Very Computer

I've been trying various sed commands to no avail.  Can this be done
with sed, or am I wasting my time and need to go at it a different
way?  If it can be done with sed, how?

Thanks,
Rob Eger

Tech-X Corporation
Boulder, CO

Untested code:

awk '/certain string/ {print "Before stuff"; print;
                       print "After stuff"; next}
                       {print}' infile > outfile

or

awk '/certain string/ {print "Before stuff"}
     {print}
     /certain string/ {print "After stuff"}' infile > outfileprint

Chuck Demas

--
  Eat Healthy        |   _ _   | Nothing would be done at all,

  Die Anyway         |    v    | That no one could find fault with it.

Quote:> I need to go through a file and wherever I find lines that contain a
> certain string I need to insert a line above and below that line.
> Lines that don't contain the string can go straight into the new file.

> I've been trying various sed commands to no avail.  Can this be done
> with sed, or am I wasting my time and need to go at it a different
> way?  If it can be done with sed, how?

sed -e '/a certain string/{
s/^/X\
/
s/$/\
Y/

Quote:}

Will put an "X" on the line before every occurrence of "a certain string" and a
"Y" on the succeeding line.

        Ed.

awk '/PATTERN/ {print "header"; print; print "trailer"; next}
{print}' yourFile

--
Posted via http://dbforums.com

        awk '/certain string/ {b="Before stuff\n";a="\nAfter stuff"} {print b $0 a;b=a=""}'

or:

        awk '{o=$0} /certain string/ {o="Before stuff\n"o"\nAfter stuff"} {print o}'

or (in a ?awk where you can set $0):

        gawk '/certain string/ {$0="Before stuff\n"$0"\nAfter stuff"} {print}'

Regards,

        Ed.

Quote:

> Chuck Demas

( I am assuming you are using bourne shell. C-shell quoting would be different)

or,

sed -e '/regex/!b
        s/^/BEFORE\
/;s/$/\
AFTER/' inputfile

(note: there should be nothing after the trailing \ above, as they are
there to escape the newline)

using nawk:

nawk '/regex/{$0="BEFORE\n"$0"\nAFTER"}1' inputfile

or with perl:

perl -ple '$_="BEFORE\n$_\nAFTER"if/regex/' inputfile