetch http:// .... 404 not found"

1

I'm trying to run apt-get update on ubuntu 9.10

I've configured my proxy server and I can access the internet without any problem:

/etc/apt# wget "http://www.google.com"
Resolving (...)
Proxy request sent, awaiting response... 200 OK
Length: 292 [text/html]
Saving to: `index.html'
100%[=================================================================================================================================>] 292         --.-K/s   in 0s      

2010-04-02 17:20:33 (29.8 MB/s) - `index.html' saved [292/292]

But when I tried to use apt-get I got the following message:

Ign http://archive.ubuntu.com karmic Release.gpg
Ign http://ubuntu.univ-nantes.fr karmic Release.gpg       
Ign http://ubuntu.univ-nantes.fr karmic/main Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic/restricted Translation-en_US
Ign http://archive.ubuntu.com karmic Release   
Ign http://ubuntu.univ-nantes.fr karmic/multiverse Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic/universe Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-updates Release.gpg
Ign http://archive.ubuntu.com karmic/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/main Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-updates/restricted Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-updates/multiverse Translation-en_US
Ign http://archive.ubuntu.com karmic/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/universe Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-security Release.gpg
Ign http://archive.ubuntu.com karmic/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/main Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-security/restricted Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic-security/multiverse Translation-en_US
Ign http://archive.ubuntu.com karmic/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/universe Translation-en_US
Ign http://ubuntu.univ-nantes.fr karmic Release
Err http://archive.ubuntu.com karmic/main Sources
  404  Not Found
Ign http://ubuntu.univ-nantes.fr karmic-updates Release
Ign http://ubuntu.univ-nantes.fr karmic-security Release
Err http://archive.ubuntu.com karmic/restricted Sources
  404  Not Found
Ign http://ubuntu.univ-nantes.fr karmic/main Packages
Ign http://ubuntu.univ-nantes.fr karmic/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic/main Sources
Ign http://ubuntu.univ-nantes.fr karmic/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic/universe Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/main Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/universe Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/main Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/universe Packages
Ign http://ubuntu.univ-nantes.fr karmic/main Packages
Ign http://ubuntu.univ-nantes.fr karmic/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic/main Sources
Ign http://ubuntu.univ-nantes.fr karmic/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic/universe Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/main Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic-updates/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic-updates/universe Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/main Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/restricted Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/multiverse Packages
Ign http://ubuntu.univ-nantes.fr karmic-security/restricted Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/main Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/universe Sources
Ign http://ubuntu.univ-nantes.fr karmic-security/universe Packages
Err http://ubuntu.univ-nantes.fr karmic/main Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/restricted Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/multiverse Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/restricted Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/main Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/universe Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic/universe Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/main Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/restricted Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/multiverse Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/restricted Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/main Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/universe Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-updates/universe Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/main Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/restricted Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/multiverse Packages
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/restricted Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/main Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/universe Sources
  404  Not Found
Err http://ubuntu.univ-nantes.fr karmic-security/universe Packages
  404  Not Found
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/karmic/main/source/Sources.gz  404  Not Found

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/karmic/restricted/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/main/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/restricted/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/multiverse/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/restricted/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/main/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/universe/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic/universe/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/main/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/restricted/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/multiverse/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/restricted/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/main/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/universe/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-updates/universe/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/main/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/restricted/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/multiverse/binary-i386/Packages.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/restricted/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/main/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/universe/source/Sources.gz  404  Not Found

W: Failed to fetch http://ubuntu.univ-nantes.fr/ubuntu/dists/karmic-security/universe/binary-i386/Packages.gz  404  Not Found

apt.conf

However I can 'see' those files with firefox.

more /etc/apt/apt.conf
Acquire::http::proxy "http://www.myproxyname.fr:3128";

I also tried with port '80', or with a blank /etc/apt/apt.conf

source.list

grep -v "#" /etc/apt/sources.list

deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic main restricted multiverse
deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic-updates main restricted multiverse
deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic universe
deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic-updates universe
deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic-security main restricted multiverse
deb http://ubuntu.univ-nantes.fr/ubuntu/ karmic-security universe

does anyone knows how to fix this ?

Thanks

Pierre

Asked: 2010-03-17 08:22:24 +0800 CST

configuring a Fibre Channel switch

0

(I'm asking this for a friend and I'm don't know most of this technical stuff, so I'm sorry in advance if I'm not clear enough to describe the problem)

Where can i find any information about how to configure a Fibre Channel switch ( QLocic , Mini GBic, QME2572 ) to make it communicate with a Dell R905 and a Dell M905 Blade Server ?

Many thanks in advance

Pierre

Asked: 2010-01-29 07:59:28 +0800 CST

Linux CLI command for ~"what is this machine"?

6

is there a standard command for Linux that would provide a description of the server? (Things like model, number of cores, speed...)

Pierre

Asked: 2010-01-19 01:42:51 +0800 CST

Starting a mysql server in my ${HOME}?

5

I'm not root on my server (linux) and this server doesn't currently run a mysql server as a daemon.

Can I start a mysql daemon that would only work for my account and where the data/files would be stored somewhere in my ${HOME}/... ? How can it be done ?

Thanks, Pierre

Pierre

Asked: 2009-10-22 06:21:19 +0800 CST

Cannot download some files from a given server

1

I'm working on a Fedora Core release 6, and whenever I want to download a given file from a FTP site, the connection is refused:

  $ curl --ftp-pasv  "ftp://ftp.ensembl.org/pub/current_mysql/vega_mart_56/CHECKSUMS.gz" 
  curl: (7) couldn't connect to host
  $ wget "ftp://ftp.ensembl.org/pub/current_mysql/vega_mart_56/CHECKSUMS.gz"
  --14:25:46--  ftp://ftp.ensembl.org/pub/current_mysql/vega_mart_56/CHECKSUMS.gz
             => `CHECKSUMS.gz'
  Resolving ftp.ensembl.org... 193.62.203.113
  Connecting to ftp.ensembl.org|193.62.203.113|:21... failed: Connection refused.

Downloading from a HTTP server is OK.

is it a firewall problem ? How can I fix this ? (The sysadmin is in holidays... :-) )

Thanks

Tracking the linux config with git: how?

Apache2/glassfish|tomcat: Redirecting some (but not all) requests on 80 to glassfish on port 8080, where is the admin screen?

Is it safe to publicly tell the IP of my proxy?

chown: changing ownership of `.': Invalid argument

PERL+mysql: undefined symbol: mysql_init

Server crashes when too much memory is allocated

mysql UDF : fopen = permission denied

Setting up a Git server

ubuntu/apt-get update said "Failed to Fetch http:// .... 404 not found"

configuring a Fibre Channel switch

Linux CLI command for ~"what is this machine"?

Starting a mysql server in my ${HOME}?

Cannot download some files from a given server

Can you pass user/pass for HTTP Basic Authentication in URL parameters?

Ping a Specific Port

Check if port is open or closed on a Linux server?

How to automate SSH login with password?

How do I tell Git for Windows where to find my private RSA key?

What's the default superuser username/password for postgres after a new install?

What port does SFTP use?

Command line to list users in a Windows Active Directory group?

What is a Pem file and how does it differ from other OpenSSL Generated Key File Formats?

How to determine if a bash variable is empty?