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    Tricks and Hacks


    Find a string within a file in a directory:

    grep -ril “string” dir


    Rename files:

    for f in *; do      ext=””;      [[ $f =~ \. ]] && ext=”.”${f#*.};      mv “$f” “${f%%.*}”_NO$ext;  done


    ls -1 *_bla_* | awk -F”_” -v old=”bla” -v new=”newBla” ‘$2==old{print “mv “$0 ” “$1″_”new”_”$3}’ | sh


    Move inner files to outer directory

    find . -maxdepth 2 -type f -exec mv {} .. \;


    replace a word in all files within a directory

    sed -i ‘.old’ ‘s/phonation/vowels/g’ *.textgrid


    delete part of the name of a file:

    for file in *_auto.TextGrid ; do mv “$file” “${file%_auto.TextGrid}.TextGrid” ; done


    change the extension of a list of files

    for old in *.old; do mv $old `basename $old .old` ; done


    Convert PDF files to PS

    for f in *.pdf; do gs -sDEVICE=ps2write -dNOPAUSE -dBATCH -sOutputFile=./psFigures/$f.ps $f;  done


    select N random lines from a file:

    brew install coreutils

    gsort -R input | head -n 100 >output


    Make a smaller file:

    gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed.pdf input.pdf


    Add something to the path:

    echo $PATH

    export PATH=$PATH:/usr/local/include/faust


    Tricks with  Sox

    for i in *.wav; do /Applications/sox/sox $i equalLengthRecordings/$i trim 0 0.5275; done

    for i in *.wav; do /Applications/sox/sox

    $i ~/Desktop/$i fade 0 0.5275 0.01; done

    for i in *.wav; do /Applications/sox/soxi -s $i; done

    for i in *.wav; do /Applications/sox/sox $i ~/Desktop/$i rate 44100; done


    Tricks with ffmpeg

    for j in *.m4a; do /Applications/ffmpeg -i “$j” -acodec libmp3lame -ab 320k ../mp3/”$j”.mp3 ; done

    for file in *.m4a.mp3 ; do mv “$file” “${file%.m4a.mp3}.mp3” ; done


    Search LaTeX Documentation:

    texdoc library_name


    Find the binding box of a ps

    gs -sDEVICE=bbox -dNOPAUSE -dBATCH  file