People have asked what we'd like out of meetings.
I've been fighting my way through some shell scripting.
It's not until I actually start, to write that, I discover a bunch of
stuff I hadn't heard mentioned.
eg.
Why would you code a line like this?
$IPTABLES_BIN -L traffic_in -vnx | $AWK_BIN '{if (int($1)!=0) print
"INSERT INTO oncs.tblUsage (IPAddress, DataUsage, Direction) VALUES
(\""$8"\","$2",\"I\");"}' > $ONCS_PATH/InData.sql
Why would you use $AWK_BIN rather than just typing awk ?
Answer: When you run the script from a cron session no (or limited)
path is set (depending on factors), or you might use a different command
for a different distro or you might want to use different versions of
the binary, etc.
I've noticed coding a bit like this in scripts before but not understood
why its done.
In most MS languages I've used you can't substitute commands with
variables the way you clearly can in Linux shell scripting.
Ie. I would read the example above as...
StringVariable1 -L traffic_in -vnx | StringVariable2 '{if (int($1)!=0)
print "INSERT INTO oncs.tblUsage (IPAddress, DataUsage, Direction)
VALUES (\""$8"\","$2",\"I\");"}' > StringVariable3/InData.sql
It's quite different to what I was used to in MS VB,VBA,ASP,FoxPro and
others.
I must say that it's extreamly powerful.
Anyway, this was just a quick heads up for others who are playing about
with a bit of shell scripting or having trouble understanding what
they're reading.
HTH's someone
Cheers Don
--
Don Gould
www.thinkdesignprint.co.nz - www.tcn.bowenvale.co.nz -
www.bowenvale.co.nz - www.hearingbooks.co.nz - www.buxtonsquare.co.nz -
skype:ThinkDesignPrint?add - Good ideas: www.solarking.co.nz
