How to use awk sort by column 3
AwkAwk Problem Overview
I have a file (user.csv)like this
ip,hostname,user,group,encryption,aduser,adattr
want to print all column sort by user,
I tried awk -F ":" '{print|"$3 sort -n"}' user.csv , it doesn't work.
Awk Solutions
Solution 1 - Awk
How about just sort.
sort -t, -nk3 user.csv
where
-
-t,- defines your delimiter as,. -
-n- gives you numerical sort. Added since you added it in your attempt. If your user field is text only then you dont need it. -
-k3- defines the field (key). user is the third field.
Solution 2 - Awk
-
Use awk to put the user ID in front.
-
Sort
-
Use sed to remove the duplicate user ID, assuming user IDs do not contain any spaces.
awk -F, '{ print $3, $0 }' user.csv | sort | sed 's/^.* //'
Solution 3 - Awk
You can choose a delimiter, in this case I chose a colon and printed the column number one, sorting by alphabetical order:
awk -F\: '{print $1|"sort -u"}' /etc/passwd
Solution 4 - Awk
awk -F, '{ print $3, $0 }' user.csv | sort -nk2
and for reverse order
awk -F, '{ print $3, $0 }' user.csv | sort -nrk2
Solution 5 - Awk
Seeing as that the original question was on how to use awk and every single one of the first 7 answers use sort instead, and that this is the top hit on Google, here is how to use awk.
Sample net.csv file with headers:
ip,hostname,user,group,encryption,aduser,adattr
192.168.0.1,gw,router,router,-,-,-
192.168.0.2,server,admin,admin,-,-,-
192.168.0.3,ws-03,user,user,-,-,-
192.168.0.4,ws-04,user,user,-,-,-
And sort.awk:
#!/usr/bin/awk -f
# usage: ./sort.awk -v f=FIELD FILE
BEGIN {
FS=","
}
# each line
{
a[NR]=$0 ""
s[NR]=$f ""
}
END {
isort(s,a,NR);
for(i=1; i<=NR; i++) print a[i]
}
#insertion sort of A[1..n]
function isort(S, A, n, i, j) {
for( i=2; i<=n; i++) {
hs = S[j=i]
ha = A[j=i]
while (S[j-1] > hs) {
j--;
S[j+1] = S[j]
A[j+1] = A[j]
}
S[j] = hs
A[j] = ha
}
}
To use it:
awk sort.awk f=3 < net.csv # OR
chmod +x sort.awk
./sort.awk f=3 net.csv
Solution 6 - Awk
try this -
awk '{print $0|"sort -t',' -nk3 "}' user.csv
OR
sort -t',' -nk3 user.csv
Solution 7 - Awk
awk -F "," '{print $0}' user.csv | sort -nk3 -t ','
This should work
Solution 8 - Awk
To exclude the first line (header) from sorting, I split it out into two buffers.
df | awk 'BEGIN{header=""; $body=""} { if(NR==1){header=$0}else{body=body"\n"$0}} END{print header; print body|"sort -nk3"}'
Solution 9 - Awk
With GNU awk:
awk -F ',' '{ a[$3]=$0 } END{ PROCINFO["sorted_in"]="@ind_str_asc"; for(i in a) print a[i] }' file
See 8.1.6 Using Predefined Array Scanning Orders with gawk for more sorting algorithms.