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Q483297
Inglês
Texto associado
Here’s the first line of code ever written by a US president
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
A explicação do Presidente Obama sobre os conceitos de programação e a percepção do autor do texto sobre essa explicação são, respectivamente:
Q483296
Inglês
Texto associado
Here’s the first line of code ever written by a US president
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
Enquanto programava, Obama observou e questionou, respectivamente, os seguintes aspectos:
Q483295
Inglês
Texto associado
Here’s the first line of code ever written by a US president
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
Barack Obama just became the first US president to write a line of computer code (assuming George W. Bush never secretly indulged in PHP). At the White House yesterday, Obama sat down with students who were learning the fundamentals of JavaScript, the popular programming language used to create most web pages.
The line he wrote was:
moveForward(100);
“So I make the F in higher case?” Obama asked, correctly observing that JavaScript is case sensitive. “Semicolon?” (That semicolon is optional, but Obama apparently has a knack for recognizing JavaScript best practices.)
Obama was playing with a Code.org tutorial based on the popular Disney movie Frozen. In his line of code, the President called a function-moveForward-pre-defined by Code.org for the exercise.
Calling a function in JavaScript is simple: write its name exactly as it has been defined, followed by parentheses that contain its “arguments.” In this case, a single argument tells the program how many pixels to move a Frozen character forward. Because it’s measured in pixels, the argument has to be a number. If Obama had written moveForward(“three steps”), the program would have failed, offering only a cryptic error message and exposing the president to the near-perpetual state of frustration most software developers live in.
“This is Elsa?” Obama asked, referring to the movie’s main character.
Obama was promoting Computer Science Education Week and Code.org’s Hour of Code campaign, which encourages kids to try programming for at least one hour. “It turns out the concepts are not that complicated,” Obama told the students at the White House, though his attempt to explain it suggested otherwise:
“The basic concept behind coding is that you take zeros and ones, you take two numbers, yes or no, and those can be translated into electrical messages that then run through the computer…. So all it’s doing is it’s saying yes or no over and over again, and the computer’s powerful enough that it can read a really long set of instructions really quickly.”
Something like that.
Disponível em: http://qz.com/308904/heres-the-first-line-of-code-ever-written-by-a-us-president/
Quartz (9 de Dezembro de 2014) - Texto de Zachary M. Seward
A atividade desempenhada pelo Presidente Obama na Casa Branca foi:
Q483294
Sistemas Operacionais
Em servidor Web, Apache, para melhorar o desempenho e a performance em que o servidor não precise verificar em cada diretório a existência de um arquivo .htaccess, a diretiva que podemos usar é:
Q483293
Sistemas Operacionais
No gerenciamento de processos, operações ligadas ao I/O aguardam que uma determinada operação de I/O seja finalizada, com isso o processo entra em um estado em que não pode ser morto, para que não haja inconsistências. Pode-se ainda identificá-lo através do comando top na coluna status.
Este estado é:
Este estado é:
Q483292
Redes de Computadores
No postfix, para melhor segurança, pode-se implementar o método de autenticação SMTP, o qual requer que clientes de e-mail enviem um nome de usuário e uma senha ao servidor SMTP durante o diálogo SMTP, e, se a autenticação foi bem-sucedida, eles poderão começar a retransmitir.
No arquivo de configuração que controla o daemon do postfix, o parâmetro que deve ser alterado para que o mecanismo de autenticação seja habilitado é:
No arquivo de configuração que controla o daemon do postfix, o parâmetro que deve ser alterado para que o mecanismo de autenticação seja habilitado é:
Q483291
Sistemas Operacionais
Observe o comando abaixo:
PowerEdge-2850:~$ ps l
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
0 1000 3870 3860 20 0 8568 3236 wait Ss pts/1 0:00 bash
0 1000 4024 3870 20 0 2272 556 wait S pts/1 0:00 sh
0 1000 4025 4024 20 0 8568 3232 wait S pts/1 0:00 bash
0 1000 4043 4025 20 0 6500 768 - R+ pts/1 0:00 ps l
PowerEdge-2850:~$
Considere as afirmativas sobre a saída do comando e assinale a opção que contém as corretas.
1) todos os processos estão sendo rodados por um mesmo usuário
2) um dos processos ocupa há mais tempo a CPU
3) os processos “bash” possuem processos pai diferentes
4) todos têm a mesma prioridade
5) todos os processos estão esperando execução de outros processo
PowerEdge-2850:~$ ps l
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
0 1000 3870 3860 20 0 8568 3236 wait Ss pts/1 0:00 bash
0 1000 4024 3870 20 0 2272 556 wait S pts/1 0:00 sh
0 1000 4025 4024 20 0 8568 3232 wait S pts/1 0:00 bash
0 1000 4043 4025 20 0 6500 768 - R+ pts/1 0:00 ps l
PowerEdge-2850:~$
Considere as afirmativas sobre a saída do comando e assinale a opção que contém as corretas.
1) todos os processos estão sendo rodados por um mesmo usuário
2) um dos processos ocupa há mais tempo a CPU
3) os processos “bash” possuem processos pai diferentes
4) todos têm a mesma prioridade
5) todos os processos estão esperando execução de outros processo
Q483290
Programação
O interpretador de comandos bash permite a verificação do status do encerramento do último comando ou função executado no script. Um exemplo de trecho de código fonte que verifica o valor desse status é:
Q483289
Redes de Computadores
Em um servidor Ldap, pode-se utilizar a porta padrão 389 para suportar sessões criptografadas e não criptografadas, dependendo da solicitação do cliente, através do seguinte mecanismo:
Q483288
Programação
Suponha que no diretório /home/uerj/teste existam os subdiretórios d1, d2, d3, d4 e d5 e que, em cada um deles, exista um arquivo com o nome a.txt. Deseja-se fazer um script que mova o arquivo a.txt desses subdiretórios para o diretório /home/uerj/teste. Como todos os arquivos possuem o mesmo nome, deve-se renomeá-lo e adicionar o número do diretório ao nome do arquivo. Por exemplo, o arquivo /home/uerj/teste/d1/a.txt será movido para /home/uerj/teste/a1.txt enquanto que o arquivo /home/uerj/teste/d3/a.txt será movido para /home/uerj/teste/a3.txt.
O código do script que realiza esse procedimento é:
O código do script que realiza esse procedimento é:
Q483287
Redes de Computadores
No servidor DNS, considerando os parâmetros do arquivo named.hosts do aplicativo Bind, a opção que não contém um registro de recurso é:
Q483286
Redes de Computadores
Em um Servidor de DNS, no seu arquivo de configuração de zona, o parâmetro que permite que o servidor secundário busque, de tempos em tempos, a comunicação com o servidor primário é:
Q483285
Sistemas Operacionais
Deseja-se modificar a permissão do arquivo /home/uerj/teste.txt para que:
• O dono do arquivo tenha permissão de leitura escrita e execução;
• O grupo ao qual pertence ao usuário tenha permissão de leitura e execução;
• Os demais usuários tenham apenas permissão de leitura.
O comando a ser usado é:
• O dono do arquivo tenha permissão de leitura escrita e execução;
• O grupo ao qual pertence ao usuário tenha permissão de leitura e execução;
• Os demais usuários tenham apenas permissão de leitura.
O comando a ser usado é:
Q483283
Segurança da Informação
Observe a estrutura abaixo:
wheel:*:10:root,evi,garth,trent
csstaff:*:100:lloyd,evi
student:*:200:dotty
De acordo com a estrutura do arquivo /etc/group, o conteúdo das colunas deve ser, respectivamente:
wheel:*:10:root,evi,garth,trent
csstaff:*:100:lloyd,evi
student:*:200:dotty
De acordo com a estrutura do arquivo /etc/group, o conteúdo das colunas deve ser, respectivamente:
Q483282
Sistemas Operacionais
O comando que permite executar outros comandos como administrador do sistema é:
Q483281
Sistemas Operacionais
Os arquivos ficam organizados em pastas distintas chamadas diretórios. Observe os diretórios abaixo:
/bin – arquivos de configuração e inicialização críticos
/boot – Kernel e arquivos necessários para carregar o kernel
/dev – entradas de dispositivos para terminais, discos, modems, etc.
/etc – comandos necessários para mínima operação do sistemas
Assinale a opção que contém aqueles que estão com o conteúdo trocado.
/bin – arquivos de configuração e inicialização críticos
/boot – Kernel e arquivos necessários para carregar o kernel
/dev – entradas de dispositivos para terminais, discos, modems, etc.
/etc – comandos necessários para mínima operação do sistemas
Assinale a opção que contém aqueles que estão com o conteúdo trocado.
Q483280
Sistemas Operacionais
O daemon “cron” possui a função de gerenciar:
Q483279
Sistemas Operacionais
Processos de automatização de tarefas mais complexas pode exigir a verificação de uma ação para a execução de uma segunda ação somente se a primeira apresentar erro.
Dentre as opções relacionadas abaixo, a que representa uma linha de script de bash que executará “comando02” somente se “comando01” apresentar erro é:
Dentre as opções relacionadas abaixo, a que representa uma linha de script de bash que executará “comando02” somente se “comando01” apresentar erro é:
Q483278
Sistemas Operacionais
O comando chmod modifica as permissões de um arquivo. Observe as permissões do arquivo de nome arquivo.txt, listado pelo comando ls com opção -l:
# ls -l arquivo.txt
-rw-rw-r-- 1 root root 23 Jan 3 18:04 arquivo.txt
Após a execução do comando chmod, as permissões do arquivo foram alteradas, conforme a seguir:
# ls -l arquivo.txt
-rwxrw-r-- 1 root root 23 Jan 3 18:04 arquivo.txt
Para que o arquivo.txt recebesse a letra “x” para o dono, permitindo a execução do arquivo, o comando executado foi:
# ls -l arquivo.txt
-rw-rw-r-- 1 root root 23 Jan 3 18:04 arquivo.txt
Após a execução do comando chmod, as permissões do arquivo foram alteradas, conforme a seguir:
# ls -l arquivo.txt
-rwxrw-r-- 1 root root 23 Jan 3 18:04 arquivo.txt
Para que o arquivo.txt recebesse a letra “x” para o dono, permitindo a execução do arquivo, o comando executado foi:
Q483277
Programação
Em um ambiente jboss 6, pode-se acessar o console web de gerenciamento utilizando a seguinte porta padrão, pré-definida na instalação:
Conheça nossos planos