News for hackers. Stuff that matters.

A comment on Show HN: Command Line Challenge.

Re:Show HN: Command Line Challenge by joelthelion on Thursday January 26, 2017 @02:14PM (#13494319) 

  bash(0)> grep GET !$
  + grep GET '!$'
  grep: !$: No such file or directory
Mmm. Fake bash.
[ Parent | on HN ]
Re:Show HN: Command Line Challenge by zoidb on Thursday January 26, 2017 @02:17PM (#13494344)
Every command is in a new subshell
[ Parent | on HN ]
Re:Show HN: Command Line Challenge by contras1970 on Thursday January 26, 2017 @03:01PM (#13494779)
That may be true but the message from grep shows that $! wasn't expanded by the execution evironment.

BTW i get

  # Print "hello world".
  # Hint: There are many ways to print text on
  # the command line, one way is with the 'echo'
  # command.
  # 
  # Try it below and good luck!
  # 
  bash(0)> printf "hello world"
  Internal Server Error
  bash(️)>
[ Parent | on HN ]
Re:Show HN: Command Line Challenge by groner on Thursday January 26, 2017 @06:09PM (#13496239)
history expansion is normally only enabled for interactive shells. They could turn it on, but if there isn't any history because this isn't really interactive, it wouldn't do anything useful.
[ Parent | on HN ]
Re:Show HN: Command Line Challenge by mauvehaus on Thursday January 26, 2017 @02:23PM (#13494393)
find . -type f -exec grep -q 500 {} \; -print

Prints the same list of files as grep -l 500 * , but in a different order; doesn't pass the challenge.

Also, grep -Il 500 * doesn't include README, for some reason. file README doesn't work :-(

[ Parent | on HN ]