Re: OT: awk/sed: how to use a variable in an address range?

[J65nko]

On 9/14/06, O. Hartmann [EMAIL PROTECTED] wrote:
[snip]

To keep a small shell script portable I use awk for separating an ASCII
file from a home brewn scientific model software. The datasets of the
output is enclosed by

/begin_data_set_##/
.
.
.
/end_data_set_##/

## is a two-digit counter, but not necessesaryly equidistant.

I would like to separate the file contaning all datasets via awk or sed
into appropriate files - this is my intention, but I failed.

the simplest way - in theory and in my limitit ability of using sed or
awk - is to print all lines between the (sed/awk) addresses

/begin_data_set_##/
...
/end_data_set_##/

but this does not work due to i cannot use variables in the address
range specifiers neither in awk nor in sed like this:

awk -v nc=$NUMBER '/\/begin_data_set_nc\//,/\/end_data_set_nc\// {
do-something-in-awk}' $input_file  $output_file_$NUMBER

nc in this example is set to the counter of the desired dataset.

I would like to use SED or AWK only due to portability reasons.

[snip]

You have to prefix the variable with $ and use double quotes instead
of single quotes.
The shell will expand a variable within double quotes, but one within
single quotes

$ cat data
/start_1/
This is dataset 1
/end_1/

/start_2/
This is dataset 2
/end_2/

/start_3/
This is dataset 3
/end_3/

$ cat sed_extract

NR=$1

sed -ne /\/start_$NR\//,/\/end_$NR\//p data

$ sh -vx sed_extract 3

NR=$1
+ NR=3

sed -ne /\/start_$NR\//,/\/end_$NR\//p data
+ sed -ne /\/start_3\//,/\/end_3\//p data
/start_3/
This is dataset 3
/end_3/

$ sh -vx sed_extract 2

NR=$1
+ NR=2

sed -ne /\/start_$NR\//,/\/end_$NR\//p data
+ sed -ne /\/start_2\//,/\/end_2\//p data
/start_2/
This is dataset 2
/end_2/

You were close ;)
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OT: awk/sed: how to use a variable in an address range?

[O. Hartmann]

Hello.
This might be OT in FreeBSD list, but hopefully some of yours is 
involved in sophisticated AWK programming.


To keep a small shell script portable I use awk for separating an ASCII 
file from a home brewn scientific model software. The datasets of the 
output is enclosed by


/begin_data_set_##/
.
.
.
/end_data_set_##/

## is a two-digit counter, but not necessesaryly equidistant.

I would like to separate the file contaning all datasets via awk or sed 
into appropriate files - this is my intention, but I failed.


the simplest way - in theory and in my limitit ability of using sed or 
awk - is to print all lines between the (sed/awk) addresses


/begin_data_set_##/
...
/end_data_set_##/

but this does not work due to i cannot use variables in the address 
range specifiers neither in awk nor in sed like this:


awk -v nc=$NUMBER '/\/begin_data_set_nc\//,/\/end_data_set_nc\// { 
do-something-in-awk}' $input_file  $output_file_$NUMBER


nc in this example is set to the counter of the desired dataset.

I would like to use SED or AWK only due to portability reasons.

Any hints are appreciated.

Regards,

oh
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