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• Bash
  ...ls capable of this are [[Korn Shell]] (1993 version) and [[zsh]] (starting at version 4.0). ...h can redirect [[standard output]] and [[Standard streams|standard error]] at the same time using this syntax:
  34 KB (5,354 words) - 19:04, 9 May 2023
• Awk
  ;<code>BEGIN { ''action'' }</code>: Executes ''action'' commands at the beginning of the script execution, i.e., before any of the lines are pr ;<code>substr(s,p,n)</code>: returns substring of string s at beginning position p up to a maximum length of n. If n is not supplied, the
  11 KB (1,785 words) - 21:29, 30 May 2022
• Christoph Champ
  My love of [[:Category:Books|books]] runs deep. I try to read for at least an hour every day (books unrelated to my studies).
  6 KB (939 words) - 06:58, 19 April 2022
• Curriculum Vitae
  *'''March 2022 &ndash; present''': DevOps Architect at '''Redapt''', Seattle, USA. *'''March 2020 &ndash; March 2022''': Cloud Solution Architect at '''Redapt''', Seattle, USA.
  39 KB (5,009 words) - 19:43, 14 January 2023
• Vi
  <tr class="data" ><td class="code">I</td> <td>insert at start of line</td></tr> *Set mark <code>{a-zA-Z}</code> at cursor position (does not move the cursor, this is not a motion command):
  14 KB (2,396 words) - 22:38, 21 June 2023
• Personal records
  ...climbed: [[wikipedia:Imbabura_Volcano|Imbabura volcano, Ecuador]] in 1993; at '''4,620 m''' (0°26′N 78°18′W) (see [[:Category:Mountain climbing|Mou ** Second highest mountain: Mauna Loa in 2017 at 4,169 m
  4 KB (522 words) - 10:04, 15 December 2021
• The True Believer: Thoughts on the Nature of Mass Movements
  ...gues that the relatively low number of mass movements in the United States at that time was attributable to a culture that blurred traditionally rigid bo ...vigor only so long as it can offer nothing in the present.... The movement at this stage still concerns itself with the frustrated—not to harness their
  17 KB (2,644 words) - 23:41, 30 October 2020
• AWS/DevOps
  ; All-at-Once Deployment (build -> x2 targets) ...ment process is rapid - entire environemnt (blue or green) is deployed all at once.
  28 KB (3,792 words) - 17:56, 26 February 2021
• Python
  nums[3::] #equals [7, 8, 13, 20] (starting at index 3 going to the end) nums[::3] #equals [1, 7, 20] (starting at index 0 and getting every third element afterward)
  11 KB (1,639 words) - 21:59, 9 September 2022
• MySQL
  .../tt>"), current host ("<tt>\h</tt>"), and current database ("<tt>\d</tt>") at the MySQL prompt. ...way to automatically backup your entire MySQL database(s) (say, once a day at 02h30) is to create a [[crontab|cron job]] like so:
  15 KB (2,259 words) - 00:21, 10 February 2021
• Job control
  ...(suspend) the execution of processes and continue (resume) their execution at a later point. A user typically employs this facility via an interactive in ...t status of a process terminated by a signal. The return status is zero if at least one signal was successfully sent, or non-zero if an error occurs or a
  13 KB (2,288 words) - 04:42, 21 April 2023
• Citizen of the World
  ...association or concept". I am multicultural, a [[Third Culture Kid]], and at-home in almost any setting in just about any country.
  1,021 bytes (182 words) - 08:17, 16 November 2017
• Christoph Champ Logo
  <!--:<math>x=A\sin(at+\delta),\quad y=B\sin(bt),</math>--> :''x'' = ''A''*sin(''at'' + &delta;), ''y'' = ''B''*sin(''bt''),
  1 KB (206 words) - 12:54, 24 December 2019
• Curl
  * Get the README file the user's home directory at funet's ftp-server: * Fetch two documents at once:
  10 KB (1,538 words) - 04:37, 21 April 2023
• Summary of "The Dead" by James Joyce
  ...which traces the course of a single evening sometime in the winter of 1904 at a party in the home of the sisters Kate and Julia Morkan and their niece Ma ...a turn entertaining the guests, telling a joke or a story or sitting down at the piano. The richness in this, the feeling one gets of a tightly knit fam
  5 KB (826 words) - 08:21, 18 November 2021
• Miscellaneous commands
  ...esponsibility'' on my part if they cause loss of information or files. Use at your own risk. *The following commands will print (to an actual printer) a file, starting at page 4, with a header of "ERRORS", with a line length of 80 characters, and
  20 KB (3,106 words) - 23:38, 10 September 2021
• Summary of "Metamorphosis" by Franz Kafka
  ...with) he chose an insect. An insect is a creature most people hate, cringe at, or are afraid of. If Gregor had turned into a horse, for example, his fami
  2 KB (290 words) - 08:16, 18 November 2021
• Philosophy 150
  ...ent for straying too far from the fold. Likewise, any relationship between at least two individuals has its requirements for the continuance of a harmoni ...individual, a daughter, a member of society, and with friends. She has had at least elements of a religious upbringing. She is able to function in societ
  6 KB (1,075 words) - 08:22, 18 November 2021
• SmoothDock
  ...potentials. ''Proteins''.</ref> developed by Camacho and Steven R. Comeau at Boston University (note: ''ClusPro'' is also based on a previous algorithm, ...from the matrix to avoid overlaps between clusters. This is repeated until at least 30 clusters are formed. The ligand with the most neighbours is the cl
  10 KB (1,409 words) - 22:27, 15 March 2018
• Summer Reading List
  ...''very'' long time to complete this list, however, I am taking it one book at a time.
  15 KB (2,080 words) - 12:26, 23 December 2018
• Sed/scripts
  ...each line of a file (simple left alignment). Using a tab (see note on '\t' at end of file) instead of space will preserve margins. sed '{{Regex/Replace|^[ \t]*|||}}' # see note on '\t' at end of file
  30 KB (4,929 words) - 22:47, 21 August 2019
• Dd (command)
  ; '''ibs'''=''bytes'' : Input Block Size: Read ''bytes'' bytes at once. ; '''obs'''=''bytes'' : Output Block Size: Write ''bytes'' bytes at once.
  10 KB (1,656 words) - 01:46, 7 May 2018
• Awk/scripts
  *Select lines where the second field is at least 100 greater than the first field: ...of <code>s</code> that begins at position <code>m</code> (origin 1) and is at most <code>n</code> characters long. If <code>n</code> is omitted, the subs
  18 KB (2,772 words) - 22:57, 26 October 2021
• Iptables
  *Delete a rule at some position in a chain (<code>-D, --delete chain rule-specification</code *[http://snafu.priv.at/mystuff/recent-plus-pam.html pam_recent: an add-on to make iptables' recent
  21 KB (2,869 words) - 21:16, 19 December 2018
• Crontab
  @reboot Run once, at startup # summary prepared at 18:05 every weekday.
  8 KB (1,304 words) - 08:49, 18 September 2021
• GenBank
  ...ic Acids Research, 34(Database):D16-D20''.</ref> This database is produced at ''National Center for Biotechnology Information'' (NCBI). For details please refer to the NCBI genome FTP site at: ftp://ftp.ncbi.nih.gov/genomes/ and the [http://www.ncbi.nlm.nih.gov/genom
  9 KB (1,070 words) - 18:10, 1 April 2020
• Bioinformatics databases links
  :Name : 2-DE database at Universidad Complutense de Madrid :Name : 2-DE gel protein databases at Harefield
  38 KB (4,993 words) - 18:29, 2 April 2017
• Nmap
  *Make Nmap choose 100,000 hosts at random and scan them for web servers (port 80). Host enumeration is disable
  6 KB (882 words) - 00:04, 6 June 2021
• Msec
  All the changes are logged to syslog(8) at the AUTH facility when called non interactivelly (by cron for example) or at the LOCAL1 facil‐
  2 KB (254 words) - 21:30, 25 March 2016
• Git
  ...org/wiki/Git Git] and [http://www.linux-mips.org/wiki/WhatIsGit WhatIsGit] at [http://www.linux-mips.org LinuxMIPS] wiki
  4 KB (633 words) - 00:38, 19 February 2021
• Python/NumPy
  section = a[10:20, 30:40] # 10x10 subblock starting at [10,30] The admission fee at a small fair is $1.50 for children and $4.00 for adults. On a certain day,
  10 KB (1,665 words) - 23:53, 30 March 2017
• Tr (coreutils)
  ...y have the same length. If set1 is shorter than set2, the extra characters at the end of set2 are ignored. ...' rather than the three. One way to solve the problem is to put the hyphen at the end of the list of characters:
  11 KB (1,812 words) - 07:26, 1 July 2020
• Rackspace API
  The token in the previous command is usually found at the beginning of the output and looks something like this: <code>{"access": ...ntre this container is stored in (i.e., the "<code>dfw1</code>" characters at the end of that string). Of course, you already knew that, as you told it w
  38 KB (4,754 words) - 17:30, 19 September 2019
• Netsed
  ...ers, content filtering, protocol conversion - whatever best fits your task at hand.
  2 KB (302 words) - 22:39, 12 June 2019
• CentOS
  Enable the service at boot-time:
  6 KB (850 words) - 00:00, 27 August 2016
• Linux log files
  :Contains the logging from the kernels initialization at system bootup, as well as any kernel errors or informational messages that
  5 KB (718 words) - 00:58, 12 December 2018
• Ansible
  Note: The default inventory file lives at <code>/etc/ansible/hosts</code>. However, since I will be storing this file
  12 KB (1,304 words) - 17:04, 10 April 2022
• Systemd
  -- Logs begin at Fri 2018-07-13 11:54:18 PDT, end at Tue 2021-08-17 14:20:37 PDT. --
  12 KB (1,578 words) - 00:06, 11 April 2023
• Rackspace API/Cloud Images
  ...o use or see this image on their account, they can simply reject the image at any point (see last command).
  6 KB (870 words) - 17:29, 19 September 2019
• Strace
  ...Linux Systems Administrator. [[Christoph Champ|I]] use it on a daily basis at work.
  6 KB (855 words) - 21:12, 18 February 2016
• OpenStack deployment via packstack from RDO
  * Look at the Network Address Translation (NAT) rules within the network namespace:
  18 KB (2,225 words) - 21:41, 8 April 2016
• Cowsay
  ...with no arguments, it accepts standard input, word-wraps the message given at about 40 columns, and prints the cow saying the given message on standard o
  510 bytes (79 words) - 00:54, 19 February 2016
• AWS/EC2
  ...re Amazon EC2 computing capacity. Since Spot instances are often available at a discount compared to On-Demand pricing, you can significantly reduce the ...applications that have flexible start and end times and are only feasible at very low compute prices.
  16 KB (2,382 words) - 16:29, 7 April 2017
• Docker
  ; Containers : Containers are an abstraction at the app layer that packages code and dependencies together. Multiple contai At the beginning, the status of container is <code>(health: starting)</code>;
  48 KB (6,756 words) - 21:40, 3 March 2023
• Rancher
  At the top of the <code>3-node-certificate.yml</code> file, configure your nod ==Encryption at rest==
  41 KB (5,236 words) - 22:30, 20 August 2020
• Kubernetes
  ...nning Pods (e.g., for scaling or ensuring that at least one Pod is running at all times, etc.). It is considered a "best practice" to use RCs to define P ...nager. It makes sure the specified number of replicas for a Pod is running at any given point in time. If there are more Pods than the desired count, the
  168 KB (22,699 words) - 17:26, 19 January 2024
• Terraform
  * Upgrade modules and plugins at initialization: ...mbers (however, you can get conflicts when two or more people make changes at the same time)
  63 KB (8,361 words) - 23:51, 19 July 2022
• DevOps
  ...ating the process of software delivery and infrastructure changes. It aims at establishing a culture and environment, where building, testing, and releas
  8 KB (1,112 words) - 18:34, 4 February 2021
• AWS/S3
  ** At Rest: *** Data at rest
  16 KB (2,466 words) - 18:15, 7 April 2017
• OpenStack Ironic
  ...c is configured via its configuration file. This file is typically located at <code>/etc/ironic/ironic.conf</code>: ...e /tftpboot. Copy the PXE image to /tftpboot. The PXE image might be found at [1]:
  12 KB (1,697 words) - 20:43, 8 February 2017
• Google Cloud Platform
  ** Organization Owners are established at creation (note: always have more than one organization owner, for security ** Applied at Project-level
  100 KB (12,852 words) - 00:23, 27 July 2021
• Big Data
  * Data stores are at the core of the Big Data infrastructure and need to be fast, scalable, and * Developed at Yahoo and open-sourced to Apache.
  53 KB (7,890 words) - 19:21, 23 March 2017
• AWS/Machine Learning
  However, we are going to leave it at 0.5, as that provides the best quality score (or AUC). * [http://archive.ics.uci.edu/ml/datasets.html University of California at Irvine (UCI) Machine Learning Repository]
  25 KB (3,055 words) - 16:50, 20 March 2017
• Apache Spark
  ...ark''' is an open-source cluster-computing framework. Originally developed at the University of California, Berkeley's AMPLab, the Spark codebase was lat * Originated as a research project in 2009 at [https://amplab.cs.berkeley.edu/ UC Berkeley AMPLab].
  47 KB (6,681 words) - 18:29, 27 November 2019
• Python/matplotlib
  * A(i,j) represents the pixel intensity at coordinate (i,j)
  2 KB (391 words) - 23:53, 30 March 2017
• Python/SciPy
  norm.pdf(r) # calculate the PDF of all values r at the same time
  3 KB (458 words) - 23:53, 30 March 2017
• The Story of Civilization
  ...of Indian philosophy; The Chinese or Japanese sage will smile indulgently at these brief and inadequate selections from the wealth of Far Eastern litera ##Rome at Work: AD 14–96
  21 KB (2,887 words) - 19:44, 10 March 2018
• Raspberry Pi
  ...properly connected and it is set to its default address it should show up at <code>0x62</code>.
  9 KB (1,204 words) - 22:57, 24 September 2022
• Tcpkali
  # --latency-percentiles <list> Report latency at specified percentiles
  3 KB (352 words) - 00:04, 14 May 2019
• Kubernetes/the-hard-way
  ...etadata will be used to expose pod subnet allocations to compute instances at runtime. ...rnetes.io/docs/tasks/administer-cluster/encrypt-data encrypt] cluster data at rest.
  71 KB (8,566 words) - 23:27, 9 August 2019
• Helm
  *<tt>verify</tt> &mdash; verify that a chart at the given path has been signed and is valid
  7 KB (787 words) - 19:00, 11 April 2022
• Kubernetes/GKE
  ...CronJobs to perform finite, time-related tasks that run once or repeatedly at a time that you specify. ...Combining <code>/</code> with ranges specifies that the task should repeat at a regular interval. In the example, <code>*/1 * * * *</code> indicates that
  140 KB (19,601 words) - 06:57, 9 September 2021
• Istio
  ...019. Istio is being refactored and some of the following will have changed at some point in the future.</div> * Set Istio to <code>NodePort</code> at port 30080:
  11 KB (1,410 words) - 21:29, 16 August 2021
• Moreutils
  *<code>parallel</code>: run multiple jobs at once
  1 KB (183 words) - 02:42, 16 March 2020
• Vault
  * Enable <code>kv-v2</code> secrets at the path internal: Success! Enabled the kv-v2 secrets engine at: internal/
  18 KB (2,206 words) - 21:16, 15 April 2020
• OpenSSL
  ...over computer networks against eavesdropping or need to identify the party at the other end. It is widely used by Internet servers, including the majorit
  4 KB (594 words) - 23:29, 25 June 2020
• Here document
  ...ng a here document. This could be in a shell file or entered interactively at a prompt. ...ng their value. (Note that while tabs can typically be entered in editors, at the command line they are typically entered by <code>Ctrl-V + Tab</code> in
  7 KB (1,241 words) - 00:46, 29 June 2020
• LPIC
  ** Provide common commands to the boot loader and options to the kernel at boot time.
  6 KB (733 words) - 22:25, 30 April 2021
• Dig
  ; The stats section at the bottom displays few dig command statistics including how much time it t ...y the <code>ANSWER SECTION</code>: For the most part, all you need to look at is the <code>ANSWER SECTION</code> of the dig command. So, we can turn off
  17 KB (2,253 words) - 09:22, 21 September 2021
• Vagrant
  # Boxes are configured at 101, 102 and so on
  6 KB (769 words) - 21:10, 29 March 2022
• Pulumi
  Press ^C at any time to quit.
  12 KB (1,530 words) - 19:11, 1 October 2021
• Procfs
  ...btain information about the kernel and to change certain kernel parameters at runtime (sysctl). * depending on the mode of power management (if at all), either directory, <code>/proc/acpi</code> or <code>/proc/apm</code>>,
  10 KB (1,571 words) - 22:24, 20 January 2022