[gentoo-user] [OT] Bash scripting

[gentoo-user] [OT] Bash scripting

[Peper]

Hello,
I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how can 
i change it to 'output of pwd/blah' ?

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Peper
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[gentoo-user] Re: [OT] Bash scripting

[Peper]

And one more thing, is there any smarter way to read one line of file then
head -n x file|tail -n 1 ?

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Peper
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Re: [gentoo-user] [OT] Bash scripting

[David Eduardo Gómez Noguera]

On Fri, 2005-11-11 at 14:56 +0100, Peper wrote:
> Hello,
> I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how can 
> i change it to 'output of pwd/blah' ?
> 

try
blah=`pwd`'/blah'

*Note the single quotes do not enclose `pwd`

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Re: [gentoo-user] [OT] Bash scripting

[Stoian Ivanov]

On Friday 11 November 2005 15:56, Peper wrote:
> Hello,
> I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how
> can i change it to 'output of pwd/blah' ?
>
> --
> Best Regards,
> Peper
sdr@sdr ~ $ echo "`pwd`/blah"
/home/sdr/blah
sdr@sdr ~ $
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Re: [gentoo-user] [OT] Bash scripting

[Jonathan Wright]

Peper wrote:
> Hello,
> I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how can 
> i change it to 'output of pwd/blah' ?

What do you mean - are you looking for the actual phrase 'output of 
/path/to/blah', i.e.

$blah='output of $(pwd)/blah'

are are you looking for program output:

$blah=$(./blah)

or

$blah=$($(pwd)/blah))

or are you looking for directory listings?:

$blah=$(ls $(pwd)/blah))

??

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Re: [gentoo-user] Re: [OT] Bash scripting

[Stoian Ivanov]

On Friday 11 November 2005 16:12, Peper wrote:
> And one more thing, is there any smarter way to read one line of file then
> head -n x file|tail -n 1 ?
>
> --
> Best Regards,
> Peper


awk is your friend 
bash's read  is your friend
google is your friend
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Re: [gentoo-user] [OT] Bash scripting

[Allan Spagnol Comar]

#!/bin/sh
#

blah=`pwd`/blah

echo $blah

output:

/home/thor/tmp/blah

holpe it helps.
On 11/11/05, Peper <peper@aster.pl> wrote:
> Hello,
> I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how can
> i change it to 'output of pwd/blah' ?
>
> --
> Best Regards,
> Peper
> --
> gentoo-user@gentoo.org mailing list
>
>


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"Requeires Windows 9x, NT4 or better",
so I´ve installed Linux

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Re: [gentoo-user] [OT] Bash scripting

[Matthias Guede]

Peper wrote:
> Hello,
> I have a var $blah=' `pwd`/blah ' (extra spaces for clearer reading), how can 
> i change it to 'output of pwd/blah' ?

I'm not quiet sure what you mean with "output of pwd/blah".

If you want to assign "/home/me/blah" (or whatever your current 
directory is) you may use the environemnt variable $PWD and the 
expression would read as:
			
			blah=${PWD}/blah

If you insist to use the comand pwd you may write:
	
  	 	blah=`pwd`/blah or blah=$(pwd)/bla

If you want to assign the content of /home/me/blah to your variable use cat:
		
	     blah=`cat ${PWD}/blah` or blah=$(cat ${PWD}/blah)

Matthias

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[gentoo-user] Re: [OT] Bash scripting

[Peper]

> try
> blah=`pwd`'/blah'
>
> *Note the single quotes do not enclose `pwd`

I know how to use `command`, but the problem is that i read blah from file.
blah=`head -n x file|tail -n 1` and in the file i have lines `pwd`/blah. 
$ echo $blah
`pwd`/blah

This is the problem. 

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Re: [gentoo-user] Re: [OT] Bash scripting

[Etaoin Shrdlu]

On Friday 11 November 2005 15:12, Peper wrote:

> And one more thing, is there any smarter way to read one line of file
> then head -n x file|tail -n 1 ?

sed -n -e '12p' file.txt

prints the 12th line of "file.txt"
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[gentoo-user] Re: [OT] Bash scripting

[Peper]

> > And one more thing, is there any smarter way to read one line of file
> > then head -n x file|tail -n 1 ?
>
> sed -n -e '12p' file.txt
>
> prints the 12th line of "file.txt"

Many thanks for that.

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Re: [gentoo-user] Re: [OT] Bash scripting

[davidgn]

Quoting Peper <peper@aster.pl>:

> > try
> > blah=`pwd`'/blah'
> >
> > *Note the single quotes do not enclose `pwd`
> 
> I know how to use `command`, but the problem is that i read blah from
> file.
> blah=`head -n x file|tail -n 1` and in the file i have lines `pwd`/blah.
> 
> $ echo $blah
> `pwd`/blah
> 
> This is the problem. 
> 

try with eval then:


dabicho@localhost ~ $ a='`pwd`/Ranma'
dabicho@localhost ~ $ echo $a
`pwd`/Ranma
dabicho@localhost ~ $  eval cd $a
dabicho@localhost ~/Ranma $ pwd
/home/dabicho/Ranma
dabicho@localhost ~/Ranma $ cd -
/home/dabicho
dabicho@localhost ~ $ eval echo $a
/home/dabicho/Ranma

hope that helps


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UNAMonos Comunicándonos

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[gentoo-user] Re: [OT] Bash scripting

[Peper]

> try with eval then:
Many thanks! I'd tried it before, but you showed me how to use it in proper 
way.

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Peper
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Re: [gentoo-user] Re: [OT] Bash scripting

[Alexander Skwar]

Peper schrieb:
> And one more thing, is there any smarter way to read one line of file then
> head -n x file|tail -n 1 ?

sed.

http://sed.sourceforge.net/sed1line.txt

|[...]
| SELECTIVE PRINTING OF CERTAIN LINES:
|[...]


 # print line number 52
 sed -n '52p'                 # method 1
 sed '52!d'                   # method 2
 sed '52q;d'                  # method 3, efficient on large files


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Re: [gentoo-user] Re: [OT] Bash scripting

[Billy Holmes]

Peper wrote:
> And one more thing, is there any smarter way to read one line of file then
> head -n x file|tail -n 1 ?

if you know the line number from the top:

sed -n ${line}p

if you don't know the number from the top but from the bottom, then tail 
| tail is your best bet...
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Re: [gentoo-user] Re: [OT] Bash scripting

[Stroller]

On Nov 11, 2005, at 2:12 pm, Peper wrote:

> And one more thing, is there any smarter way to read one line of file 
> then
> head -n x file|tail -n 1 ?

Surely so:

	$ echo 'blahpath="/path/to/blahdir"' >> configfile
	$ echo $blahpath
	
	$ source configfile
	$ echo $blahpath
	/path/to/blahdir
	$ blahpath=$blahpath/foo
	$ echo $blahpath
	/path/to/blahdir/foo
	$

Stroller.

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