Replacing a string with fixed position - Linux

Hi experts, I have an issue with a file called "test" with lines:
PSM_3L_ARO__INT!AT!PM!TR!1417090645!-10800!01/12/14 01:01:02.699 ART!1!!!W004!34!0
PSM_3L_ARO__INT!AT!PM!TR!1417090644!-10800!01/12/14 01:01:01.699 ART!1!!!W004!35!0

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I want to replace the last columns (# 13) with nothing, then I need see:
PSM_3L_ARO__INT!AT!PM!TR!1417090645!-10800!01/12/14 01:01:02.699 ART!1!!!W004!34
PSM_3L_ARO__INT!AT!PM!TR!1417090644!-10800!01/12/14 01:01:01.699 ART!1!!!W004!35

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I tried in a loop with many files like "test" in a list:
    for f in $(cat $TEMP_GIS/lista_$dt.lst)
             do
             awk -F "!" '{print $1 "!" $2 "!" $3 "!" $4 "!" $5 "!" $6 "!" $7 "!" $8 "!" $9 "!" $10 "!" $11 "!" $12}'  $f
          done

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It works fine but doesn't write the files, only show me the output at screen.
Supposed redirecting the output:
 awk -F "!" '{print $1 "!" $2 "!" $3 "!" $4 "!" $5 "!" $6 "!" $7 "!" $8 "!" $9 "!" $10 "!" $11 "!" $12}'  $f > $f

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but generates files "testX", empty
Could you help me? , some other way to do this?
Thankyou, Regards
carlino70Asked:
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gheistCommented:
You need to push output to different file.
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Gerwin Jansen, EE MVETopic Advisor Commented:
Is that last field always 1 character? If so then:

sed -i 's/!.$//' test

will remove that last field from the file 'test'.
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TintinCommented:
Much easier to use sed, ie:

for f in $(cat $TEMP_GIS/lista_$dt.lst)
do
   sed -i  's#![0-9]*$##' $f
done

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Gerwin Jansen, EE MVETopic Advisor Commented:
>> only show me the output at screen
Some basic redirection tips for you:

Use > to redirect output, to a new file for example.

So:

awk -F "!" '{print $1 "!" $2 "!" $3 "!" $4 "!" $5 "!" $6 "!" $7 "!" $8 "!" $9 "!" $10 "!" $11 "!" $12}'  input_file > new_file

after that you have a new_file and an existing file, you may rename afterwards:

mv new_file input_file

that way you changes are in the file with the original name (input_file)
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carlino70Author Commented:
Thanks, both solutions work!
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carlino70Author Commented:
Thanks Gerwin Jansen, I appreciate your contribution

Regards
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