Re: Delete a specific type of files when they exist.
On Fri, 09 Jan 2009 07:36:26 -0700, Eric Blake e...@byu.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Hongyi Zhao on 1/9/2009 6:38 AM: But I cann't figure this out, see the following results on my box: $ echo [ -f *.cache-2 ] [ -f *.cache-2 ] That means there aren't any *.cache-2 files in your directory. Next, try this: $ touch a.cache-2 b.cache-2 $ echo [ -f *.cache-2 ] [ -f a.cache-2 b.cache-2 ] In your example, considering that the a.cache-2 and b.cache-2 have been created by touch command, both the [ -f a.cache-2] and [ -f b.cache-2 ] should have the value: true. My issue is: how can I grab this value, say, by using echo command? Regards, -- .: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Hongyi Zhao on 1/10/2009 3:05 AM: $ touch a.cache-2 b.cache-2 $ echo [ -f *.cache-2 ] [ -f a.cache-2 b.cache-2 ] In your example, considering that the a.cache-2 and b.cache-2 have been created by touch command, both the [ -f a.cache-2] and [ -f b.cache-2 ] should have the value: true. My issue is: how can I grab this value, say, by using echo command? Your question is not cygwin specific; I repeat the advice you have been given to seek out a more generic introduction or online forum that discusses basic shell programming constructs, rather than using this list. That said, there are multiple ways to determine if you have one or more file matching a given pattern. Among others, this (bash-specific) way avoids forking, by using nullglob to avoid confusion when a glob has no matches, and by using printf -v to assign a variable without a command substitution: $ restore= $ shopt -q nullglob || restore='shopt -u nullglob' $ shopt -s nullglob $ printf -v exist %s *.cache-2 $ if [ -n $exist ] ; then echo at least one file exists with .cache-2 extension else echo no .cache-2 exist fi $ eval $restore More portable (but at the cost some forks) is this: $ if [ `echo *.cache-2` != *.cache-2 ] || [ -f *.cache-2 ] ; then echo at least one file exists with .cache-2 extension else echo no .cache-2 exist fi which takes care of the (admittedly rare) case of having a file literally named *.cache-2. - -- Don't work too hard, make some time for fun as well! Eric Blake e...@byu.net -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAklowJoACgkQ84KuGfSFAYB5BgCghRn3ai8bKZ8ui/3mW0LDRQx9 p8AAnjqsDY42G8/AUbFBjs7p3iIC6B+Z =+CqH -END PGP SIGNATURE- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Hongyi Zhao on 1/8/2009 8:55 PM: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? Not cygwin specific. Your problem is that using a glob can expand to more than one argument, whereas [ -f ... ] expects exactly one argument in place of ...; using echo will show you where you went wrong: echo [ -f *.cache-2 ] - -- Don't work too hard, make some time for fun as well! Eric Blake e...@byu.net -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAklnTTsACgkQ84KuGfSFAYAIMQCgkGgi59V+gMaWTBoHt+IVg4eL VmQAoILJS58ZpN1rNerzxw06WxY7ku/T =bKCT -END PGP SIGNATURE- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
On Fri, 09 Jan 2009 06:12:27 -0700, Eric Blake e...@byu.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Hongyi Zhao on 1/8/2009 8:55 PM: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? Not cygwin specific. Your problem is that using a glob can expand to more than one argument, whereas [ -f ... ] expects exactly one argument in place of ...; Thanks for your analyse. using echo will show you where you went wrong: echo [ -f *.cache-2 ] But I cann't figure this out, see the following results on my box: $ echo [ -f *.cache-2 ] [ -f *.cache-2 ] I cann't see any differences between your code and the following one: $ echo something and something something and something Could you please give me some more hints? Regards, -- .: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Hongyi Zhao on 1/9/2009 6:38 AM: But I cann't figure this out, see the following results on my box: $ echo [ -f *.cache-2 ] [ -f *.cache-2 ] That means there aren't any *.cache-2 files in your directory. Next, try this: $ touch a.cache-2 b.cache-2 $ echo [ -f *.cache-2 ] [ -f a.cache-2 b.cache-2 ] See how you just gave 2 arguments (instead of the expected 1) to [ -f? - -- Don't work too hard, make some time for fun as well! Eric Blake e...@byu.net -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAklnYOoACgkQ84KuGfSFAYCkNACgx8OENtoEVdq74p/xmNi+2xUY YogAn2P59SahElPzMaV6F4zMpBeod0MG =hW6u -END PGP SIGNATURE- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA256 Hongyi Zhao wrote: I want to delete the all of the cache-2 files under a directory, so I use the following line to do this: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? find /path/to/directory -name '*.cache-2' -delete Yaakov Cygwin/X -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (Cygwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAklmzBYACgkQpiWmPGlmQSOmSQCfZvId1CpcIoMd944rX6BKtGv7 8o0AoOdW/rs3MjBagIV/qVbBx2odSUZT =pJb/ -END PGP SIGNATURE- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
On Thu, 08 Jan 2009 22:01:26 -0600, Yaakov (Cygwin/X) yselkow...@users.sourceforge.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA256 Hongyi Zhao wrote: I want to delete the all of the cache-2 files under a directory, so I use the following line to do this: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? find /path/to/directory -name '*.cache-2' -delete Good, thanks, I've got it. -- .: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
On Fri, Jan 09, 2009 at 11:55:46AM +0800, Hongyi Zhao wrote: Hi all, I want to delete the all of the cache-2 files under a directory, so I use the following line to do this: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? Why not just rm -f *.cache-2 ? -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Delete a specific type of files when they exist.
On Fri, 9 Jan 2009 00:42:21 -0500, Christopher Faylor cgf-use-the-mailinglist-ple...@cygwin.com wrote: On Fri, Jan 09, 2009 at 11:55:46AM +0800, Hongyi Zhao wrote: Hi all, I want to delete the all of the cache-2 files under a directory, so I use the following line to do this: if [ -f *.cache-2 ] rm *.cache-2 But it seems that this -f parameter in the _if_ command will not work with wildcard, i.e., the _[ -f *.cache-2 ]_ isn't a valid arg. Any hints on this issue? Why not just rm -f *.cache-2 A good idea. Thanks. -- .: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
