is redundant. did I learn that when it wasn't redundant? if it never has
> You'll need to add some single quotes to keep the shell from interpreting
> your regex as shell code like this:
>
> grep -E 'error|fail' {make,install,check}.fail
>
> Without the single quotes you are telling the system to cat from your set
> of files and look for lines with the word error and pipe that to a program
> called fail.
>
> I found that I did have to add the -E even thought the man page says that
> in the GNU version of grep the basic and extended regular expressions are
> the same... it appears that is not the case in practice.
>
> Brian Cluff
>
>
> On 08/25/2014 12:56 PM, Michael Havens wrote:
>
>> 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 <bmike1@gmail.com
>> <mailto:bmike1@gmail.com>> wrote:
>>
>> you guys are so helpful! Thanks.
>>
>> :-)~MIKE~(-:
>>
>>
>> On Sun, Aug 24, 2014 at 7:40 PM, Jon Kettenhofen <subs@kexsof.com
>> <mailto:subs@kexsof.com>> 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
>> <bmike1@gmail.com <mailto:bmike1@gmail.com>
>> <mailto:bmike1@gmail.com <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
>> <brian@snaptek.com <mailto:brian@snaptek.com>
>> <mailto:brian@snaptek.com <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
>> jmcphe@gmail.com <mailto:jmcphe@gmail.com>
>> <mailto:jmcphe@gmail.com <mailto:jmcphe@gmail.com>>
>>
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