Free Arista Linux Essentials Exam Braindumps (page: 12)

Page 12 of 25

To negate a set in a regular expression pattern, which character is used?

  1. !
  2. ^
  3. ?
  4. -

Answer(s): B


Reference:

https://www.ics.uci.edu/~alspaugh/cls/shr/regularExpression.html



Which special device provides a place for redirecting unneeded data?

  1. /dev/null
  2. /dev/zero
  3. /dev/urandom
  4. /dev/blank

Answer(s): A


Reference:

https://bash.cyberciti.biz/guide//dev/null_discards_unwanted_output



What is the two-character sequence at the top of scripts, which tells the kernel what interpreter to use, called?

  1. Scripthash
  2. Bangscript
  3. Hashscript
  4. Shebang

Answer(s): D


Reference:

https://en.wikipedia.org/wiki/Shebang_(Unix)



If there are three arguments on the command line to a bash script, what will be the contents of $# builtin variable?

  1. 0
  2. 1
  3. 2
  4. 3
  5. 4

Answer(s): D



Page 12 of 25



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