i have data in following form:
a, 1
a, 2
a, 3
b, 4
b, 5
b, 6
I would like to achieve it in the following form using bash commands:
a, "[1, 2, 3]"
b, "[4, 5, 6]"
the thing with the quotes and square brackets is not that relevant as just having in second column a collection of items having the same value in the first one.
Absolutely in-efficient way (you should use awk or perl)
file="file.txt"
while read -r k
do
printf '%s, "[%s]"\n' "$k" "$(paste -sd, <(grep -oP "^$k\s*,\s*\K.*" "$file"))"
done < <(cut -d, -f1 "$file" | sort -u)
output:
a, "[1,2,3]"
b, "[4,5,6]"
form.txt
a, 1
a, 2
a, 3
b, 4
b, 5
b, 6
script.sh
#! /bin/bash
set -o errexit # Exit if there is an error
form=${1?"Expected form as argument"}
while read -r line; do
cmd="${line/,[[:space:]]/+=(})"; # replace line with "var+=(val)"
eval ${cmd}; # Process the command, add the value to the array.
done < "${form}"
while read -r array; do
eval echo "${array} [\${$array[#]}]"; # Should print array (val val val)
done < <(cut -f1 -d"," "${form}" | sort | uniq) # Get all the array names
This script should do what you want.
Related
I have two files:
File1:
A
B
C
File2:
2
4
3
I would like to print each line in file1 the number of times found on the corresponding line of file2, and then append each line to a separate file.
Desired output:
A
A
B
B
B
B
C
C
C
Here is one of the approaches I have tried:
touch output.list
paste file1 file2 > test.dict
cat test.dict
A 2
B 4
C 3
while IFS="\t" read -r f1 f2
do
yes "$f1" | head -n "$f2" >> output.list
done < test.dict
For my output I get a bunch of lines that read:
head: : invalid number of lines
Any guidance would be greatly appreciated. Thanks!
Change IFS to an ANSI-C quoted string or remove IFS (since the default value already contains tab).
You can also use a process substitution and prevent the temporary file.
while IFS=$'\t' read -r f1 f2; do
yes "$f1" | head -n "$f2"
done < <(paste file1 file2) > output.list
You could loop through the output of paste and use a c-style for loop in replacement of yes and head.
#!/usr/bin/env bash
while read -r first second; do
for ((i=1;i<=second;i++)); do
printf '%s\n' "$first"
done
done < <(paste file1.txt file2.txt)
If you think that the output is correct add
| tee file3.txt
with a white space in between the command substitution to redirect the output to a stdout and the output file which is file3.txt
done < <(paste file1.txt file2.txt) | tee file3.txt
You can do this with an awk 1-liner
$ awk 'NR==FNR{a[++i]=$0;next}{for(j=0;j<$0;j++)print a[FNR]}' File1 File2
A
A
B
B
B
B
C
C
C
I want to select top 3 results for every line that has the same first two column.
For example the data will look like,
cat data.txt
A A 10
A A 1
A A 2
A A 5
A A 8
A B 1
A B 2
A C 6
A C 5
A C 10
A C 1
B A 1
B A 1
B A 2
B A 8
And for the result I want
A A 10
A A 8
A A 5
A B 2
A B 1
A C 10
A C 6
A C 5
B A 1
B A 1
B A 2
Note that some of the "groups" do not contain 3 rows.
I have tried
sort -k1,1 -k2,2 -k3,3nr data.txt | sort -u -k1,1 -k2,2 > 1.txt
comm -23 <(sort data.txt) <(sort 1.txt)| sort -k1,1 -k2,2 -k3,3nr| sort -u -k1,1 -k2,2 > 2.txt
comm -23 <(sort data.txt) <(cat 1.txt 2.txt | sort)| sort -k1,1 -k2,2 -k3,3nr| sort -u -k1,1 -k2,2 > 3.txt
It seems like it's working but since I am learning to code better was wondering if there was a better way to go about this. Plus, my code will generate many files that I will have to delete.
You can do:
$ sort -k1,1 -k2,2 -k3,3nr file | awk 'a[$1,$2]++<3'
A A 10
A A 8
A A 5
A B 2
A B 1
A C 10
A C 6
A C 5
B A 8
B A 2
B A 1
Explanation:
There are two key items to understand the awk program; associative arrays and fields.
If you reference an empty awk array element, it is an empty container -- ready for anything you put into it. You can use that as a counter.
You state If first two columns are equal...
The sort puts the file in order desired. The statement a[$1,$2] uses the values of the first two fields as a unique entry into an associative array.
You then state ...select top 3 based on descending order of 3rd column...
Once again, the sort put the file into the desired order, and the statement a[$1,$2]++ counts them. Now just count up to three.
awk is organized into blocks of condition {action} The statement a[$1,$2]++<3 is true until there are more than 3 of the same pattern seen.
A wordier version of the program would be:
awk 'a[$1,$2]++<3 {print $0}'
But the default action if the condition is true is to print $0 so it is not needed.
If you are processing text in Unix, you should get to know awk. It is the most powerful tool that POSIX guarantees you will have, and is commonly used for these tasks.
Great place to start is the online book Effective AWK Programming by Arnold D. Robbins
#Dawg has the best answer. This one will be a little lighter on memory, which probably won't be a concern for your data:
sort -k1,2 -k3,3nr file |
awk '
{key = $1 FS $2}
prev != key {prev = key; count = 1}
count <= 3 {print; count++}
'
You can sort the file by first two columns primarily and by the 3rd one numerically secondarily, then read the output and only print the first three lines for each combination of the first two columns.
sort -k1,2 -k3,3rn data.txt \
| while read c1 c2 n ; do
if [[ $c1 == $l1 && $c2 == $l2 ]] ; then
((c++))
else
c=0
fi
if (( c < 3 )) ; then
echo $c1 $c2 $n
l1=$c1
l2=$c2
fi
done
I have a .txt file with the following content:
a 3
a 4
a 5
a 6
b 1
b 3
b 5
c 9
c 10
I am wondering if there is any command (no awk if possible) that can read the .txt file and give the following output (Sorted by the second column):
c 19
a 18
b 9
You can use awk piped to sort:
awk '{sums[$1] += $2} END {for (i in sums) print i, sums[i]}' file | sort -rnk2
c 19
a 18
b 9
sums[$1] += $2 is adding value of $2 in an array sums that is indexed by field #1 ($1).
sort -rnk2 is reverse sorting numerically output of awk on field 2
Use can use this code:
cat 1.txt | awk '{arr[$1]+=$2}END{for (var in arr) print var," ",arr[var]}' | sort -rnk 2
Explanation:
cat 1.txt - read 1.txt file with content
awk - is a language very useful for data manipulation
{arr[$1]+=$2} for each line in content file increase array item with key first field with value of second field. Field separator by default is space.
END{for (var in arr) print var," ",arr[var]}' - after all line is proceeded, print array content
sort -rnk 2 - reverse numeric sort on field 2
Non-awk solutions.
perl
perl -lane '
$sum{$F[0]} += $F[1]
} END {
$, = " ";
print $_, $sum{$_} for reverse sort {$sum{$a} <=> $sum{$b}} keys %sum
' file.txt
bash version 4
declare -A sum
while read key val; do (( sum[$key] += $val )); done < file.txt
for key in "${!sum[#]}"; do echo "$key ${sum[$key]}"; done | sort -rn -k2
non-awk challenge accepted
vars=$(cut -d" " -f1 nums | uniq); paste <(echo "$vars") <(cat <(sed -e 's/ /+=/' nums) <(echo "$vars" | sed 's/$/;/') | bc) | sort -k2,2nr
c 19
a 18
b 9
I've got an input file (input.txt) like this:
name value1 value2
A 3 1
B 7 4
C 2 9
E 5 2
And another file with a list of names (names.txt) like so:
B
C
Using grep -f, I can get all the lines with names "B" and "C"
grep -wFf names.txt input.txt
to get
B 7 4
C 2 9
However, I want to keep the header at the top of the output file, and also rename the column name "name" with "ID". And using grep, to keep the rows with names B and C, the output should be:
**ID** value1 value2
B 7 4
C 2 9
I'm thinking awk should be able to accomplish this, but being new to awk I'm not sure how to approach this. Help appreciated!
While it is certainly possible to do this in awk, the fastest way to solve your actual problem is to simply prepend the header you want in front of the grep output.
echo **ID** value1 value2 > Output.txt && grep -wFf names.txt input.txt >> Output.txt
Update Since the OP has multiple files, we can modify the above line to pull the first line out of the input file instead.
head -n 1 input.txt | sed 's/name/ID/' > Output.txt && grep -wFf names.txt input.txt >> Output.txt
Here is how to do it with awk
awk 'FNR==NR {a[$1];next} FNR==1 {$1="ID";print} {for (i in a) if ($1==i) print}' name input
ID value1 value2
B 7 4
C 2 9
Store the names in an array a
Then test filed #1 if it contains data in array a
I have the following text file:
A,B,C
A,B,C
A,B,C
Is there a way, using standard *nix tools (cut, grep, awk, sed, etc), to process such a text file and get the following output:
A
A
A
B
B
B
C
C
C
You can do:
tr , \\n
and that will generate
A
B
C
A
B
C
A
B
C
which you could sort.
Unless you want to pull the first column then second then third, in which case you want something like:
awk -F, '{for(i=1;i<=NF;++i) print i, $i}' | sort -sk1 | awk '{print $2}'
To explain this, the first part generates
1 A
2 B
3 C
1 A
2 B
3 C
1 A
2 B
3 C
the second part will stably sort (so the internal order is preserved)
1 A
1 A
1 A
2 B
2 B
2 B
3 C
3 C
3 C
and the third part will strip the numbers
You could use a shell for-loop combined with cut if you know in advanced the number of columns. Here is an example using bash syntax:
for i in {1..3}; do
cut -d, -f $i file.txt
done
Try:
awk 'BEGIN {FS=","} /([A-C],)+([A-C])?/ {for (i=1;i<=NF;i++) print $i}' YOURFILE | sort