On Fri, 2002-10-25 at 12:07, Todd A. Jacobs wrote:
> On Fri, 25 Oct 2002, Robert P. J. Day wrote:
>
> > there is a handy command, "seq", which will generate sequences of
> > numbers that you can then plug into any command, as in
>
> Heh. With a little work, you can do that in bash without the command
> substitution:
>
> LOOP=0
> while [[ LOOP++ -lt 100 ]]; do mkdir $LOOP; done
>
> Handy to know if you have bash but not sh-utils installed.
>
yep but apparently a lot slower. I figured that it would be quicker but
I guess calling mkdir 100 time as opposed to calling it once with may
args makes the difference. The results of my quick and dirty tests:
[bhughes@bretsony bhughes]$ ls -d $(seq 1 100)
ls: 1: No such file or directory
ls: 2: No such file or directory
ls: 3: No such file or directory
ls: 4: No such file or directory
ls: 5: No such file or directory
<snip>
ls: 97: No such file or directory
ls: 98: No such file or directory
ls: 99: No such file or directory
ls: 100: No such file or directory
[bhughes@bretsony bhughes]$ time mkdir $(seq 1 100)
real 0m0.016s
user 0m0.000s
sys 0m0.020s
[bhughes@bretsony bhughes]$ ls -d $(seq 1 100)
1 14 2 25 30 36 41 47 52 58 63 69 74 8 85 90 96
10 15 20 26 31 37 42 48 53 59 64 7 75 80 86 91 97
100 16 21 27 32 38 43 49 54 6 65 70 76 81 87 92 98
11 17 22 28 33 39 44 5 55 60 66 71 77 82 88 93 99
12 18 23 29 34 4 45 50 56 61 67 72 78 83 89 94
13 19 24 3 35 40 46 51 57 62 68 73 79 84 9 95
[bhughes@bretsony bhughes]$ time rmdir $(seq 1 100)
real 0m0.012s
user 0m0.000s
sys 0m0.010s
[bhughes@bretsony bhughes]$ ls -d $(seq 1 100)
ls: 1: No such file or directory
ls: 2: No such file or directory
<snip>
ls: 98: No such file or directory
ls: 99: No such file or directory
ls: 100: No such file or directory
[bhughes@bretsony bhughes]$ time { LOOP=0;while [[ LOOP++ -lt 100 ]]; do
mkdir $LOOP;done }
real 0m0.507s
user 0m0.150s
sys 0m0.240s
[bhughes@bretsony bhughes]$ ls -d $(seq 1 100)
1 14 2 25 30 36 41 47 52 58 63 69 74 8 85 90 96
10 15 20 26 31 37 42 48 53 59 64 7 75 80 86 91 97
100 16 21 27 32 38 43 49 54 6 65 70 76 81 87 92 98
11 17 22 28 33 39 44 5 55 60 66 71 77 82 88 93 99
12 18 23 29 34 4 45 50 56 61 67 72 78 83 89 94
13 19 24 3 35 40 46 51 57 62 68 73 79 84 9 95
[bhughes@bretsony bhughes]$ time { LOOP=0;while [[ LOOP++ -lt 100 ]]; do
rmdir $LOOP;done }
real 0m0.384s
user 0m0.110s
sys 0m0.270s
[bhughes@bretsony bhughes]$ ls -d $(seq 1 100)
ls: 1: No such file or directory
ls: 2: No such file or directory
ls: 3: No such file or directory
ls: 4: No such file or directory
ls: 5: No such file or directory
<snip>
ls: 100: No such file or directory
interesting I thought.
Bret
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