In the line:
with FS set to a colon character, awk is seeing the leading eleven <space> characters as part of field #1. Maybe you'd get better results with:
which I would expect to produce the output:
These 2 Users Gave Thanks to Don Cragun For This Post:
In the line:
with FS set to a colon character, awk is seeing the leading eleven <space> characters as part of field #1. Maybe you'd get better results with:
which I would expect to produce the output:
Hi Don,
Thanks for the explanation. Could you expand a little on the FS=" +|:" part? What are the + and | for?
Joe
--- Post updated at 02:03 PM ---
Quote:
Originally Posted by nezabudka
Thanks for the shorter version, Nezabudka! Im getting some additional output, but I can tweak it.
Hi nezabudka,
Note that with <colon> as the field separator, $2 in the line:
will be 123.123.123.123 Bcast (there are two <space>s between the last "3" and the "B").
Quote:
Originally Posted by joeg1484
Hi Don,
Thanks for the explanation. Could you expand a little on the FS=" +|:" part? What are the + and | for?
Joe
... ... ...
Hi Joe,
In awkFS is a variable that contains an extended regular expression (aka ERE) that is used to match strings of one or more characters that are to be treated as field separators. The default value for FS is a single <space> character. That single <space> is an ERE with a special meaning only in awk that tells awk to ignore all leading and trailing <space>, <tab>, and <newline> characters in each record and treat each remaining sequence of one or more <space>, <tab>, or <newline> characters as a field separator. Note that you won't have any <newline> characters in a record if you're using the default record separator variable (RS) value (which is a <newline> character).
In an ERE, the <vertical-bar> character (|) separates two EREs and if either of those EREs are matched, the matched string is used as a field separator. In an ERE, the <plus-sign> following an ERE matching a single character causes the match to be performed on one or more characters matching the ERE it follows. So in the ERE " +|:", the ERE before the <vertical-bar> (<space><plus-sign>) matches one or more adjacent <space> characters, the ERE after the <vertical-bar> (<colon>) matches exactly one <colon> character. And, with FS set this way, the input line:
will be split into fields as follows:
Field #1 will be the empty string before the 11 <space> characters at the start of the line, field #2 will be set to inet, field #3 will be set to 123.123.123.123, field #4 will be set to Bcast, field #5 will be set to 123.123.123.123, field #6 will be set to Mash, field #7 will be set to 255.255.255.0, and NF (the awk variable specifying the number of fields in the current input record) will be set to 7.
Last edited by Don Cragun; 01-26-2019 at 05:23 AM..
Reason: Add double quotes to keep leading <space> in ICODE tagged text from disappearing.
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