sed delete but apend right after

[paublo]

hi, im trying to figure out how to have sed delete something then append right after.

so lets say i have

sed -e '/.*IN.*MX.*/d' fileA

now on fileA i can have one line that has "IN MX" or many lines but what i would like to do is delete whatever lines have "IN MX" and add/append in the same place 1 new line.

I tried -e 's/.*IN.*MX.*/XXX/ fileA

but this will replace however many instances of IN MX that it finds, so if it finds 4 it will replace IN MX 4 times with XXX and i just want XXX added/append once.

TIA, P.A

 

[Annihilannic]

Try this awk script:

awk '
        BEGIN { found=0 }
        # replace first IN MX line
        /IN.*MX/ && !found { print "XXX" }
        # skip subsequent IN MX lines
        /IN.*MX/ { found=1; next }
        # print any other line found, and reset flag
        { print; found=0 }
'

Annihilannic.