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Old 09-06-2008, 09:59 AM   #1
sebastian29
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Registered: Mar 2008
Location: Munich
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bash ; changing some data inside of a file


Hello,
I got some data files which I need to change a little bit.
The data file looks like this:
-0,090 0,000

05BA 0B3A

-719,930 -720,000
-719,655 -719,800
-719,340 -719,600
-719,045 -719,200
-718,740 -718,900
-718,435 -718,600
-718,150 -718,300
...
I have to prepare it for octave.
This means the first four lines should be as a comment (I think - %)
and the rest lines should have no commas but dots.
It should look like:
%-0,090 0,000
%
%05BA 0B3A
%
-719.930 -720.000
-719.655 -719.800
-719.340 -719.600
-719.045 -719.200
-718.740 -718.900
-718.435 -718.600
-718.150 -718.300
...
I try to write a bash script, but I can not find a function that looks for a character in a file.
Can you help me?
regards,
sebastian
 
Old 09-06-2008, 10:09 AM   #2
jschiwal
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Location: Fargo, ND
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You could easily do that with sed.

Code:
sed '1,4s/^/%/;s/,/./g' demo
%-0.090 0.000
%
%05BA 0B3A
%
-719.930 -720.000
-719.655 -719.800
-719.340 -719.600
-719.045 -719.200
-718.740 -718.900
-718.435 -718.600
-718.150 -718.300
 
Old 09-06-2008, 10:54 AM   #3
rlhartmann
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Note, to save the changes with sed, redirect into a NEW file:
Quote:
sed '1,4s/^/%/;s/,/./g' originalfile > formattedfile

Last edited by rlhartmann; 09-06-2008 at 10:55 AM. Reason: Fixed a typo
 
Old 09-06-2008, 11:23 AM   #4
ghostdog74
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Code:
exec < file
for i in {0..3} ; do read line; echo "%$line"; done
while read -r line; do echo ${line//,/.}; done
 
Old 09-07-2008, 05:00 AM   #5
sebastian29
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Registered: Mar 2008
Location: Munich
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Hello,
thank you very much for the solution with sed; it works!!
the second task is to do it automatically with all 14000 files in one directory changing the names of the files from 0,00 to 0_00 (0,10 to 0_10) and so on...

greetings,
sebastian
 
Old 09-08-2008, 12:16 AM   #6
chrism01
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Just wrap a loop around the soln above:
Code:
for file in ls
do
    soln-above
done
one way to change filename

new_file=`echo $file |sed 's/,/_/'`
 
Old 09-08-2008, 04:35 PM   #7
sebastian29
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Registered: Mar 2008
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thank you very much, that's very nice solution...
regards
sebastian
 
Old 09-08-2008, 10:56 PM   #8
jschiwal
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In your for loop, the file will be in a variable. You could run the sed line like
sed '1,4s/^/%/;s/,/./g "$file" >"${file//,/_}"

Using variable substition will be quicker and cleaner the using sed to change the filename.

Last edited by jschiwal; 09-08-2008 at 10:57 PM.
 
  


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