On 06/30/2015 04:48 PM, Cameron Simpson wrote:
On 30Jun2015 14:35, Bill Oliver <vendor@xxxxxxxxxxxxx> wrote:
On Mon, 29 Jun 2015, jd1008 wrote:
[snip]
Here is the simplest solution and it does what I want without
resorting to awk:
for i in `/bin/ls -1 lists*`; do
sed '/./{H;d;};x;s/\n/={NL}=/g' $i | sort | sed
'1s/={NL}=//;s/={NL}=/\n/g' > $i.sorted.txt
done
I bow before a Master.
So, I'm trying to parse this...
I don't know what "NL" does. From my reading I see the N command
adds the current line to the pattern space with a newline character.
I can't figure out what the "L" does, though, or if NL is a different
command than "N" followed by "L"
The "NL" is not a command. It is simply a piece of text to insert into
the line in place of newlines. (I'm not sure why - you can certainly
hold multiple lines in the hold space.)
So the code pulls lines into the hold space and replaces the newline
characters with the text "NL". Then later it undoes that, replacing
the text "NL" with a newline character.
Personally I tend to use a nontexty character for this kind of
placeholder, such as ^G. Less risk of excountering that in the input
text, and therefore less risk of accidentally mangling it.
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
Don't have awk? Use this simple sh emulation:
#!/bin/sh
echo 'Awk bailing out!' >&2
exit 2
- Tom Horsley <tahorsley@xxxxxxxxxxxxxx>
Hi Cameron,
It is not only NL that newline (in Linux's case it is ^J) that it is
being replaced with.
It is =NL=
Thus I knew it was a simple solution for me because I knew up front my
text files had no such content.
But I agree that for files you do not know the contents of, it is better
to choose
a pattern that would have much less likelihood of being part of the
file, like
==&&##:::@@@!!!
so on , so forth ....
Cheers,
JD
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