creating bash script to automate task for analyzing multiple files

Question

I don't have a lot of experience with scripting.

I have a directory that contains, among many other files, a set of *.phylip files I need to analyze with a program. I would like to automate this task. I think a loop bash shell script would be appropriate, although I could be wrong.

If I was to perform the analysis manually on one .phylip file, I would use the following command in terminal:

./raxmlHPC-SSE3 -m GTRCAT -y -s uce-5.phylip --print-identical-sequences -p 12345 -n uce-5_result

For the bash shell script, I think it would be close to:

#!/bin/sh
for i in $( ls ); do
    ./raxmlHPC-SSE3 -m GTRCAT -y -s uce-5.phylip --print-identical-sequences -p 12345 -n test_5 $i
done

The issue I'm aware of, but don't know how to fix, is the -s option, which specifies the input phylip file. Any suggestions on how to modify the script to do what I need done?

Never parse ls output, refer mywiki.wooledge.org/BashPitfalls#for_i_in_.24.28ls_.2A.mp3.29 page for Bash Pitfalls — Inian
– Inian, Commented Jul 20, 2016 at 13:06

Fazlin · Accepted Answer · 2016-07-20 13:10:02Z

1

Try the below code:

#!/bin/bash
for i in *.phylip
do
    ./raxmlHPC-SSE3 -m GTRCAT -y -s "$i" --print-identical-sequences -p 12345 -n ${i%.phylip}_result
done

-s option will be passed $i which has the file name with .phylip extension in the current directory.

${i%.phylip}_result replaces the .phylip extension with _result which i guess is what you expect. (Ref: Parameter Substitution)

answered Jul 20, 2016 at 13:10

Fazlin

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