Splitting a folder containing different files into subfolders

Shell Programming and Scripting
1

I have a folder with 4000 (*3) files like

gr_q4_gb-1.anc
gr_q4_gb-1.anc_cdr_st.txt 
gr_q4_gb-1.anc_cdr_tr.txt
gr_q4_gb-2.anc
gr_q4_gb-2.anc_cdr_st.txt 
gr_q4_gb-2.anc_cdr_tr.txt
gr_q4_gb-3.anc
gr_q4_gb-3.anc_cdr_st.txt 
gr_q4_gb-3.anc_cdr_tr.txt
.
.
gr_q4_gb-4000.anc
gr_q4_gb-4000.anc_cdr_st.txt 
gr_q4_gb-4000.anc_cdr_tr.txt

I want to split this into 150 subfolders. The folder containg 3 types of related files, for example gr_q4_gb-2.anc, gr_q4_gb-2.anc_cdr_st.txt and gr_q4_gb-2.anc_cdr_tr.txt are related and shoud go into a same folder. Roughly every subfolder would have 27 (*3) files.

2

Any attempts / ideas / thoughts from your side?

Do all those file names follow the same structure, i.e. they all have gr_q4_gb and .anc as substrings? Are the number in strict sequence?
What should the subdirectories' names look like?

3

I did this after separating the three types of files in three folders

i=0; 
for f in *; 
do 
    d=dir_$(printf %03d $((i/150+1))); 
    mkdir -p $d; 
    mv "$f" $d; 
    let i++; 
done

Then merged the folders together

Yes, the files have same structure and gr_q4_gb and .anc used as substrings and the mumber sre in strict sequence.

the subdirectories names look like MLtr_1, MLtr_2,.... MLtr_150

4

And where and how does that fail?

5

That worked, but I don't think it i good solution.

6

Not sure if this is any better:

for i in {1..27}; do echo mkdir dir_$i; done
for FN in *.anc; do TMP=${FN##*-}; echo mv $FN* dir_$((${TMP%.*}/150+1))/; done

Remove the echo if you like what you see.

7

it gives

bash: */150+1: syntax error: operand expected (error token is "*/150+1")