I get the following result in my script when I run it against my services. The result differs depending on the service but the text pattern showing below is similar. The result of my script is assigned to var1. I need to extract data from this variable
$var1=HOST1*prod*gem.dot*serviceList : svc1 HOST1*prod*kem.dot*serviceList : svc3, svc4 HOST1*prod*fen.dot*serviceList : svc5, svc6
I need to strip the name of the service list from $var1. So the end result should be printed on separate line as follow:
svc1
svc2
svc3
svc4
svc5
svc6
Can you please help with this?
Regards
Using gnu grep and gnu sed:
grep -oP ': *\K\w+(, \w+)?' <<< "$var1" | sed 's/, /\n/'
svc1
svc3
svc4
svc5
svc6
Using sed and grep:
sed 's/[^ ]* :\|,\|//g' <<< "$var1" | grep -o '[^ ]*'
sed deletes every non-whitespace before a colon and commas. Grep just outputs the resulting services one per line.
grep
is the perfect tool for the job.
From man grep
:
-o, --only-matching
Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.
Sounds perfect!
As far as I'm aware this will work on any grep
:
echo "$var1" | grep -o 'svc[0-9]\+'
Matches "svc" followed by one or more digits. You can also enable the "highly experimental" Perl regexp mode with -P
, which means you can use the \\d
digit character class and don't have to escape the +
any more:
grep -Po 'svc\d+' <<<"$var1"
In bash
you can use <<<
(a Here String ) which supplies "$var1"
to grep
on the standard input.
By the way, if your data was originally on separate lines, like:
HOST1*prod*gem.dot*serviceList : svc1
HOST1*prod*kem.dot*serviceList : svc3, svc4
HOST1*prod*fen.dot*serviceList : svc5, svc6
This would be a good job for awk
:
awk -F': ' '{split($2,a,", "); for (i in a) print a[i]}'
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