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How to replace a line content


 
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# 8  
Code:
time=`date '+%m/%d/%y %H:%M:%S`
nawk -v t="$time" '{
if ($1 ~ /\$Header:/ )
printf("%s %s %f %s pkm ship$\n",$1,$2,$3+0.1,t)
else
print
}' filename


Last edited by Yogesh Sawant; 04-21-2008 at 05:41 AM.. Reason: added code tags
# 9  
summer_cherry,

The OP also wants replace the filename and version and also to keeps the exact length of a record.

Regards.
# 10  
Also note that the $Header keyword is not necessarily at start of line, or the first field.

I was under the impression that the file name should stay.
# 11  
Hi Era,

Assume that I have a file VT100.fmm with content:

$Header: FNDSCMON.fmb 115.6 2000/01/11 10:26:10........................pkm ship$
Other Word $Header: FNDSCMON.fmb 115.6 2000/01/11 10:26:10........................pkm ship$
$Header: FNDSCMON.fmb 115.6 2000/01/11 10:26:10........................pkm ship$


and I convert it with:

perl -pe 's!(\$Header: \S+ )(\d+\.\d+) (\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2})( +pkm ship\$)\n!
my ($head, $ver, $date, $tail) = ($1, $2, $3, $4);
my @now = gmtime();
sprintf "%s %3.1f %04i/%02i/%02i %02i:%02i:%02i%s\n",
$head, $ver+0.1, $now[5]+1900, $now[4]+1, $now[3], $now[2], $now[1], $now[0], $tail !e' VT100.fmm


and I view the file using vi, but the lines were not changed, can you please help?

Thanks!
Victor Cheung
# 12  
Quote:
Originally Posted by era
Also note that the $Header keyword is not necessarily at start of line, or the first field.

I was under the impression that the file name should stay.
If the $Header keyword is not at the start of line:

Code:
 #!/bin/sh

curr_dat=`date "+%Y\/%m\/%d"`
curr_time=`date "+%H:%M:%S"`

awk -v dat=$curr_dat -v t=$curr_time -v name="old_version" -v ver="0.1" '
/\$Header:/{
$2=sprintf("%-12s",name)
$3=sprintf("%-5s",ver)
$4=sprintf("%-10s",dat)
$5=sprintf("%-31s",t)
}1
' file

Regards
# 13  
If it's not even $1, the field numbers are wrong, too. Up in comment #5 victorcheung writes:

Quote:
Originally Posted by victorcheung
e.g.2:
Other Word $Header: FNDSCMON.fmb 115.6 2000/01/11 10:26:10........................pkm ship$

could be changed as :

Other Word $Header: FNDSCMON.fmb 115.7 2008/04/21 15:36:50........................pkm ship$
Anyway, awk is not necessarily very robust when it comes to handling binary files, whereas Perl supposedly is.
# 14  
Hi Era,

Thank you very much, it works!!


Hi Frank and Summer,

Thank you for your help!! But the perl works for binary file.


Thanks again!!
Victor Cheung

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