problem using awk


 
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# 1  
Old 03-24-2009
Question problem using awk

Hi there every body
I'm new to shell scripting and there is a problem facing me,, please look at the following piece of code:
Code:
awk   ' 

BEGIN{

FS="<assertion id=\1";

RS="<assertion id=\"2"}/<assertion id=\"1/{print FS$2 > "/home/ds2/test/output.txt"}
' filename

all I wanna do is to replace the 1 found in FS with a variable that can be changed dynamically as follows:

var=1
awk  -v var1="$var" ' /var1/

BEGIN{

FS="<assertion id=\"var1";

RS="<assertion id=\"2"}/<assertion id=\"var1/{print FS$2 > "/home/ds2/test/output.txt"}
' filename

but it doesn't work so pls couldany one help me???
# 2  
Old 03-24-2009
why do you want to replace variable inside FS mean ..(inside the program).. or purpose ?
could you explain little bit?

Thanks
Sha
# 3  
Old 03-24-2009
all what I want to do is to cut a certain text which is found between FS and RS thats all,,,, so if any one have another way or idea please tell me,, thanks in advance
# 4  
Old 03-24-2009
Please post a sample of your input data and an example of the expected output.
# 5  
Old 03-25-2009
Question

the text file contains the following :

<assertions>

<assertion id="1" tag="ref:XSH6TC2:4055:4058">

aio_fsync() shall asynchronously force I/O operations associated
with aio_fildes.

</assertion>

<assertion id="2" tag="ref:XSH6TC2:4060:4061">

if op is O_DSYNC, all queued I/O operations shall be completed as if
by a call to fdatasync().

</assertion>

<assertion id="3" tag="ref:XSH6TC2:4060:4061">

if op is O_SYNC, all queued I/O operations shall be completed as if
by a call to fsync().

</assertion>

<assertion id="4" tag="ref:XSH6TC2:4070:4071">

aio_error() and aio_return() may be used in order to determine
the error status and return status of aio_fsync opertation.

</assertion>

<assertion id="5" tag="ref:XSH6TC2:4072:4073">

When the request is queued, error status is [EINPROGRESS].

</assertion>

and I need to take a part from it like that :

<assertion id="4" tag="ref:XSH6TC2:4070:4071">

aio_error() and aio_return() may be used in order to determine
the error status and return status of aio_fsync opertation.

</assertion>

but the I need id="4" to be a variable so that I can change it and cut the part I want,,,, thanks alot for ur help,,,
# 6  
Old 03-25-2009
Try this:

Code:
awk '/<assertion id="4"/, /<\/assertion>/ {
  sub(/id="[^"]*"/, "id=\""nid"\"")
  print
  }' nid="$var" infile

# 7  
Old 03-25-2009
Power awk 2 field

awk '/<assertion id="4"/, /<\/assertion>/ {
sub(/id="[^"]*"/, "id=\""nid"\"")
print
}' nid="$var" infile
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