[gentoo-user] Simple command line stuff

[gentoo-user] Simple command line stuff

[Mark Knecht]

Hi,
   I don't have a single book on Linux. (Amazing...) Can someone
recommend a simple book on command line stuff, or better yet a good
web site on this topic?

   For instance, I wanted to run a specific command on every file in a
directory which will create a new file, so I need to do

command    file1.wav    file1-convert.wav

I need to take each name, create a new name to build the actual
command that gets run and then do that for every file in the
directory, or even in a hierarchy of directories.

Thanks,
Mark

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Re: [gentoo-user] Simple command line stuff

[Jason Cooper]

Mark Knecht (markknecht@gmail.com) scribbled:
> Hi,
>    I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?

Sorry, I picked up most of it from fiddling around, but on to your
problem...

>    For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
> 
> command    file1.wav    file1-convert.wav
> 
> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.


# for file in `ls *.wav`
> do
> newname=`echo ${file} | sed -e "s/\.wav$/-convert.wav/"`
> command -i ${file} -o ${newname} 
> done

chug...chug...chug

and it's done.  But this will only work on files in one subdirectory.
For recursive operations, replace the first line with this:

# for file in `find . -type f -iname "*.wav" -print`

hth,

jason.
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Re: [gentoo-user] Simple command line stuff

[Brett I. Holcomb]

There is a online, downloadable "Advanced Bash" at

http://www.tldp.org/LDP/abs/html/

Which is well worth it.  I printed it out and refer to it.

There are others that I found with a search for "Advanced Bash" but I 
haven't tried them.

On Sun, 9 Oct 2005, Mark Knecht wrote:

> Hi,
>   I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?
>
>   For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
>
> command    file1.wav    file1-convert.wav
>
> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.
>
> Thanks,
> Mark
>
>

-- 

Brett I. Holcomb
brettholcomb@R777bellsouth.net
Registered Linux User #188143
Remove R777 to email
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Re: [gentoo-user] Simple command line stuff

[Daniel Lynch]

On Sun, 2005-10-09 at 19:06 -0700, Mark Knecht wrote:
> Hi,
>    I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?
> 
>    For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
> 
> command    file1.wav    file1-convert.wav
> 
> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.
> 
> Thanks,
> Mark
> 

If you want THE book on command line stuff, I would highly recommend the
book "UNIX Power Tools" published by O'Reilly. It basically goes over
every common UNIX command line tool and covers the common/useful tasks
you might want to do with it. It's a very thick book, but don't be
intimidated by its size,you can read just the sections you need. It's
basically a recipe book. As far as a website, a decent tutorial for
shell scripting is available at: http://www.tldp.org/LDP/abs/html/

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Re: [gentoo-user] Simple command line stuff

[Jason Cooper]

Daniel Lynch (more.on@sbcglobal.net) scribbled:
> If you want THE book on command line stuff, I would highly recommend the
> book "UNIX Power Tools" published by O'Reilly. It basically goes over
> every common UNIX command line tool and covers the common/useful tasks
> you might want to do with it. It's a very thick book, but don't be
> intimidated by its size,you can read just the sections you need. It's
> basically a recipe book. As far as a website, a decent tutorial for
> shell scripting is available at: http://www.tldp.org/LDP/abs/html/

oops, I totally forgot about that,

# emerge -av abs-guide

hth,

jason.
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Re: [gentoo-user] Simple command line stuff

[Nick Rout]

http://rute.2038bug.com/index.html.gz


On Sun, 9 Oct 2005 19:06:53 -0700
Mark Knecht wrote:

> Hi,
>    I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?
> 
>    For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
> 
> command    file1.wav    file1-convert.wav
> 
> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.
> 
> Thanks,
> Mark
> 
> -- 
> gentoo-user@gentoo.org mailing list

-- 
Nick Rout <nick@rout.co.nz>

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Re: [gentoo-user] Simple command line stuff

[Neil Bothwick]

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On Sun, 9 Oct 2005 19:06:53 -0700, Mark Knecht wrote:

>    I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?

In addition to the resources already mentioned, there is an easy
introduction to the command line at http://www.linuxcommand.org/
> 
>    For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
> 
> command    file1.wav    file1-convert.wav

for f in *.wav; do command "$f" "$(basename '$f' .wav)-convert.wav"; done

> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.

This works for a single directory, to recurse you'd need something like
find.

find somedir -name '*.wav' | while read f; do \
  command "$f" "$(dirname '$f')/$(basename '$f' .wav)-convert.wav"; \
  done


-- 
Neil Bothwick

Acute sufferer of B5 deprivation syndrome; Owner of redundant television .

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Re: [gentoo-user] Simple command line stuff

[Spider (D.m.D. Lj.)]

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On Sun, 2005-10-09 at 19:06 -0700, Mark Knecht wrote:
> Hi,
>    I don't have a single book on Linux. (Amazing...) Can someone
> recommend a simple book on command line stuff, or better yet a good
> web site on this topic?
> 
>    For instance, I wanted to run a specific command on every file in a
> directory which will create a new file, so I need to do
> 
> command    file1.wav    file1-convert.wav
> 
> I need to take each name, create a new name to build the actual
> command that gets run and then do that for every file in the
> directory, or even in a hierarchy of directories.
> 
> Thanks,
> Mark



For bash / zsh and other advanced(?-) shells: 

for f in *.wav; do command "$f" "${f/.wav/-convert.wav}";done

The " " are there to prevent files with spaces in them (evil!) from
becoming too annoying and appearing as multiple commandline arguments.


//Spider

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Re: [gentoo-user] Simple command line stuff

[Mark Knecht]

On 10/10/05, Spider (D.m.D. Lj.) <spider@gentoo.org> wrote:
> On Sun, 2005-10-09 at 19:06 -0700, Mark Knecht wrote:
> > Hi,
> >    I don't have a single book on Linux. (Amazing...) Can someone
> > recommend a simple book on command line stuff, or better yet a good
> > web site on this topic?
> >
> >    For instance, I wanted to run a specific command on every file in a
> > directory which will create a new file, so I need to do
> >
> > command    file1.wav    file1-convert.wav
> >
> > I need to take each name, create a new name to build the actual
> > command that gets run and then do that for every file in the
> > directory, or even in a hierarchy of directories.
> >
> > Thanks,
> > Mark
>
>
>
> For bash / zsh and other advanced(?-) shells:
>
> for f in *.wav; do command "$f" "${f/.wav/-convert.wav}";done
>
> The " " are there to prevent files with spaces in them (evil!) from
> becoming too annoying and appearing as multiple commandline arguments.
>
>
> //Spider
>

Thanks to all for the great answers and pointers. I appreciate it very much.

Cheers,
Mark

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Re: [gentoo-user] Simple command line stuff

[Drew Tomlinson]

Mark Knecht wrote:

>On 10/10/05, Spider (D.m.D. Lj.) <spider@gentoo.org> wrote:
>  
>
>>On Sun, 2005-10-09 at 19:06 -0700, Mark Knecht wrote:
>>    
>>
>>>Hi,
>>>   I don't have a single book on Linux. (Amazing...) Can someone
>>>recommend a simple book on command line stuff, or better yet a good
>>>web site on this topic?
>>>
>>>   For instance, I wanted to run a specific command on every file in a
>>>directory which will create a new file, so I need to do
>>>
>>>command    file1.wav    file1-convert.wav
>>>
>>>I need to take each name, create a new name to build the actual
>>>command that gets run and then do that for every file in the
>>>directory, or even in a hierarchy of directories.
>>>
>>>Thanks,
>>>Mark
>>>      
>>>
>>
>>For bash / zsh and other advanced(?-) shells:
>>
>>for f in *.wav; do command "$f" "${f/.wav/-convert.wav}";done
>>
>>The " " are there to prevent files with spaces in them (evil!) from
>>becoming too annoying and appearing as multiple commandline arguments.
>>
>>
>>//Spider
>>
>>    
>>
>
>Thanks to all for the great answers and pointers. I appreciate it very much.
>
>Cheers,
>Mark
>  
>

And just one more point.  The "for" loop is shell dependent and works in 
sh and its cousins.  But if you're using a csh based shell, it's 
"foreach".  Now I'm not commenting on what shells are better than others 
but just wanted to make the point for anyone who might follow this 
thread in the future.

Oh, and another thought.  The "find" command can do this for you as 
well, IIRC.

Cheers,

Drew
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Re: [gentoo-user] Simple command line stuff

[Spider (D.m.D. Lj.)]

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On Tue, 2005-10-11 at 00:25 -0700, Drew Tomlinson wrote:
> 
> Oh, and another thought.  The "find" command can do this for you as 
> well, IIRC.



find . -type f -iname '*.wav' -exec command "{}" "{}".foo \;

   is the syntax, IIRC.   Note the \  that exists to escape the
semicolon, therefore telling find to end processing.

find . -type f -iname '*.wav' |while read LIST; do command "${LIST}"
"${LIST/old/new}" ; done

is another possibility.    Adding limiters to "find" can prevent it from
recursing too deeply.


//Spider

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