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# Search shell history file for a pattern.  If you put your whole HISTFILE
# contents into memory, then you probably don't need this, as you can just do:
#
#     $ history | grep PATTERN
#
hgrep() {
    if [ "$#" -eq 0 ] ; then
        printf >&2 'hgrep(): Need a pattern\n'
        return 2
    fi
    if [ -z "$HISTFILE" ] ; then
        printf >&2 'hgrep(): HISTFILE unset or null\n'
        return 2
    fi
    grep "$@" "$HISTFILE"
}