topic Re: awk not outputting in Operating System - HP-UX

awk not outputting

Keith_107 — Fri, 08 Oct 2004 11:08:15 GMT

I am trying to compare 2 strings in a script two see if the contents of one string is in the other string. For instance, is "cd" in "abcdef"?

I settled on the awk 'index' command which appears to be able to return the starting location of the string within the other string. Using the example above with S1 = "abcdef" and S2 = "cd", awk '{index($S1,$S2);}'
For my purposes a value > 0 would tell me I have a match. Fine.

I'm new to awk and have been trying to get the syntax correct. Sometimes Tru64 gives me a syntax error so I know I'm running awk. The other times I get nothing; the script just stops and I have to Ctrl-C to end it. The same thing happens when I run the simplest of awk commands (awk '{print "Hello";}' from the command line; no response so I have to Ctrl-C to get the Tru64 prompt back.

I have searched Tru64 doc, google and the man page and found lots of info but nothing on how to get the results of my awk commands to display or end up in a script variable.

What am I doing wrong?

KS

Re: awk not outputting

Keith_107 — Fri, 08 Oct 2004 11:10:28 GMT

Oops! Looks like this is in the HPUX forum.

Can anybody move it to Tru64?

KS

Re: awk not outputting

A. Clay Stephenson — Fri, 08 Oct 2004 11:13:56 GMT

No need to move, the answer's the same in HP-UX land. Awk variables are only prefixed with '$' if they are positional variables (e.g $1, $2, ...); other user variables are simply S1, S2 so in your case change $S1 ro S1 and awk will love you.

Re: awk not outputting

Keith_107 — Fri, 08 Oct 2004 11:30:06 GMT

This is in my script:
T1=addchgdel
echo $T1
T2=add
echo $T2
awk '{index(T1,T2);}'
if [ $? -ne 0 ] ; then
echo "hit"
else
echo "miss"
fi

When I run the script it responds:
addchgdel
add
Then it just hangs

Any ideas?

Re: awk not outputting

Muthukumar_5 — Fri, 08 Oct 2004 11:35:48 GMT

Your awk in script is waiting for input there.
You missed to give that,

Try as,

T1=addchgdel
echo $T1
T2=add
echo $T2
echo "$T1 $T2" | awk '{index(T1,T2);}'
if [ $? -ne 0 ] ; then
echo "hit"
else
echo "miss"
fi

It will work there.

HTH.

Re: awk not outputting

Peter Nikitka — Fri, 08 Oct 2004 12:00:47 GMT

If you use Muthukumars approach, you have to change
..
echo "$T1 $T2" | awk '{index(T1,T2);}'
..
to

echo "$T1 $T2" | awk '{index($1,$1;}'

Another possibility is the match-operator:
T1=addchgdel
echo $T1
T2=add
echo $T2
if echo "$T1 $T2" | awk '$2 !~ $1 {exit 1}'
then echo ok
else echo not matched
fi

Re: awk not outputting

Muthukumar_5 — Fri, 08 Oct 2004 12:20:45 GMT

OOOPs. sorry,

Try as,

T1=addchgdel
echo $T1
T2=add
echo $T2

echo "$T1 $T2" | awk '{
print index($1,$2) }'
if [ $? -ne 0 ] ; then
echo "hit"
else
echo "miss"
fi

HTH.

Re: awk not outputting

Muthukumar_5 — Fri, 08 Oct 2004 12:30:59 GMT

We can use awk's match() to do this too as,

T1=addchgdel
echo $T1
T2=add
echo $T2
echo "$T1 $T2" | awk '{ print match($1,$2) }'
if [ $? -ne 0 ] ; then
echo "hit"
else
echo "miss"
fi

It is too work there.

HTH.