* Adding to the PATH but not if already in $PATH
@ 2005-02-26 18:16 Dog Walker
2005-02-26 22:44 ` chuck gelm
0 siblings, 1 reply; 6+ messages in thread
From: Dog Walker @ 2005-02-26 18:16 UTC (permalink / raw)
To: linux-newbie
I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
result. But I only want it to happen once: iow, if a directory I want
prepended is already in the PATH, do not prepend it again.
Something like:
if "/home/dw/bin" not in $PATH ; then
PATH=/home/dw:$PATH
export PATH
fi
The questions are: Is this the way one guards against multiple additions in
subshells? Is there a way to check for a substring?
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Adding to the PATH but not if already in $PATH
@ 2005-02-26 18:17 Dog Walker
2005-02-26 19:05 ` Eric Bambach
0 siblings, 1 reply; 6+ messages in thread
From: Dog Walker @ 2005-02-26 18:17 UTC (permalink / raw)
To: linux-newbie
I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
result. But I only want it to happen once: iow, if a directory I want
prepended is already in the PATH, do not prepend it again.
Something like:
if "/home/dw/bin" not in $PATH ; then
PATH=/home/dw:$PATH
export PATH
fi
The questions are: Is this the way one guards against multiple additions in
subshells? Is there a way to check for a substring?
-
To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.linux-learn.org/faqs
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding to the PATH but not if already in $PATH
2005-02-26 18:17 Dog Walker
@ 2005-02-26 19:05 ` Eric Bambach
2005-02-26 19:40 ` DogWalker
0 siblings, 1 reply; 6+ messages in thread
From: Eric Bambach @ 2005-02-26 19:05 UTC (permalink / raw)
To: Dog Walker; +Cc: linux-newbie
On Saturday 26 February 2005 12:17 pm, you wrote:
> I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
> result. But I only want it to happen once: iow, if a directory I want
> prepended is already in the PATH, do not prepend it again.
>
> Something like:
>
> if "/home/dw/bin" not in $PATH ; then
> PATH=/home/dw:$PATH
> export PATH
> fi
>
> The questions are: Is this the way one guards against multiple additions in
> subshells? Is there a way to check for a substring?
sed and grep can help.
echo $PATH | grep 'SOMEPATH'
if [ $? == 0 ];then
export PATH
else
PATH=NEWPATH
fi
Check the login on that though, shouldnt be too hard.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.linux-learn.org/faqs
--
----------------------------------------
--EB
> All is fine except that I can reliably "oops" it simply by trying to read
> from /proc/apm (e.g. cat /proc/apm).
> oops output and ksymoops-2.3.4 output is attached.
> Is there anything else I can contribute?
The latitude and longtitude of the bios writers current position, and
a ballistic missile.
--Alan Cox LKML-December 08,2000
----------------------------------------
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding to the PATH but not if already in $PATH
2005-02-26 19:05 ` Eric Bambach
@ 2005-02-26 19:40 ` DogWalker
2005-02-26 20:34 ` Eric Bambach
0 siblings, 1 reply; 6+ messages in thread
From: DogWalker @ 2005-02-26 19:40 UTC (permalink / raw)
To: linux-newbie
[-- Attachment #1: Type: text/plain, Size: 574 bytes --]
"Eric Bambach" <eric@cisu.net> said:
>On Saturday 26 February 2005 12:17 pm, you wrote:
>> I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
>> result. But I only want it to happen once: iow, if a directory I want
>> prepended is already in the PATH, do not prepend it again.
>>
>
[...]
>sed and grep can help.
>
>echo $PATH | grep 'SOMEPATH'
>if [ $? == 0 ];then
> export PATH
>else
> PATH=NEWPATH
>fi
>
>Check the login on that though, shouldnt be too hard.
Great!
Sorry about the double post: kmail did what I said not what
I meant.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding to the PATH but not if already in $PATH
2005-02-26 19:40 ` DogWalker
@ 2005-02-26 20:34 ` Eric Bambach
0 siblings, 0 replies; 6+ messages in thread
From: Eric Bambach @ 2005-02-26 20:34 UTC (permalink / raw)
To: DogWalker; +Cc: linux-newbie
On Saturday 26 February 2005 01:40 pm, you wrote:
> "Eric Bambach" <eric@cisu.net> said:
> >On Saturday 26 February 2005 12:17 pm, you wrote:
> >> I want to prepend a directory to my PATH in my $HOME/.bashrc and export
> >> the result. But I only want it to happen once: iow, if a directory I
> >> want prepended is already in the PATH, do not prepend it again.
>
> [...]
>
> >sed and grep can help.
> >
> >echo $PATH | grep 'SOMEPATH'
> >if [ $? == 0 ];then
> > export PATH
> >else
> > PATH=NEWPATH
> >fi
> >
> >Check the login on that though, shouldnt be too hard.
errr....check the *logic* on that. The syntax is mostly good but treat it as
pseudocode. I wrote that after I just woke up ;) But I think you got the
picture.
> Great!
>
> Sorry about the double post: kmail did what I said not what
> I meant.
--
----------------------------------------
--EB
> All is fine except that I can reliably "oops" it simply by trying to read
> from /proc/apm (e.g. cat /proc/apm).
> oops output and ksymoops-2.3.4 output is attached.
> Is there anything else I can contribute?
The latitude and longtitude of the bios writers current position, and
a ballistic missile.
--Alan Cox LKML-December 08,2000
----------------------------------------
-
To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.linux-learn.org/faqs
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding to the PATH but not if already in $PATH
2005-02-26 18:16 Adding to the PATH but not if already in $PATH Dog Walker
@ 2005-02-26 22:44 ` chuck gelm
0 siblings, 0 replies; 6+ messages in thread
From: chuck gelm @ 2005-02-26 22:44 UTC (permalink / raw)
To: Dog Walker; +Cc: linux-newbie
Dog Walker wrote:
> I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
> result. But I only want it to happen once: iow, if a directory I want
> prepended is already in the PATH, do not prepend it again.
>
> Something like:
>
> if "/home/dw/bin" not in $PATH ; then
> PATH=/home/dw:$PATH
> export PATH
> fi
>
> The questions are: Is this the way one guards against multiple additions in
> subshells? Is there a way to check for a substring?
Hi, DW:
-----
#!/bin/sh
#
# file /usr/local/bin/phwb.sh
#
# This prepends "/home/dw/bin/" to $PATH
PATH=/home/dw/bin:$PATH
export PATH
#end
-----
>touch /home/dw/bin/phwb.sh
>chmod +x /home/dw/bin/phwb.sh
> phwb.sh
If there is already a path to /home/dw/bin,
then the 0 byte file /home/bin/dw/phwb is executed.
else: /usr/local/bin/phwb.sh is executed.
HTH, Chuck
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2005-02-26 22:44 UTC | newest]
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2005-02-26 18:16 Adding to the PATH but not if already in $PATH Dog Walker
2005-02-26 22:44 ` chuck gelm
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2005-02-26 18:17 Dog Walker
2005-02-26 19:05 ` Eric Bambach
2005-02-26 19:40 ` DogWalker
2005-02-26 20:34 ` Eric Bambach
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