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Swap lines using sed

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# 1  
Old 10-29-2010
Network Swap lines using sed
Hi,

I have to swap two consecutive line using sed in a file.

My text to swap is available in the file x.pl

Code:
#Create & map a common work library
if (!(-e "../work"))
{
 system ("vlib work ../work");
 system ("vmap work ../work");
}
system ("vsimsa -do thiagu_dec.do");

In this i want to swap the line

Code:
system ("vmap work ../work");
}

ie after swapping it should update in the file as

Code:
}
system ("vmap work ../work");

I need this updation in many files in a directory.

Please help me
Last edited by pludi; 10-29-2010 at 04:37 AM..
# 2  
Old 10-29-2010
Hi,

Try:
Code:
sed '/system.*vmap work/ { N ; s/ *// ; s/\(.*\)\n\(.*\)/\2\n\1/ }' infile

Regards,
Birei
# 3  
Old 10-29-2010
Hi birei,

Thanks for the response.
Iam getting an error like this :

sed: -e expression #2, char 61: Unknown option to 's

Thanks,
Anand.D
# 4  
Old 10-29-2010
Hi,

Can't see the problem, but it works in my system, sorry. You could try with 'awk' instead. I hope this works:
Code:
 awk '/system.*vmap/ { getline s; printf "%s\n%s\n", s, gensub(/^ */, "", 1); next } 1' infile

Regards,
Birei
# 5  
Old 10-29-2010
Probably the sed solution in #2 requires a semicolon before the }

Alternatively:
Code:
sed -n '/vmap work/{h;n;G;p;d;};p' infile

# 6  
Old 10-29-2010
Hi Birei,

The awk code is working for me Smilie.

Thanks for your help.

Can you help me by reffering a good document for awk.

Thanks,
Anand
# 7  
Old 10-29-2010
Hi,

1.- UNIX man pages : gawk ()
2.- The GNU Awk User's Guide

Regards,
Birei

---------- Post updated at 03:45 PM ---------- Previous update was at 03:42 PM ----------

Quote:
Originally Posted by Scrutinizer
Probably the sed solution in #2 requires a semicolon before the }
Both solutions work in my system. Perhaps adharmalingam should try it.

Regards,
Birei
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