prepend symbolic link filename

Question

I need a function to prefix any filename starting with 'nfcapd'

original fileset:

/root/netflow3/nfcapd.201402090310 -> /a/b/nfcapd.201402090310
/root/netflow3/nfcapd.201402050400 -> /a/b/nfcapd.201402050400
/root/netflow3/nfcapd.201402100730 -> /a/b/nfcapd.201402100730
/root/netflow3/1.nfcapd.201402100730  -> /a/e/nfcapd.201402100730
/root/netflow3/2.nfcapd.201402100730  -> /a/f/nfcapd.201402100730

with prefix="foo_":

/root/netflow3/foo_nfcapd.201402090310 -> /a/b/nfcapd.201402090310
/root/netflow3/foo_nfcapd.201402050400 -> /a/b/nfcapd.201402050400
/root/netflow3/foo_nfcapd.201402100730  -> /a/b/nfcapd.201402100730
/root/netflow3/1.nfcapd.201402100730  -> /a/e/nfcapd.201402100730
/root/netflow3/2.nfcapd.201402100730  -> /a/f/nfcapd.201402100730

I came up with a function that can add a prefix to any symlink:

readonly PATH_CURRENT_SCRIPT="$(dirname $0)"

sym_rename () {
        local PATH_SOURCE_FILES=$1
        local prefix=$2

        [[ ! -d $PATH_SOURCE_FILES ]] && echo "path $dir not found!  Exiting...." && exit 1

        cd $PATH_SOURCE_FILES
        for f in * ; do mv "$f" "${prefix}_$f" ; done
        cd $PATH_CURRENT_SCRIPT
}

The only problem is that it prefixes everything:

with prefix="foo_":

/root/netflow3/foo_nfcapd.201402090310 -> /a/b/nfcapd.201402090310
/root/netflow3/foo_nfcapd.201402050400 -> /a/b/nfcapd.201402050400
/root/netflow3/foo_nfcapd.201402100730  -> /a/b/nfcapd.201402100730
/root/netflow3/foo_1.nfcapd.201402100730  -> /a/e/nfcapd.201402100730
/root/netflow3/foo_2.nfcapd.201402100730  -> /a/f/nfcapd.201402100730

How can I modify the function to only prefix symlink filenames that start with "nfcapd" ?

Answer 1

Just change your glob to match what you want:

    cd $PATH_SOURCE_FILES
    shopt -s nullglob
    for f in nfcapd* ; do mv "$f" "${prefix}_$f" ; done
    shopt -u nullglob
    cd $PATH_CURRENT_SCRIPT