querry reg tar

[Prashanth Waugh]

hi every one,
can anyone tell me what is the o/p of the below given command if I am not giving the name of the tar file while creating the tar.
where it is creating that file.

tar -cvf

regards
atulkumar

[Steven E. Protter]

Shalom atulkumar

If I understand you, the question is what will happen if you do not specify a filename with tar.

The command will error out and perform no work.

tar -cvf *

Produces no output

tar -cvf my.tar

Will produce a recursive tar file of everything from where the command is run.

This is all on the man page.

SEP

[Kenan Erdey]

Hi,

if you don't give the name of file (so don't use f option) it writes to your tape.

Kenan.

[Dennis Handly]

I get:
$ tar -cvf file_name
Attempt to create archive of no files. Nothing dumped.
$ tar -cvf
tar: usage tar [-]{txruc}[eONvVwAfblhm{op}][0-7[lmh]] [tapefile] [blocksize] [[-C directory] file] ...

[Ernesto Cappello]

Hi

I agree with Kenan , in fact if you don't give the name of file (so don't use f option) it writes to your tape (if it exits) otherwise in stdin/stdout.

The standard, for example, is:

tar cvf tmp.tar /tmp

to create a tar file for /tmp directory.

Best regards.
Ernesto

[Avinash20]

tar (1)
The tar command saves and restores archives of files on a magnetic tape, a flexible disk, or a regular file.
The default archive file is /dev/rmt/0m.

SYNOPSIS
# tar [-]key [arg ...] [file | -C directory] ...

f

Use the next arg argument as the name of the archive instead of the default, /dev/rmt/0m. If the name of the file is -, tar writes to standard output or reads from standard input, whichever is appropriate, and the default blocking factor becomes 1. Thus, tar can be used as the head or tail of a pipeline

[SKR_1]

Go ahead with Kenan and Ernesto

Thanks

[Steven Schweda]

> tar -cvf *
> Produces no output

Because "tar" can read your mind, so it knows
that the first argument produced by expanding
"*" is _not_ supposed to go with "-f"?

> if you don't give the name of file (so
> don't use f option) [...]

But he _did_ "use f option".

If the question is, "What does it do?", then
why not try it and see? This would seem (to
me) to be more reliable than asking anyone.

If the question is, "How should I do
?, then you may need to explain
what is.