Sstrhsrtj

I know with mkdir I can do mkdir A B C D E F to create each directory. How do I create directories A-Z or 1-100 with out typing in each letter or number?

It's probably easiest to just use a for loop:

for char in {A..Z}; do

    mkdir $char

done



for num in {1..100}; do

    mkdir $num

done

You need at least bash 3.0 though; otherwise you have to use something like seq

The {} syntax is Bash syntax not tied to the for construct.

mkdir {A..Z}

is sufficient all by itself.

http://www.gnu.org/software/bash/manual/bashref.html#Brace-Expansion

You can also do more complex combinations (try these with echo instead of mkdir so there's no cleanup afterwards):

Compare

$ echo pre-{{F..G},{3..4},{m..n}}-post

pre-F-post pre-G-post pre-3-post pre-4-post pre-m-post pre-n-post

to

$ echo pre-{F..G}{3..4}{m..n}-post

pre-F3m-post pre-F3n-post pre-F4m-post pre-F4n-post pre-G3m-post pre-G3n-post

pre-G4m-post pre-G4n-post

If you have Bash 4, try

$ echo file{0001..10}

file0001 file0002 file0003 file0004 file0005 file0006 file0007 file0008 file0009

file0010

and

$ echo file{0001..10..2}

file0001 file0003 file0005 file0007 file0009

On Linux you can generate sequences of digits with the "seq" command, but this doesn't exist on all Unix systems. For example to generate directories from 1 to 100:

mkdir `seq 1 100`

While you can certainly make directories A to Z with shell utils:

seq 65 90 

    | while read foo; do printf "%bn" `printf '\\x%xn' $foo`; done 

    | xargs mkdir

It's probably a lot less ugly to just use Perl:

perl -e 'foreach (ord "A"..ord "Z") { mkdir chr $_ }'

mkdir direct{1..3} will result in mkdir direct1 direct2 direct3 and so on . Same for {a..z}

mkdir {A..Z}
mkdir {0..100}
mkdir test_{A..Z}
and so on.