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From: Ela on 24 Jun 2008 05:10
Under the same directory, there are a lot of files names in this system:

3-character-prefix+anything

How can I read the 2nd line of the contents and concatenate them
automatically?


e.g.

M01ABC content:
Dear Friends,
Meeting will be held at 10

M01DEF content:
Dear guys,
Meeting will be held at 19

M02DEF content:
Hi,
Meeting will be held at 19


So to generate, say:

M01 content:
Meeting will be held at 10Meeting will be held at 19

M02 content:
Meeting will be held at 19



From: Dave B on 24 Jun 2008 05:43
Ela wrote:

> Under the same directory, there are a lot of files names in this system:
>
> 3-character-prefix+anything
>
> How can I read the 2nd line of the contents and concatenate them
> automatically?
>
>
> e.g.
>
> M01ABC content:
> Dear Friends,
> Meeting will be held at 10
>
> M01DEF content:
> Dear guys,
> Meeting will be held at 19
>
> M02DEF content:
> Hi,
> Meeting will be held at 19
>
>
> So to generate, say:
>
> M01 content:
> Meeting will be held at 10Meeting will be held at 19
>
> M02 content:
> Meeting will be held at 19


awk 'substr(FILENAME,1,3)!=lastf {
if(lastf) {
print lastf " content:";print line
}
line=""
lastf=substr(FILENAME,1,3)
}
FNR==2 {line=line $0; nextfile}
END {print lastf " content:";print line}' file1 file2 ...

--
D.
From: Hermann Peifer on 24 Jun 2008 06:11
On Jun 24, 11:10 am, "Ela" <e...(a)yantai.org> wrote:
> Under the same directory, there are a lot of files names in this system:
>
> 3-character-prefix+anything
>
> How can I read the 2nd line of the contents and concatenate them
> automatically?
>
> e.g.
>
> M01ABC content:
> Dear Friends,
> Meeting will be held at 10
>
> M01DEF content:
> Dear guys,
> Meeting will be held at 19
>
> M02DEF content:
> Hi,
> Meeting will be held at 19
>
> So to generate, say:
>
> M01 content:
> Meeting will be held at 10Meeting will be held at 19
>
> M02 content:
> Meeting will be held at 19

Here another option. Please note that nextfile is a gawk extension.
(The script would work without and just be somewhat slower.)

$ cat script.awk
FNR == 1 {
out = substr(FILENAME, 1, 3)
a[out]
next
}

FNR == 2 {
printf "%s", $0 > out
nextfile
}

END {
for (i in a) {
print "" > i
close(i)
}
}

$ gawk -f script.awk file1 file2 ...
From: Ela on 24 Jun 2008 06:35

"Dave B" <daveb(a)addr.invalid> wrote in message
news:g3qfqb$4qk$1(a)registered.motzarella.org...
> Ela wrote:
>
>> Under the same directory, there are a lot of files names in this system:
>>
>> 3-character-prefix+anything
>>
>> How can I read the 2nd line of the contents and concatenate them
>> automatically?
>>
>>
>> e.g.
>>
>> M01ABC content:
>> Dear Friends,
>> Meeting will be held at 10
>>
>> M01DEF content:
>> Dear guys,
>> Meeting will be held at 19
>>
>> M02DEF content:
>> Hi,
>> Meeting will be held at 19
>>
>>
>> So to generate, say:
>>
>> M01 content:
>> Meeting will be held at 10Meeting will be held at 19
>>
>> M02 content:
>> Meeting will be held at 19
>
>
> awk 'substr(FILENAME,1,3)!=lastf {
> if(lastf) {
> print lastf " content:";print line
> }
> line=""
> lastf=substr(FILENAME,1,3)
> }
> FNR==2 {line=line $0; nextfile}
> END {print lastf " content:";print line}' file1 file2 ...
>
> --
> D.

Do I need to supply all the file names one by one by myself, i.e. how to
call this script? In our last correspondence, I have to do that by myself...


From: Dave B on 24 Jun 2008 06:34
Ela wrote:

>> awk 'substr(FILENAME,1,3)!=lastf {
>> if(lastf) {
>> print lastf " content:";print line
>> }
>> line=""
>> lastf=substr(FILENAME,1,3)
>> }
>> FNR==2 {line=line $0; nextfile}
>> END {print lastf " content:";print line}' file1 file2 ...
>>
>> --
>> D.
>
> Do I need to supply all the file names one by one by myself, i.e. how to
> call this script? In our last correspondence, I have to do that by myself...

That depends. If your files are called "M01xxxx", "M01xxxx", "M02xxxx",
"M03xxxx", you can probably just say M0*, M*, or even * if the directory
contains only those files. The shell will expand them in an ordered list.

--
D.
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