Linux batch: create multi folder by combine name with serial number

Question

I'm try to create multi folder by combine string and counter. I don't why what is the wrong with my code:

  echo 'Start'
  let count=0
  for p in {1..10}
  do

      DirName= "dir"
      NUM = "${DirName}${count}"
      let count++
      mkdir $NUM
      mkdir "$NUM"/decoded

  done

I got this kind of error

  ./test.sh: line 6: dir: command not found
  ./test.sh: line 7: NUM: command not found

thank in advance

Are you trying to create "multiple folders" or is "muti folder" something specific? — Yeti, Feb 08 '18 at 19:37
Shell scripts may be picky about white space. Remove the spaces before and after the equal signs. — Bjorn A., Feb 08 '18 at 19:40
Use a shebang for your script so that we know what shell are you using and be specific about it in your tags. — iamauser, Feb 08 '18 at 19:48
@Yeti I attempt to create multi-folders. I am sorry to confuse you. — kaloon, Feb 08 '18 at 20:42
@BjornA. I just deleted the space then it works -: thank you — kaloon, Feb 08 '18 at 20:43

score 3 · Answer 1 · answered Feb 08 '18 at 20:20

No need to use a loop here. The shell will do all the necessary expansion for you. In fact, you're already relying on the shell to expand {1..10} for you as part of your for loop. So you can just use that expansion directly with mkdir. Also by using mkdir -p <path> (make parent directories as needed), you can avoid having to first do mkdir $NUM before doing mkdir $NUM/decoded.

Putting it all together, you can do what you need in a single line:

mkdir -p dir{1..10}/decoded

Edit: To answer your question more directly regarding the command not found errors, it looks like (as Bjorn A. mentioned) you just need to get rid of the spaces before and after the = in your variable assignments.

score 1 · Answer 2 · answered Feb 08 '18 at 20:21

1

You cannot have spaces around the assignment operator in bash. Lines 6 and 7 must look like:

DirName="dir"
NUM="${DirName}${count}"

answered Feb 08 '18 at 20:21

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Linux batch: create multi folder by combine name with serial number

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