On 08/04/2017 02:13 PM, Brandon Allbery wrote:
(back on the desktop for the moment...)
On Fri, Aug 4, 2017 at 5:04 PM, ToddAndMargo <toddandma...@zoho.com
<mailto:toddandma...@zoho.com>> wrote:
On 08/04/2017 01:00 PM, ToddAndMargo wrote:
How do I do this with a perl one liner?
$ echo "a b c d" | awk '{print $2}'
b
$ echo "a b c d" | perl6 -n -e 'say lines ~ "\n" ~ .words[2];'
( c)
without "-n" ".words" doesn't work.
With "-n" "lines" doesn't work
Yes, you've been given a number of things at cross purposes with each other.
So: if you use -n or -p then your expression (via -e) will be run as if
it were wrapped in
for $*IN.lines {
< your -e here >
$_.print; # only if you used -p
}
That is, if you use -n, you do not want to use lines; your code already
runs on each line. If this is not what you want then you don't want -n
or -p. And if you want to use words in that case, you need to invoke it
on whatever string you are trying to split into words (the default is
$_, which will be the current line of input with -n or -p).
This leaves me confused as to what `lines ~ "\n" ~ .words[2]` would be
doing, though. Read all the input into lines, concatenate them all,
append a newline, then try to read *more* input and split to words?
Because that's what you wrote (or would have written without -n; with
-n, you have read the first line into $_, where words will find it, and
lines will eat the remaining lines of input).
What exactly are you trying to do here?
Certainly!
Warning: the following may cause brain damage.
I am looking to extract interface name, IP, and short
mask.
$ ip -o -f inet addr show
1: lo inet 127.0.0.1/8 scope host lo\ valid_lft forever
preferred_lft forever
3: enp7s0 inet 192.168.250.135/24 brd 192.168.250.255 scope global
dynamic enp7s0\ valid_lft 155558sec preferred_lft 155558sec
4: br0 inet 192.168.255.10/24 brd 192.168.255.255 scope global br0\
valid_lft forever preferred_lft forever
5: virbr0 inet 192.168.122.1/24 brd 192.168.122.255 scope global
virbr0\ valid_lft forever preferred_lft forever
$ ip -o -f inet addr show | grep enp | awk '{print "Interface Name <" $2
">"}'
Interface Name <enp7s0>
$ ip -o -f inet addr show | grep enp | awk '{print "IP and Mask <" $4 ">"}'
IP and Mask <192.168.250.135/24>
$ ip -o -f inet addr show | grep enp | awk '{print "IP <" $4 ">"}' | sed
-e 's|/.*|>|'
IP <192.168.250.135>
$ ip -o -f inet addr show | grep enp | awk '{print "<" $4 ">"}' | sed -e
's|.*/|Mask <|'
Mask <24>
Here is my last attempt:
ip -o -f inet addr show | perl6 -e 'for ( lines ) -> $I { if ( $I ~~
/enp/ ) { say "Interface <" ~ .words[1] ~ ">\nIP<" ~ .words[3] ~ ">"; } }'
No such method 'words' for invocant of type 'Any'
in block <unit> at -e line 1
--
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Computers are like air conditioners.
They malfunction when you open windows
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