README.md



Unix Assignment

- Basanta Bista

Data Inspection

Inspection of data to figure out the header and number of rows

head -n 5 snp_position.txt

tail -n 5 snp_position.txt

head -n 5 fang_et_al_genotypes.txt

head -n 5 fang_et_al_genotypes.txt

wc fang_et_al_genotypes.txt

wc snp_position.txt

Sorting files before joining them

We need the header intact for further processing, so first line saves the header to file and the second adds the sorted data to the file other wise the header will be sorted as well

head -n 1 snp_position.txt > snp_sorted.txt

tail -n+2 snp_position.txt | sort -k1,1 >>snp_sorted.txt

Rearranging the columns in the file according to final output

awk 'BEGIN {FS="\t"; OFS="\t"} {print $1, $3, $4, $2, $5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15}' snp_sorted.txt >snp_sorted_col.txt

Zea mays (Maize)

Filtering only maize data from genotype dataset

head -n 1 fang_et_al_genotypes.txt > maize_genotypes.txt

grep -E "(ZMMIL|ZMMLR|ZMMMR)" fang_et_al_genotypes.txt >>maize_genotypes.txt

Transposing the filtered data

awk -f transpose.awk maize_genotypes.txt > transposed_maize_genotypes.txt

Sorting the data before join

The second and third row do not contain genotype data, so the second command skips them while retaining the header

head -n 1 transposed_maize_genotypes.txt > maize_sorted.txt

tail -n+4 transposed_maize_genotypes.txt | sort -k1,1 >>maize_sorted.txt

Joining the two files

-t "[Ctrl+V, tab ]" = -t "" in Unix to retain tab separated format of the output

join -1 1 -2 1 --header -t " [Ctrl+V, tab ] " snp_sorted_col.txt maize_sorted.txt > maize_joined.txt

Creating 10 files (1 for each chromosome) with SNPs ordered based on increasing position values and with missing data encoded by this symbol: ?

head -n 1 maize_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ for (i=1; i <= 10; i++) print $0 >"Chr_"i"_asc.txt"}'

- Creates files with name Chr_(Chromosome number)_asc.txt for each chromosome with just the header row

tail -n +2 maize_joined.txt | sort -k2,2 -k3,3n | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 >= 1 && $2 <= 10) { print >>"Chr_"$2"_asc.txt"}}'

- Sorts the data from the joined file (excluding header) based of Chromosome number followed by ascending order of position, then pipes it into awk which saves data for each chromosome number into respective files.

Creating 10 files (1 for each chromosome) with SNPs ordered based on decreasing position values and with missing data encoded by this symbol: -

head -n 1 maize_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ for (i=1; i <= 10; i++) print $0 >"Chr_"i"_des.txt"}'

- Creates files with name Chr_(Chromosome number)_des.txt for each chromosome with just the header row

tail -n +2 maize_joined.txt | sort -k2,2 -k3,3rn | sed 's/?/-/g' | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 >= 1 && $2 <= 10) { print >>"Chr_"$2"_des.txt"}}'

- Sorts the data from the joined file (excluding header) based of Chromosome number followed by descending order of position, sed replaces ? with -,and then pipes it into awk which saves data for each chromosome number into respective files.

Creating file for unknown position

head -n 1 maize_joined.txt >Chr_unknown.txt

- Creates files with name Chr_unknown.txt

tail -n +2 maize_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 == "unknown") { print >>"Chr_unknown.txt"}}'

- Saves all records with unknown position into the file

Creating file for multiple positions

head -n 1 maize_joined.txt >Chr_multiple.txt

- Creates files with name Chr_multiple.txt

tail -n +2 maize_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 == "multiple") { print >>"Chr_multiple.txt"}}'

- Saves all records with multiple position into the file

Teosinte

Filtering only Teosinte data from genotype dataset

head -n 1 fang_et_al_genotypes.txt > teosinte_genotypes.txt

grep -E "(ZMPBA|ZMPIL|ZMPJA)" fang_et_al_genotypes.txt >>teosinte_genotypes.txt

Transposing the filtered data

awk -f transpose.awk teosinte_genotypes.txt > transposed_teosinte_genotypes.txt

Sorting the data before join

The second and third row do not contain genotype data, so the second command skips them while retaining the header

head -n 1 transposed_teosinte_genotypes.txt > teosinte_sorted.txt

tail -n+4 transposed_teosinte_genotypes.txt | sort -k1,1 >>teosinte_sorted.txt

Joining the two files

-t "[Ctrl+V, tab ]" = -t "" in Unix to retain tab separated format of the output

join -1 1 -2 1 --header -t " [Ctrl+V, tab ] " snp_sorted_col.txt teosinte_sorted.txt > teosinte_joined.txt

Creating 10 files (1 for each chromosome) with SNPs ordered based on increasing position values and with missing data encoded by this symbol: ?

head -n 1 teosinte_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ for (i=1; i <= 10; i++) print $0 >"Chr_"i"_asc_Teosinte.txt"}'

- Creates files with name Chr_(Chromosome number)_asc_Teosinte.txt for each chromosome with just the header row

tail -n +2 teosinte_joined.txt | sort -k2,2 -k3,3n | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 >= 1 && $2 <= 10) { print >>"Chr_"$2"_asc_Teosinte.txt"}}'

- Sorts the data from the joined file (excluding header) based of Chromosome number followed by ascending order of position, then pipes it into awk which saves data for each chromosome number into respective files.

Creating 10 files (1 for each chromosome) with SNPs ordered based on decreasing position values and with missing data encoded by this symbol: -

head -n 1 teosinte_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ for (i=1; i <= 10; i++) print $0 >"Chr_"i"_des_Teosinte.txt"}'

- Creates files with name Chr_(Chromosome number)_des_Teosinte.txt for each chromosome with just the header row

tail -n +2 teosinte_joined.txt | sort -k2,2 -k3,3rn | sed 's/?/-/g' | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 >= 1 && $2 <= 10) { print >>"Chr_"$2"_des_Teosinte.txt"}}'

- Sorts the data from the joined file (excluding header) based of Chromosome number followed by descending order of position, sed replaces ? with -, and then pipes it into awk which saves data for each chromosome number into respective files.

Creating file for unknown position

head -n 1 teosinte_joined.txt >Chr_unknown_Teosinte.txt

- Creates files with name Chr_unknown_Teosinte..txt

tail -n +2 teosinte_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 == "unknown") { print >>"Chr_unknown_Teosinte.txt"}}'

- Saves all records with unknown position into the file

Creating file for multiple positions

head -n 1 teosinte_joined.txt >Chr_multiple_Teosinte.txt

- Creates files with name Chr_multiple_Teosinte.txt

tail -n +2 teosinte_joined.txt | awk 'BEGIN {FS="\t"; OFS="\t"}{ if($2 == "multiple") { print >>"Chr_multiple_Teosinte.txt"}}'

- Saves all records with multiple position into the file