Number of read with fastq file name

Question

[Bioinfonext]

I want no. of reads in fastq file with file name, below script can only give no. of reads in fastq file:

File name are like this:

Soil-6_S22_L001.m150-p1.join.fq

Soil-7.m150-p1.join.fq

Soil-8_S32_L001.m150-p1.join.fq

I am interested to get no. of reads with file name like this:

Soil-6              384994

Soil-7              205889

How should I modify below script?

#!/bin/bash

for i in `ls *.fq`; do echo $(cat ${i} | wc -l)/4|bc; done

Kind Regards

[cpad0112]

input fastq:

$ cat test.fq 
@SEQ_ID
GATTTGGGGTTCAAAGCAGTATCGATCAAATAGTAAATCCATTTGTTCAACTCACAGTTT
+
!''*((((***+))%%%++)(%%%%).1***-+*''))**55CCF>>>>>>CCCCCCC65
@SEQ_ID
GATTTGGGGTTCAAAGCAGTATCGATCAAATAGTAAATCCATTTGTTCAACTCACAGTTT
+
!''*((((***+))%%%++)(%%%%).1***-+*''))**55CCF>>>>>>CCCCCCC65
@SEQ_ID
GATTTGGGGTTCAAAGCAGTATCGATCAAATAGTAAATCCATTTGTTCAACTCACAGTTT
+
!''*((((***+))%%%++)(%%%%).1***-+*''))**55CCF>>>>>>CCCCCCC65

with awk to print from one file:

$ awk -v OFS="\t" '/@/ {count++} END{print FILENAME,count}' test.fq 
test.fq 3

from multiple files:

$ parallel awk -v "OFS='\t' '/@/ {count++} END{print FILENAME,count}'" {} ::: *.fq
test10.fq   3
test1.fq    3
test2.fq    3
test3.fq    3
test4.fq    3
test5.fq    3
test6.fq    3
test7.fq    3
test8.fq    3
test9.fq    3


$ find . -type f -name "*.fq" -exec awk -v OFS="\t" '/@/ {count++} END{print FILENAME,count}' {} \; 
./test5.fq  3
./test4.fq  3
./test2.fq  3
./test8.fq  3
./test7.fq  3
./test3.fq  3
./test9.fq  3
./test6.fq  3
./test.fq   3
./test10.fq 3
./test1.fq  3

Answer 1

[lakhujanivijay]

#!/bin/bash

for i in `ls *.fq`; do file_name=$(basename -s .fq $i);  printf "$file_name\t$(cat ${i} | wc -l)/4|bc\n"; done

---

Explanation

file_name=$(basename -s .fq $i)

basename = linux command to strip directory and suffix from filenames

-s = SUFFIX, remove a trailing SUFFIX

file_name=$(basename -s .fq $i) = remove the suffix .fq from the given file and store the name in the variable called file_name

[rturba]

thanks for this code, lakhujanivijay! but when i run it, is not actually printing the calculation. is giving me the number of reads followed by /4|bc\n. i've been trying to figure out where this is not working, but i had no success. can someone help? :)

[cpad0112]

rturba This post is 3 yr old and many programs for such tasks are available now. Please post a new query with example data, your code and expected output.

[rturba]

could you help point me out to those programs, @cpad0112? i was searching online for solutions and this was the best i could find. thank you!

Answer 2

[Pierre Lindenbaum]

for i in  *.fq ; do echo -n "$i " &&  cat $i | paste - - - - | wc -l ; done

Answer 3

[JC]

for i in *.fq; do echo "$( echo $i | perl -pe 's/_.*//')  $( grep -c '@' $i)"