Sort based on certain value in a column


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# 1  
Sort based on certain value in a column

Hi,

i need to sort content of files based on a specific value. An example as below.

Input1.txt
Code:
Col_1
SW_MH2_ST
ST_F72_9S
SW_MH3_S6
Col_2
SW_MH3_AS7
ST_S15_9CH
SW_MH3_AS8
SW_MH3_ST
Col_3
ST_M93_SZ
ST_C16_TC


the output that i want is to sort based on "Col_X" (X is the number) as bold.

output.txt
Code:
Col_1
ST_F72_9S
SW_MH2_ST
SW_MH3_S6
Col_2
ST_S15_9CH
SW_MH3_AS7
SW_MH3_AS8
SW_MH3_ST
Col_3
ST_C16_TC
ST_M93_SZ

Tried different kind of sort command but the results is not what i expected. I have many files that i need to sort and they contains different number of "Col_X" (eg: Col_20). Could u guys pls help me on this. Thanks

Last edited by redse171; 05-02-2014 at 05:29 PM.. Reason: to add filename
# 2  
Could you please post example input and expected output? The way the question is worded right now it is hard to see what you mean.
# 3  
Hi jim mcnamara,

I just edited the filename in my question above as it seems confusing. Ok, the sample input is "input1.txt" and the sample output is "output.txt". Thanks
# 4  
try:
Code:
awk '
/^Col/ {col[++c]=$0; next;}
{data[c,NR]=$0;}
END {
   for (i=1; i<=c ; i++) {
      print col[i];
      for (j=1; j<=NR; j++) if (data[i,j]) ar[data[i,j]]=data[i,j];
      n=asort(ar);
      for (l=1; l<=n; l++) print ar[l];
      delete ar;
   }
} ' Input.txt

# 5  
Hi rdrtx1,

i tried but got this error: "function asort never defined". It seems that i could not use "asort".
# 6  
try:
Code:
awk '
/^Col/ {col[++c]=$0; next;}
{data[c,NR]=$0;}
END {
   for (i=1; i<=c ; i++) {
      print col[i];
      for (j=1; j<=NR; j++) if (data[i,j]) ar=ar "\n" data[i,j];
      sub("^\n","", ar);
      sort="sort";
      print ar | sort;
      close(sort);
      ar="";
   }
} ' Input.txt

# 7  
Hi rdrtx1,

It works perfectly! Thanks a ton. If u dont mind, can u pls explain the codes? Thanks.
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