insert blank line

Hi,

I have a shell script
with (1000) contiguous textlines like

ampl Models/aircrftb.mod  >   Output/aircrftb.out
ampl Models/airport.mod   >   Output/airport.out
ampl Models/aljazzaf.mod  >   Output/aljazzaf.out
ampl Models/allinitc.mod  >   Output/allinitc.out
ampl Models/allinit.mod   >   Output/allinit.out
ampl Models/allinitu.mod  >   Output/allinitu.out
ampl Models/alsotame.mod  >   Output/alsotame.out

before each line I want to insert a new line to print
the model name into a TeX file, like

printf '%s' "  aircrftb & " >> TABLE.TEX
and
printf '%s' "  airport & " >> TABLE.TEX
etc.

How can I do this in sed or awk?
Any help is greatly appreciated.

Dieter

kraft@hm.edu

Dieter Kraft wrote:

> Hi,
>
> I have a shell script
> with (1000) contiguous textlines like
>
>     ampl Models/aircrftb.mod  >   Output/aircrftb.out
>     ampl Models/airport.mod   >   Output/airport.out
>     ampl Models/aljazzaf.mod  >   Output/aljazzaf.out
>     ampl Models/allinitc.mod  >   Output/allinitc.out
>     ampl Models/allinit.mod   >   Output/allinit.out
>     ampl Models/allinitu.mod  >   Output/allinitu.out
>     ampl Models/alsotame.mod  >   Output/alsotame.out
>
> before each line I want to insert a new line to print
> the model name into a TeX file, like
>
> printf '%s' "  aircrftb & " >> TABLE.TEX
> and
> printf '%s' "  airport & " >> TABLE.TEX
> etc.
>
> How can I do this in sed or awk?

(assuming the .mod and the .out name are always the same)

awk -v sq="'" -v dq='"' -F '[/.]' '{
print "printf "sq"%s"sq" "dq"  "$(NF-1)" & "dq" >> TABLE.TEX";
print}' yourscript.sh

--
All the commands are tested with bash and GNU tools, so they may use
nonstandard features. I try to mention when something is nonstandard (if
I'm aware of that), but I may miss something. Corrections are welcome.

pk wrote:
> Dieter Kraft wrote:
> 
>
> (assuming the .mod and the .out name are always the same)
>
> awk -v sq="'" -v dq='"' -F '[/.]' '{
>        print "printf "sq"%s"sq" "dq"  "$(NF-1)" & "dq" >> TABLE.TEX";
>        print}' yourscript.sh
>
Thanks a lot; it's exactly what I need, but it is cryptic for me.
If you have some time could you explain roughly what you did.
Dieter

--
Dieter Kraft
Munich University of Applied Sciences
Department of Mechanical Engineering
dieter.kraft@hm.edu
www.lrz-muenchen.de/~dkraft

Dieter Kraft wrote:
 
> Thanks a lot; it's exactly what I need, but it is cryptic for me.
> If you have some time could you explain roughly what you did.
> Dieter

Well, let's put some comments in.

# input lines are like
#
# ampl Models/aircrftb.mod  >   Output/aircrftb.out
#
# start awk assigning the value ' to the variable "sq", and the value " to
# the variable "dq". Also, fields are delimited by either "/" or ".".

awk -v sq="'" -v dq='"' -F '[/.]' '{

# NF represents the number of fields in the line (separated by either "/"
# or ".", as said). $NF is the last field; $(NF-1) is the penultimate
# field. With your input, this is the filename we are interested in. Now,
# outputting the extra line you need is just a matter of concatenating
# some strings. In awk, strings can be concatenated just by writing one
# next to another. To avoid awkward notations, we have previously
# assigned the single quote and double quote values to the variables "sq"
# and "dq".
# So, let us print the line (spaced for better readability):

print "printf " sq "%s" sq " " dq "  " $(NF-1) " & " dq " >> TABLE.TEX";

# now, print the original line
print

}' yourscript.sh

--
All the commands are tested with bash and GNU tools, so they may use
nonstandard features. I try to mention when something is nonstandard (if
I'm aware of that), but I may miss something. Corrections are welcome.

2008-03-25, 19:18(+01), Dieter Kraft:
[...]
> I have a shell script
> with (1000) contiguous textlines like
>
>     ampl Models/aircrftb.mod  >   Output/aircrftb.out
>     ampl Models/airport.mod   >   Output/airport.out
>     ampl Models/aljazzaf.mod  >   Output/aljazzaf.out
>     ampl Models/allinitc.mod  >   Output/allinitc.out
>     ampl Models/allinit.mod   >   Output/allinit.out
>     ampl Models/allinitu.mod  >   Output/allinitu.out
>     ampl Models/alsotame.mod  >   Output/alsotame.out
>
> before each line I want to insert a new line to print
> the model name into a TeX file, like
>
> printf '%s' "  aircrftb & " >> TABLE.TEX

(note that as it doesn't contain a newline character, strictly
speaking it's not a line).

> and
> printf '%s' "  airport & " >> TABLE.TEX
> etc.
[...]

What about changing your script to:

for mod in Models/*.mod; do
name=${mod#*/}
name=${name%.*}
ampl "$mod" > "Output/$name.out"
printf '  %s & ' "$name" >&3
done 3>> TABLE.TEX

make sure it is interpreted by a POSIX shell (on Solaris, it's
in /usr/xpg4/bin/sh, on most other systems it's in /bin/sh).

--
Stéphane