Barrick Lab :: ProtocolsMassRename

---+ Overview

This page is designed to give minor examples, and general principles for renaming multiple files at once from the command line based on given criteria and wildcards. Makes use of a command line for loop and the sed command.

---+ Renaming multiple fastq files

   * Assume you have downloaded multiple fastq files which are of format: Samplename-Lane-runID-etc-etc.fastq ... the following command will rename all files to Samplename.fastq:
   * for f in *.fastq;do new_name=$(echo $file|sed 's/-*/.fastq/'); mv -i $file $new_name;done
      * Generic explanation in parts:
      * for f in *.fastq;
         * "for" is the start of a for loop which allows you to do the same thing to multiple files sequentially 
         * generate a generic variable named "f" which is a list of all files in the current directory that end in ".fastq"
         * ; end the existing for loop generation
      * do new_name=$(echo $file|
         * do is what you want to do with each of the entries in the for loop
         * generate a new variable named "new name" with the starting point of the old file name, change the name based on the following sed command.
      * sed 's/-*/.fastq/');
         * "sed" is the name of the command to be called. it is effectively just a find and replace command. It has 3 parts separated by / marks, as follows:
            * "s" tells the command you are dealing with a string
            * "-*" says match everything after and including the first hyphen, change this according to the particular sample so you are sure that it is only matching what you want it to
            * ".fastq" says what you want to replace the matched text with
            * ; break apart the next command as if it were being executed on its own line
      * mv -i $file $new_name
         * "mv -i" is being used as a rename command here, with the -i flag meaning not to overwrite existing file name. This is important if your replacement string is wrong and you are generating multiple final names that are identical.
         * $file $new_name this uses the previously created in line variables to reference the existing file as well as the new name you want to name the file.
      * ;done
         * all for loops end with a "done" command



-- Main.DanielDeatherage - 21 Aug 2014
This topic: Lab > ComputationList > ProtocolsMassRename
Topic revision: r4 - 2014-09-08 - DanielDeatherage