Re: is there a /bin/sh method to tell the ending of a file
On Mon, Jan 07, 2008 at 11:41:35PM -0800, Gary Kline wrote: On Mon, Jan 07, 2008 at 11:34:08PM -0600, Paul Procacci wrote: Is this what you mean? - #!/bin/sh STRING=mystring.gz if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then echo test; fi --- ~Paul Sorry. You get the credit for the predicate expression; Jon had the simpler (and more readable:) one.But yours is warm+fuzzy in it's cleverness :-) gary -- Gary Kline Seattle BSD Users' Group (seabug) | [EMAIL PROTECTED] Thought Unlimited Org's Alternate Email Site http://www.magnesium.net/~kline To live is not a necessity; but to live honorably...is a necessity. -Kant ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] Quite truthfully, I forget a lot about case/esac most of the time. It always seems to elude me. I guess it doesn't help that I'm a sed mongrel. And for what it's worth, I agree that what I provided wasn't pretty, but at least it gives everyone something to stare at for a while. ;P Have a good night all! ~Paul ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
On Tue, 8 Jan 2008 02:27:29 -0600 Paul Procacci wrote: And for what it's worth, I agree that what I provided wasn't pretty, but at least it gives everyone something to stare at for a while. ;P Great, just like a bad accident on a major road. It isn't pretty, but you just have to look. :- Regards, Chris ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
On Tue, Jan 08, 2008 at 12:01:18AM -0600, Jon Hamilton wrote:
} On Mon, Jan 07, 2008 at 09:10:58PM -0800, Gary Kline wrote:
} Paul Procacci [EMAIL PROTECTED], said on Mon Jan 07, 2008 [11:34:08 PM]:
} Hi All,
}
} Is there an easy way of determing whether a string//filename ends in
} *.gz? using /bin/sh?
} Is this what you mean?
}
} -
} #!/bin/sh
}
} STRING=mystring.gz
}
} if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then
} echo test;
} fi
}
} ---
Works (I assume) but perhaps easier to read and more native might be:
case $STRING in
*\.gz)
echo Found .gz suffix
;;
*)
echo Not a .gz suffix
;;
esac
Sh is a pretty versatile creature; I'm sure there are a thousand more ways
all of which work, and some of which will cause religious arguments for
decades :)
Right. Here's another way using parameter expansion:
| if [ ${STRING##*.} = gz ] ; then
| echo true
| else
| echo false
| fi
The syntax is terse, but pretty popular in the /etc/rc family of scripts.
--
Chris Cowart
Lead Systems Administrator
Network Infrastructure Services, RSSP-IT
UC Berkeley
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Re: is there a /bin/sh method to tell the ending of a file
Is this what you mean? - #!/bin/sh STRING=mystring.gz if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then echo test; fi --- ~Paul On Mon, Jan 07, 2008 at 09:10:58PM -0800, Gary Kline wrote: Hi All, Is there an easy way of determing whether a string//filename ends in *.gz? using /bin/sh? I spend around 20 minutes cobbling together scripts to burn ISO files last night. Then blindly wasted one CD-R file that was gzipped. tar barfs on you,but cdrecord dev=foo.gz writes exactly that. I'd like to add a line that yells at me, then gunzips and does an MD5; then writes. (In C, no prob; C lets me fly, but not /bin/sh. But anyway, if any guru can clue me in, thanks. I think my brain is in Maui for a few days. tiam gary -- Gary Kline Seattle BSD Users' Group (seabug) | [EMAIL PROTECTED] Thought Unlimited Org's Alternate Email Site http://www.magnesium.net/~kline To live is not a necessity; but to live honorably...is a necessity. -Kant ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
On Mon, Jan 07, 2008, Paul Procacci wrote:
Is this what you mean?
-
#!/bin/sh
STRING=mystring.gz
if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then
echo test;
fi
Another way might be
#!/bin/sh
# basename $filename .gz returns $filename unless it has a .gz
# suffix.
[ `basename $filename .gz` = $filename ] || {
echo $filename has a .gz suffix
}
Bill
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Re: is there a /bin/sh method to tell the ending of a file
/Gulp Guess I'm too `new` skool! ;-P Cheers! On Tue, Jan 08, 2008 at 12:47:53AM -0500, John Levine wrote: - #!/bin/sh if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then echo test; fi E. I think that we can now safely take advantage of features added to the shell in the late 1970s. --- #!/bin/sh case $1 in *.gz) echo that is a gzipped file ;; *) echo that is not a gzipped file ;; esac --- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
} On Mon, Jan 07, 2008 at 09:10:58PM -0800, Gary Kline wrote: } Paul Procacci [EMAIL PROTECTED], said on Mon Jan 07, 2008 [11:34:08 PM]: } Hi All, } } Is there an easy way of determing whether a string//filename ends in } *.gz? using /bin/sh? I spend around 20 minutes cobbling together } scripts to burn ISO files last night. Then blindly wasted one CD-R file that } was gzipped. tar barfs on you,but cdrecord dev=foo.gz writes } exactly that. I'd like to add a line that yells at me, then gunzips and does } an MD5; then writes. (In C, no prob; C lets me fly, but not /bin/sh. } But anyway, if any guru can clue me in, thanks. I think my brain is in Maui } for a few days. } } Is this what you mean? } } - } #!/bin/sh } } STRING=mystring.gz } } if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then } echo test; } fi } } --- Works (I assume) but perhaps easier to read and more native might be: case $STRING in *\.gz) echo Found .gz suffix ;; *) echo Not a .gz suffix ;; esac Sh is a pretty versatile creature; I'm sure there are a thousand more ways all of which work, and some of which will cause religious arguments for decades :) -- Jon Hamilton [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
- #!/bin/sh if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then echo test; fi E. I think that we can now safely take advantage of features added to the shell in the late 1970s. --- #!/bin/sh case $1 in *.gz) echo that is a gzipped file ;; *) echo that is not a gzipped file ;; esac --- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
On Tue, Jan 08, 2008 at 12:01:18AM -0600, Jon Hamilton wrote: } On Mon, Jan 07, 2008 at 09:10:58PM -0800, Gary Kline wrote: } Paul Procacci [EMAIL PROTECTED], said on Mon Jan 07, 2008 [11:34:08 PM]: } Hi All, } } Is there an easy way of determing whether a string//filename ends in } *.gz? using /bin/sh? I spend around 20 minutes cobbling together } scripts to burn ISO files last night. Then blindly wasted one CD-R file that } was gzipped. tar barfs on you,but cdrecord dev=foo.gz writes } exactly that. I'd like to add a line that yells at me, then gunzips and does } an MD5; then writes. (In C, no prob; C lets me fly, but not /bin/sh. } But anyway, if any guru can clue me in, thanks. I think my brain is in Maui } for a few days. } } Is this what you mean? } } - } #!/bin/sh } } STRING=mystring.gz } } if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then } echo test; } fi } } --- Works (I assume) but perhaps easier to read and more native might be: case $STRING in *\.gz) echo Found .gz suffix ;; *) echo Not a .gz suffix ;; esac Sh is a pretty versatile creature; I'm sure there are a thousand more ways all of which work, and some of which will cause religious arguments for decades :) You may be right since lots of us toss bats or brickbats over seriously inconsequential things! I'm an agnostic--or possibly a gnostic--when it comes to the [*koff*] ``religious args'' and so forth. I like your first method since I'm reading a great book called AWK AND SED. Irecommend it to anybody who's into the fine points of sed. I keep forgetting about the \1 in sed, but still I'm not that far alongto have come up with your expression, :-) Impressive,thanks! The case/esac block would have occured to me eventully, but not tonight. Anywy, the if/predicate case is what I want. So I can gunzip, then hand off to my cdrecord line and re-gzip. Plus, yell at me ... or whatever. enjoy! gary -- Jon Hamilton [EMAIL PROTECTED] -- Gary Kline Seattle BSD Users' Group (seabug) | [EMAIL PROTECTED] Thought Unlimited Org's Alternate Email Site http://www.magnesium.net/~kline To live is not a necessity; but to live honorably...is a necessity. -Kant ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: is there a /bin/sh method to tell the ending of a file
On Mon, Jan 07, 2008 at 11:34:08PM -0600, Paul Procacci wrote: Is this what you mean? - #!/bin/sh STRING=mystring.gz if [ .gz = `echo \$STRING\ | sed -n 's/.*\(\.gz\)$/\1/p'` ]; then echo test; fi --- ~Paul Sorry. You get the credit for the predicate expression; Jon had the simpler (and more readable:) one.But yours is warm+fuzzy in it's cleverness :-) gary -- Gary Kline Seattle BSD Users' Group (seabug) | [EMAIL PROTECTED] Thought Unlimited Org's Alternate Email Site http://www.magnesium.net/~kline To live is not a necessity; but to live honorably...is a necessity. -Kant ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
