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#1
09-20-2012
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How can I search and change an specific string in a file
Dear All, New to Linux/Unix OS, my Linux version is 2010 x86_64 x86_64 x86_64 GNU/Linux As titled, I wonder if you can help to provide a solution to find and change an specific string in a file The file include a lots of data in following configuration but might be various in different case. Code:
c 1 0 0 0 c 2 0 0.99999997 0 c 3 0.99999997 0 0 c 4 0.99999997 0.99999997 0 c 5 0 -0.19999999 0 c 6 0.99999997 -0.19999999 0 e 1 2 1 0 e 2 4 2 0 e 3 3 4 0 e 4 5 6 2 e 5 1 5 0 e 6 6 3 0 e 7 3 1 0 r 1 silicon r 2 oxide t 1 1 1 3 2 2 -1024 4 t 2 1 3 4 2 -1024 1 -1024 t 3 2 1 5 6 -1022 4 -1024 t 4 2 1 6 3 -1024 1 3 What I want is to find the line which meets following criteria 1. Start with letter 't' 2. Having both string 3 and 4 in the middle three positions 3. Having string -1024 in the rear three positions Only one line should meet said criteria, e.g. Code:
t 2 1 3 4 2 -1024 1 -1024 (criteria are highlighted in red font) I want to find it and change one of the '-1024' into '-1022' e.g. Code:
t 2 1 3 4 2 -1024 1 -1022 (change are highlighted in blue font) Thank you and I look forward to your elegant advice.
Last edited by Corona688; 09-20-2012 at 11:12 AM.. |
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#2
09-20-2012
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try.. Code:
awk '{if($0~/^t/&&$4=="3"&&$5=="4"&&$NF=="-1024"){$NF="-1022";{print $0}}else{print $0}}' filename |
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#3
09-20-2012
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Do the lines to be changed always have 9 fields, or do we have to handle any line with an odd number (greater than or equal to 5) fields?
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#4
09-20-2012
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Code:
awk -f a.awk infile where a.awk: Code:
/^t/ {
mf=(NF/2) + .5;
sub("[.].*", "", mf);
if ((($(mf-1) == 3 || $(mf) == 3 || $(mf+1) == 3) && ($(mf-1) == 4 || $(mf) == 4 || $(mf+1) == 4)) &&
($(NF-2) ~ /^[-]1024/ || $(NF-1) ~ /^[-]1024/ || $(NF) ~ /^[-]1024/)) {
for (i=NF; i > 0; i-- ) {
if ($(i) ~ /^[-]1024/ ) {
sub("-1024", "-1022", $(i));
break;
}
}
print $0;
}
} |
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