Re: make

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Author: Michael Havens
Date:  
To: Main PLUG discussion list
Subject: Re: make
I have 3 files, make.fail, install.fail, and check.fail. I want to check
for two words in those files: error and fail.

would this work?

cat {make,install,check}.fail | grep -i error|fail

I was told to put the 'E' option in to grep. Looking at the man page it
seems that the E option is only useful if I were greping for something that
begins with a '{'. AM I misreading the man page?

man quote:
       GNU grep -E attempts to support traditional usage by assuming that {
is
       not   special  if  it  would  be  the  start  of  an  invalid
interval
       specification.  For example, the command grep -E '{1' searches for
the
       two-character  string  {1  instead  of  reporting a syntax error in
the
       regular expression.  POSIX allows this behavior as  an  extension,
but
       portable scripts should avoid it.




:-)~MIKE~(-:


On Mon, Aug 25, 2014 at 12:24 PM, Michael Havens <> wrote:

> you guys are so helpful! Thanks.
>
> :-)~MIKE~(-:
>
>
> On Sun, Aug 24, 2014 at 7:40 PM, Jon Kettenhofen <> wrote:
>
>> I like visible proofs, so here's a test I ran:
>> (terminal output was as is shown)
>>
>> [jon@localhost ~]$ rm temp
>> [jon@localhost ~]$ echo >>temp
>> [jon@localhost ~]$ echo $?
>> 0
>> [jon@localhost ~]$ cat temp
>>
>> [jon@localhost ~]$ echo >>temp 2>&1
>> [jon@localhost ~]$ echo $?
>> 0
>> [jon@localhost ~]$ cat temp
>>
>>
>> [jon@localhost ~]$
>>
>> as you can see, no errors and the single ">" did not erase the file when
>> used in this manner. So Mike's script should work as intended
>> at least if there is no stderr output.
>>
>> but suppose there was an error? (apologizing for the length of ...)
>>
>> [jon@localhost ~]$ echo "echo" >test
>> [jon@localhost ~]$ echo "ls temp2" >>test
>> [jon@localhost ~]$ # test ls of non-existent file
>> [jon@localhost ~]$ ls temp2
>> ls: cannot access temp2: No such file or directory
>> [jon@localhost ~]$ echo $?
>> 2
>> [jon@localhost ~]$ # see, we get both an error and stderr message
>> [jon@localhost ~]$ # so
>> [jon@localhost ~]$ mv test test.sh
>> [jon@localhost ~]$ chgmod +x test.sh
>> bash: chgmod: command not found...
>> [jon@localhost ~]$ chmod +x test.sh
>> [jon@localhost ~]$ # i'm not perfect!
>> [jon@localhost ~]$ rm temp
>> [jon@localhost ~]$ ./test.sh >>temp
>> ls: cannot access temp2: No such file or directory
>> [jon@localhost ~]$ echo $?
>> 2
>> [jon@localhost ~]$ cat temp
>>
>> [jon@localhost ~]$ ./test.sh >>temp 2>&1
>> [jon@localhost ~]$ echo $?
>> 2
>> [jon@localhost ~]$ cat temp
>>
>>
>> ls: cannot access temp2: No such file or directory
>> [jon@localhost ~]$
>>
>> as you can see, Mike's script will work as he apparently intended,
>> providing he's using a modern version of bash.
>>
>>
>>
>> On 08/24/2014 09:56 PM, James Mcphee wrote:
>>
>>> you've said make, append stdout (default file descriptor 1) to file
>>> make.fail, assign stderr (default filedescriptor 2) the same
>>> filedescriptor as stdout. So... If the intent was to have both stderr
>>> and stdout append make.fail, then it is correct.
>>>
>>>
>>> On Sun, Aug 24, 2014 at 6:06 PM, Michael Havens <
>>> <mailto:bmike1@gmail.com>> wrote:
>>>
>>>     what I really need to know is will this:

>>>
>>>         make>>make.fail 2>&1

>>>
>>>     send stderr and stdout to the file 'make.fail' or did I write it
>>>     incorrectly?

>>>
>>>     :-)~MIKE~(-:

>>>
>>>
>>>     On Sun, Aug 24, 2014 at 2:56 PM, Brian Cluff <
>>>     <mailto:brian@snaptek.com>> wrote:

>>>
>>>         the > will delete any file that it points at even if the command
>>>         doesn't actually output anything.  It will even delete the file
>>>         is the command doesn't exist like if you type grep as gerp
>>>          >file, file will still be created/overwritten.

>>>
>>>         If you want to make sure that your command doesn't overwrite any
>>>         existing files you have to set the noclobber option like:
>>>         $ set -o noclobber

>>>
>>>         A good trick to know:
>>>         You can use the > to delete the contents of a file without
>>>         having to delete and recreate the file by simply doing this:
>>>         $ >yourfile

>>>
>>>         Brian Cluff

>>>
>>>
>>>         On 08/24/2014 02:36 PM, Michael Havens wrote:

>>>
>>>             I have a question about redirections:

>>>
>>>                  make>>make.fail 2>&1

>>>
>>>             tells it make and then to send (>) stderr (2) to stdout (1)
>>>             and also to
>>>             send stdout that way also (&1). finally all of that gets
>>>             sent to a file
>>>             named make.fail (>>). Isn't '>>' actually 'append' whereas
>>>             '>' would
>>>             work just as well so long as the file didn't already exist?
>>>             If the file
>>>             did exist would I get an error or would the file be
>>> overwritten?
>>>             :-)~MIKE~(-:

>>>
>>>
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>>>
>>>
>>> --
>>> James McPhee
>>> <mailto:jmcphe@gmail.com>
>>>
>>>
>>>
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