Changeset 30722


Ignore:
Timestamp:
08/17/16 17:18:21 (4 years ago)
Author:
ak19
Message:

Remove repeated empty lines, leaving just a single blank line between lines that were separated by many more blank lines.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • other-projects/gti/remove_extra_lines.sh

    r29457 r30722  
    44
    55CLEANVERSION_NAME="$1.clean"
     6
     7# http://stackoverflow.com/questions/2613800/how-to-convert-dos-windows-newline-crlf-to-unix-newline-n-in-bash-script
     8#sed $'s/\r$//' $1 > $CLEANVERSION_NAME
     9#mv $CLEANVERSION_NAME $1
    610
    711# echo $1
     
    3337sed -e '/\s*#.*$/d' -e '/^\s*$/d' $1 > $CLEANVERSION_NAME
    3438
     39
    3540# if the *.clean file is actually empty, print a message
    3641# http://www.unix.com/shell-programming-and-scripting/21753-check-if-file-empty.html
    3742if [[ ! -s $CLEANVERSION_NAME ]] ; then
    3843    echo "@@@ $1 only has comments and empty lines/spaces."
     44else
     45
     46
     47    # remove empty newlines, modifying the file in place.
     48    # http://stackoverflow.com/questions/16414410/delete-empty-lines-using-sed
     49    # http://unix.stackexchange.com/questions/76061/can-sed-remove-double-newline-characters
     50    #sed -i '/^$/d' $1
     51
     52
     53    # remove empty spaces from lines that are purely empty spaces, but leave
     54    # the newline intact, as we'll remove it further below.
     55    sed -e 's/^\s*$//' $1 > $1.tmp
     56
     57    # If there's multiple new lines (3 or more) make them just 2. So leave
     58    # one blank line between lines wherever there were many more blank lines
     59    # http://stackoverflow.com/questions/922449/how-can-i-replace-mutliple-empty-lines-with-a-single-empty-line-in-bash
     60    # "cat with the -s option causes it to remove repeated empty lines from its output"
     61    # Beware: on Solaris, the -s option to cat can mean "cat is silent about missing files"
     62    cat -s $1.tmp > $1
    3963fi ;
    4064rm $CLEANVERSION_NAME
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