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deck.json
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"__type__": "Note",
"data": "",
"fields": [
"Which commands lists all locale categories?",
"<i>locale</i>"
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"fields": [
"Create an ssh tunnel between the local system, port 1111 and host <i>endhost</i>, port 80, via host <i>middlehost</i>",
"<i>ssh middlehost -L 1111:endhost:80</i><div><br></div><div>from another shell then</div><div><i>curl -Lk localhost:1111</i></div>"
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{
"__type__": "Note",
"data": "",
"fields": [
"How to make <i>journalctl</i> behave like <i>tail -f /var/log/syslog</i>?",
"<i>journalctl -f</i>"
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Which field in <i>/etc/passwd</i> contains information about the user?",
"The GECOS field (5.)"
],
"flags": 0,
"guid": "6u1?n&n8,",
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{
"__type__": "Note",
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"fields": [
"Which file does <i>ssh-add </i>add to the SSH agent if no argument was passed to ssh-add?",
"~/.ssh/id_<type>, e. g. ~/.ssh/id_rsa"
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"__type__": "Note",
"data": "",
"fields": [
"Why had TCP/IP to be developed?",
"To support the increasing load in ARPANET."
],
"flags": 0,
"guid": "7Og1|S`e7",
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"109.1",
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{
"__type__": "Note",
"data": "",
"fields": [
"Create a comma separated, 0-padded list of numbers from 1 to 10",
"seq -s, -w 1 10"
],
"flags": 0,
"guid": "A4jq!Aysh=",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Name 2 desktop environments with their display manager and window manager",
"- KDE with KDM and KWin<div>- Gnome with GDM and Metacity (earlier: Sawfish)</div>"
],
"flags": 0,
"guid": "A>Jm9Gj=EP",
"newlyAdded": false,
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"106.1",
"weight2"
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"__type__": "Note",
"data": "",
"fields": [
"How to see journal messages of the SSH daemon only?",
"<i>journalctl -u sshd</i>"
],
"flags": 0,
"guid": "AA~iNXFuI?",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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{
"__type__": "Note",
"data": "",
"fields": [
"What does BIND stand for?",
"Berkeley Internet Name Daemon"
],
"flags": 0,
"guid": "AEa[0oEMj0",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What is ksh?",
"the combination of sh and csh"
],
"flags": 0,
"guid": "AWt]%F@Q|z",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"In which file should <i>ulimit</i>s be set?",
"in <i>/etc/profile</i>"
],
"flags": 0,
"guid": "AZnJMw_6vJ",
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{
"__type__": "Note",
"data": "",
"fields": [
"How many sections does <i>xorg.conf</i> need to configure one monitor?",
"<div>two</div>- section Monitor<div>- section Modes</div><div><br></div><div>or one, if the \"ModeLine\" lines are included in the \"Monitor\" section</div>"
],
"flags": 0,
"guid": "A]]LXID_4i",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Where does gnupg store information about trusted keys of other users?",
"<i>~/.gnupg/trustdb.gpg</i>"
],
"flags": 0,
"guid": "AjXvG|r]Kg",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Name 2 types of command substitution",
"-backticks: return=`ls -al`<div>-dollar sign: return=$(ls -al)</div>"
],
"flags": 0,
"guid": "A{$5+,ZVZ7",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"How to display the number of parameters with which a script was called?",
"echo $#"
],
"flags": 0,
"guid": "B(:F;]t.t",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What does a <i>!</i> stand for in the second column in <i>/etc/shadow</i>?",
"This user cannot login with a Unix password."
],
"flags": 0,
"guid": "B)^BF-hO3E",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What is the main responsibility of a display manager?",
"User authentication"
],
"flags": 0,
"guid": "B.T;=mHWRP",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
"tags": [
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"106.1",
"weight2"
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},
{
"__type__": "Note",
"data": "",
"fields": [
"When will /etc/profile be read?",
"First after logging in."
],
"flags": 0,
"guid": "B1f1[:0#t]",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"How to set the system's timezone using systemd?",
"<i>timedatectl set-timezone Europe/Berlin</i>"
],
"flags": 0,
"guid": "BE&yu$|H>m",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
"tags": [
"107",
"107.3",
"weight3"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Which are the fields in <i>/etc/gshadow</i>?",
"- Group name<div>- Group password</div><div>- Group administrator</div><div>- Group members</div>"
],
"flags": 0,
"guid": "BH3u[X9`bG",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"107.1",
"weight5"
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What does <i>shift</i> do?",
"It shifts the parameters so that $2 will be $1, $3 will be $2, and so on."
],
"flags": 0,
"guid": "BIGDV{s1C=",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
"tags": [
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Rename group <i>presidents</i> to <i>donalds</i>",
"<i>groupmod -n donalds presidents</i>"
],
"flags": 0,
"guid": "BK{q^dTV?j",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Which devices are configured in section \"InputDevice\" in <i>xorg.conf</i>?",
"- keyboard<div>- mouse</div>"
],
"flags": 0,
"guid": "BO8=m[bi<H",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Will unexported shell variables be available to a shell script with shebang?",
"No."
],
"flags": 0,
"guid": "BRyy=Ehd_r",
"newlyAdded": false,
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{
"__type__": "Note",
"data": "",
"fields": [
"Which variables will be inherited to subshells?",
"environment variables"
],
"flags": 0,
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{
"__type__": "Note",
"data": "",
"fields": [
"What does KDE stand for?",
"Kool Desktop Environment"
],
"flags": 0,
"guid": "BggX;s#<j4",
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"weight1"
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What is the process of <i>logrotate</i>?",
"first iteration: the original logfile is moved to <i>logfile.1</i><div>next iteration: <i>logfile.1</i> is moved to <i>logfile.2.gz</i>, the original logfile is moved to <i>logfile.1</i></div>"
],
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"108",
"108.2",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Encrypt the file <i>verysecret.txt</i>",
"<i>gpg --encrypt verysecret.txt</i>"
],
"flags": 0,
"guid": "ByRo*ngHgC",
"newlyAdded": false,
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"110.3",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Which variable will override all other LCs if set on command line or in a script?",
"LANG"
],
"flags": 0,
"guid": "C%8T|ze;-Z",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"Schedule a one-time job, running in 30 minutes [2]",
"<i>- at now +30min /bin/touch /home/user/test</i><div><i>- systemd-run --on-active=30min /bin/touch /home/user/test</i></div>"
],
"flags": 0,
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},
{
"__type__": "Note",
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"fields": [
"Line from <i>/etc/shadow</i>:<div><br></div><div><i>username:$11$54$...fd:14:1:21:1:2:::</i></div><div><br></div><div>The user must change the password every... days.</div>",
"21 (5th column)"
],
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"weight5"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Add user <i>watson</i> to group <i>detectives</i>",
"<i>usermod -G detectives watson</i>"
],
"flags": 0,
"guid": "CG?.InfV;:",
"newlyAdded": false,
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"weight5"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"What is the difference between <i>host</i> and <i>dig</i> in terms of name servers?",
"<i>host </i>uses the name servers from <i>/etc/resolv.conf</i>, <i>dig</i> accepts the name server as an argument"
],
"flags": 0,
"guid": "CLr/FndYfr",
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"109",
"109.4",
"weight2"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Which variables will be inherited?",
"environment variables"
],
"flags": 0,
"guid": "CNvzt/6+4g",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"How to test whether a file exists and has the SGID bit set?",
"test -g <filename>"
],
"flags": 0,
"guid": "CTtA(H-=6E",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"What is /etc/skel?",
"A template for a user's home directory"
],
"flags": 0,
"guid": "CV+Vj/d{`p",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What does <i>||</i> between two commands do?",
"The first command will be run, the second one only if the first command failed."
],
"flags": 0,
"guid": "C_C6(E=idO",
"newlyAdded": false,
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Name 3 tools to actually reconfigure the system time and date",
"- <i>tzconfig</i><div><i>- dpkg-reconfigure tzdata</i> (Debian et. al.)</div><div><i>- timedatectl</i> (systemd)</div>"
],
"flags": 0,
"guid": "C_wdH:]o.S",
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"107",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"When will this crontab line be executed?<div><i>0 8,10,13,16 * * 1-5 /etc/myscripts/virusscan</i><br></div>",
"8:00, 10:00, 13:00 and 16:00 Monday to Friday"
],
"flags": 0,
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Name 3 escape sequences for echo -e",
"-\\\\ backslash<div>-\\a alert</div><div>-\\b backspace</div><div>-\\c suppress new line character</div><div>-\\f form feed / new page</div><div>-\\n new line</div><div>-\\r carriage return</div><div>-\\t horizontal tabulator (8 spaces)</div><div>-\\v vertical tabulator (8 empty lines)</div>"
],
"flags": 0,
"guid": "Cq+i8SXs(Z",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"In <i>/etc/sudoers</i>, how is a line for a user different from a line for a group?",
"Groups begin with a leading %<div>user1 ALL=(ALL) ALL</div><div>%group1 ALL=(ALL) ALL</div>"
],
"flags": 0,
"guid": "D&G,MU^QE)",
"newlyAdded": false,
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"110.1",
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What does TCP stand for?",
"Transmission Control Protocol"
],
"flags": 0,
"guid": "D&JB7U9=Lp",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"How to set a hostname on a remote computer using systemd?",
"<i>hostnamectl -H <hostname> set-hostname <newhostname></i>"
],
"flags": 0,
"guid": "D(dcc[R?5j",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"109",
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"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"How to configure a range in a systemd timer?",
"..<div>e. g. <i>Mon *-*-1..7 19:00:00</i></div>"
],
"flags": 0,
"guid": "D*K,1U2sH+",
"newlyAdded": false,
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"107",
"107.2",
"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"What is the name of the tool which stores passphrases for gnupg?",
"<i>gpg-agent</i>"
],
"flags": 0,
"guid": "D,eUlK^tO>",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"110",
"110.3",
"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Convert <i>input.txt (UTF-8)</i> to <i>output.txt (ISO 8859-1)</i> ",
"<i>iconv -f UTF-8 -t ISO-8859-1 input.txt -o output.txt</i>"
],
"flags": 0,
"guid": "D--LuYh.$I",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"weight3"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"What is the difference between <i>arp -a</i> and <i>ip neighbour show</i>?",
"<i>ip neighbour show</i> also shows IPv6 addresses"
],
"flags": 0,
"guid": "D0Do9%Q;H%",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Create a port listener with <i>netcat</i> on port 8765",
"<i>netcat -p 8765 -l</i>"
],
"flags": 0,
"guid": "D0[~5#kt9z",
"newlyAdded": false,
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"109",
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"weight4"
]
},
{
"__type__": "Note",
"data": "",
"fields": [
"Why is no DNS server needed in smaller IPv6 networks?",
"Because the address part of the IPv6 address will be calculated from the MAC address"
],
"flags": 0,
"guid": "DE^AvQ19ms",
"newlyAdded": false,
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},
{
"__type__": "Note",
"data": "",
"fields": [
"What does <i>&&</i> between two commands do?",
"The first command will be run, the second one only if the first one succeeded."
],
"flags": 0,
"guid": "DH@:Yz<@ns",
"newlyAdded": false,
"note_model_uuid": "353a446a-7cec-11ea-8807-d2001e897120",
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]
},
{
"__type__": "Note",
"data": "",
"fields": [
"What does a * in the second column in <i>/etc/shadow</i> stand for?",
"This user cannot login with a Unix password."
],
"flags": 0,
"guid": "DUUd(X%}kV",
"newlyAdded": false,
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