-v SRCH="$AAA" # This is the default interface between shell and awk to convey e.g. shell variables ($AAA) into awk ones (SRCH)
'$0 ~ SRCH # if the entire line / record matches the contents of the SRCH variable
&& # AND
!OCC[$4]++ # if the array element OCC(urrences) indexed by field 4 (the r<...> value) is not yet defined (be aware it is post- incremented and thus defined from then on)
{CNT++ } # increment the CNT (count) variable
END {print CNT+0}' # print the count - if undefined as no $AAA was found, the +0 turns it into an integer 0.
-v SRCH="$AAA" # This is the default interface between shell and awk to convey e.g. shell variables ($AAA) into awk ones (SRCH)
'$0 ~ SRCH # if the entire line / record matches the contents of the SRCH variable
&& # AND
!OCC[$4]++ # if the array element OCC(urrences) indexed by field 4 (the r<...> value) is not yet defined (be aware it is post- incremented and thus defined from then on)
{CNT++ } # increment the CNT (count) variable
END {print CNT+0}' # print the count - if undefined as no $AAA was found, the +0 turns it into an integer 0.
Dear RudiC,
Can you please explain this part
Code:
!OCC[$4]++
a bit more? I dont understand when you mention that it is not yet defined, what you mean by that?
An array element, as is any variable in awk, is created on first reference as an empty entity. Empty, as does 0, represents the boolean value FALSE. So OCC[$4] on its first occurrence, is created, empty, and represents FALSE. The "!" inverts that value, so !OCC[$4] is TRUE, leading to the execution of this branch on its first occurrence. Then ++ does a post-increment on the value so it will be FALSE from then on.
Thank you. Also I have another question. Basically for the input file (calculate_contacts_HS_*.pdb.txt) I want that all lines that have ALA in first or second column sum the third column numerical values of those lines. In the input file given below it would have to be 3 lines that contain ALA in 2nd column (but it can also be in 1st) and 3rd column summed would be: 1.32859+6.90889+0.0962809=8.333761. The example of input file is this:
#!/bin/bash
read -p "amino acid: " AAA
if [[ "ALA ARG ASN ASP CYS GLN GLY GLU HIS ILE \
LEU LYS MET PHE PRO SER THR TRP TYR VAL" =~ $AAA ]]
then
for i in calculate_contacts_HS_*.pdb.txt;
do
awk '{ if ($0 ~ /$AAA/) sum += $3} END {print sum}' $i
done
else
exit 1
fi
but for this script I don't get any value. When I run the script through command the output I get is this:
Code:
Because in my script AAA is assigned to one of the 20 values (ALA, ASN, ARG, ASP, CYS, GLU, GLN, LEU, ILE, LYS, MET, etc.) therefore $AAA can be assigned to different values, but for this case let's assume that $AAA = ALA.
Hello,
Giving those commands:
cat > myfile
1
2
3
^D
cat myfile | awk '{ s=s+$1 ; print s}'
The output is:
1
3
6
It seems like this command iterates each time on a different row so $1 is the first field of each row.. But what caused it to refer to each row ?.
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-0.1
0.6
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