touch test{seq 10 10 1000)}

lipun4u · 09-15-2008, 01:06 PM

I want to use seq command inside shell expansion..like this

touch test{seq 10 10 1000)}

is it possible ??

jan61 · 09-15-2008, 01:16 PM

Moin,

Quote:

Originally Posted by lipun4u

I want to use seq command inside shell expansion..like this

touch test{seq 10 10 1000)}

Did you try it? It can't work. You want to create files with the names test10, test20, ...? One way is:

Code:

touch $(seq 10 10 1000 | sed 's/^/test/')

Jan

ghostdog74 · 09-15-2008, 07:43 PM

Code:

touch test{10..100}

lipun4u · 09-15-2008, 09:47 PM

can anyone gv me a good link about this (i think this is known as shell expansion) ???

ghostdog74 · 09-15-2008, 09:59 PM

Quote:

Originally Posted by lipun4u

can anyone gv me a good link about this (i think this is known as shell expansion) ???

check my sig, learn bash link

jan61 · 09-16-2008, 02:29 PM

Moin,

Quote:

Originally Posted by ghostdog74

Code:

touch test{10..100}

uhm:

Code:

jan@jack:~/tmp> touch test{10..100}
jan@jack:~/tmp> ls -l test*
-rw-r--r--  1 jan users   0 2008-09-16 21:27 test{10..100}

???

Jan

radoulov · 09-16-2008, 02:38 PM

If I recall correctly It's a version 3.0 feature, as far as bash is concerned (available in Korn Shell 93 and Z-Shell too).

jan61 · 09-16-2008, 02:54 PM

Moin,

that could be an explanation ;-):

Code:

jan@jack:~/tmp> bash --version
bash --version
GNU bash, version 2.05b.0(1)-release (i586-suse-linux)
Copyright (C) 2002 Free Software Foundation, Inc.

I should upgrade my machine some day ...

Jan

EDIT: But as far as I understand, this will not create files with step 10 numbers from 10 to 1,000 as requested, isn't it? Could this be done in v3.0?

radoulov · 09-16-2008, 03:30 PM

Quote:

Originally Posted by jan61

[...]
EDIT: But as far as I understand, this will not create files with step 10 numbers from 10 to 1,000 as requested, isn't it? Could this be done in v3.0?

If you want to do it in bash without external commands,
you could use something like this:

Code:

touch $(
  for i in {1..1000}; do   
    ((i%10))||printf "test%d\n" $i 
  done
)

Kenhelm · 09-16-2008, 03:39 PM

This creates test10 test20 test30 .......... test990 test1000

Code:

touch test{1..100}0

There are some other examples at
http://www.linuxjournal.com/content/...race-expansion

radoulov · 09-16-2008, 03:41 PM

Quote:

Originally Posted by Kenhelm

This creates test10 test20 test30 .......... test990 test1000

Code:

touch test{1..100}0

There are some other examples at
http://www.linuxjournal.com/content/...race-expansion

Nice one!

If your shell does not support brace expansion and you have GNU seq (read never

):

Code:

touch $(seq -f"test%g" 10 10 1000)