change value in 2nd line of file using awk

[nuzzy]

Still trying to figure this awk stuff out! I'm confused about if the field you want to replace is on another line. For example I have a file named MMVer.r and in it is:

resource 'tver' (1000) {
"3.0a6"
};

How would I change the "3.0a6" to "3.0a7" then the next time I run the awk command, to 3.0a8 and so forth. Since the field is on the second line I'm not sure how??

 

[Salem]

Try something like this

/resource/ {    # find the resource line
   print        # print it
   getline      # "3.0a6" is now in $0
   # do some stuff
   print        # and print that as well
}

--

 

[nuzzy]

thanks, but I don't know what to do with that...

 

[CaKiwi]

One way to run it is to put it in a file, nuzzy.awk say, and enter

awk -f nuzzy.awk MMVer.r > outfile

/resource/ { # find the resource line
print # print it
getline # "3.0a6" is now in $0
print substr($0,1,length-1) (substr($0,length)+1)
}

CaKiwi

 

[Ygor]

Another way:

awk '
NR==2 {
match($0,"a[0-9]+")
n=substr($0,RSTART+1,RLENGTH-1)
$0=substr($0,1,RSTART) ++n substr($0,RSTART+RLENGTH)
}
{print}
' file1 > file2

 

[nuzzy]

thanks guys...I'll try it when I get to work. What I REALLY need to do is change the value inside MMVer.r without having to create another file. I'll be putting the awk/gawk command in a script and want it to just change the value of "3.0a6". I hope this makes sense.

P.S. - I'll need that a6 value to go higher than 10, i.e. a25...