X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=bashrc;h=fff96ac3cbaf2f3d9a28b64a1c476e1a8a4cf489;hb=d9930e7823c007964a023880587f23db98754eb8;hp=1a947db7768d411499b0d38417e84a59bd030f6d;hpb=0112da1a38def39a00d6c3d9fbc07a4efb4fb812;p=scripts.git

diff --git a/bashrc b/bashrc
index 1a947db..fff96ac 100644
--- a/bashrc
+++ b/bashrc
@@ -23,11 +23,11 @@ PRIVATE_BASHRC="${HOME}/private/bashrc.perso"
 
 # If the MANPATH is not set, set it
 
-[ "${MANPATH}" ] || MANPATH=$(manpath)
+[[ "${MANPATH}" ]] || MANPATH=$(manpath)
 
 # If the private bashrc exists, execute it
 
-[ -f "${PRIVATE_BASHRC}" ] && source "${PRIVATE_BASHRC}"
+[[ -f "${PRIVATE_BASHRC}" ]] && source "${PRIVATE_BASHRC}"
 
 # !!! THIS HAS TO BE HERE EVEN IN THE NON-INTERACTIVE PART OR YOU WILL
 # LOSE YOU PREVIOUS HISTORY !!!
@@ -48,11 +48,13 @@ shopt -s histappend
 # interactive mode. This should maybe be done more properly through
 # using different .bash_profile and .bash_login
 
-[[ ${TERM} == "dumb" ]] || [ ! -t 0 ] && return
+[ ${TERM} == "dumb" ] || [[ ! -t 0 ]] && return
 
 # Remove the annoying beeps in console
 
-setterm -blength 0
+# setterm -blength 0
+
+# || setterm --blength 0 # Seriously?
 
 ######################################################################
 ## The interactive part
@@ -100,15 +102,15 @@ ulimit -c unlimited
 
 alias ..='cd ..'
 alias -- -='cd -'
-alias rm='rm -i'
-alias mv='mv -i'
-# alias chmod='chmod -v'
+alias rm='rm -v -i'
+alias mv='mv -v -i'
 alias chmod='chmod -c'
-alias cp='cp -i -v'
+alias cp='cp -v -i'
 alias rd=rmdir
 alias md='mkdir -pv'
 alias ps='ps uxaf'
-alias df='df -hT --sync'
+alias df='df -hT'
+# alias df='df -hT --sync'
 alias grep='grep -i -E --color=auto'
 alias find='ionice -c3 find'
 alias pd=pushd
@@ -122,7 +124,7 @@ function nh () {
 }
 
 function ding () {
-    if [[ $1 && $(which winshepherd.sh) ]]; then
+    if [[ $1 ]] && which winshepherd.sh; then
         play -q ~/local/sounds/deskbell.wav &
         unset E_APP_WINDOW
         winshepherd.sh message green "$1"
@@ -131,14 +133,9 @@ function ding () {
     fi
 }
 
-# alias kj="keyjnote -s -D 1000 -t Crossfade -T 100"
 alias impressive="impressive -s -D 1000 -t Crossfade -T 100"
 
-# alias fdupes='fdupes -r .'
-
-# ls colors
-
-if [ -e "${HOME}/.dircolors" ]; then
+if [[ -e "${HOME}/.dircolors" ]]; then
     eval $(dircolors "${HOME}/.dircolors")
     alias ls='ls -p --group-directories-first --color'
     alias lt='ls -p --color -gohtr --time-style="+%Y %b %d %H:%M"'
@@ -163,24 +160,19 @@ export GIT_EDITOR=${EDITOR}
 # export FIGNORE="CVS"
 
 function latexdiff () {
-    # wdiff -n \
-    # -w $'\033[30;43m'"[$1]"$'\033[30;41m ' -x $'\033[0m' \
-    # -y $'\033[30;43m'"[$2]"$'\033[30;42m ' -z $'\033[0m' \
-    # $*
-
     wdiff -n \
         -w $'\033[30;41m' -x $'\033[0m' \
         -y $'\033[30;42m' -z $'\033[0m' \
-        $*
-
-    # | \grep $'\033'"\|section{"
+        "$@"
 }
 
 # Looks for the most recent .log and pdflatex + bibtex the
 # corresponding tex file
 
 function rl () {
-    RECENT_LOG=$(ls -t $(find -maxdepth 1 -name "*.log" -type f) | head -1)
+    # RECENT_LOG=$(ls -t $(find -maxdepth 1 -name "*.log" -type f) | head -1)
+
+    RECENT_LOG=$(ls -t *.log | head -1)
 
     if [[ ${RECENT_LOG} ]]; then
         FILEBASE="${RECENT_LOG/.log/}"
@@ -192,10 +184,16 @@ function rl () {
             pdflatex "${FILEBASE}"
             pdflatex "${FILEBASE}"
 
-            if [[ "$1" == "--view" ]]; then
-                xpdf "${FILEBASE}.pdf"
-            elif [[ "$1" == "--print" ]]; then
-                lpr "${FILEBASE}.pdf"
+            if [[ "$1" ]]; then
+                if [[ "$1" == "-v" ]] || [[ "$1" == "--view" ]]; then
+                    xpdf "${FILEBASE}.pdf"
+                elif [[ "$1" == "-p" ]] || [[ "$1" == "--print" ]]; then
+                    lpr "${FILEBASE}.pdf"
+                else
+                    echo "Usage: rl [-v|--view] [-p|--print]" >&2
+                    echo "Unknown option $1" >&2
+                    return 1
+                fi
             fi
 
         else
@@ -215,6 +213,20 @@ function rl () {
 ######################################################################
 # Functions
 
+# http://www.reddit.com/r/linux/comments/2cgu5k/a_handy_little_script_for_interacting_with_your/
+function clip () {
+    if [[ -t 0 ]] && [[ -z "$1" ]]; then
+        # output contents of clipboard
+        xclip -out -selection clipboard || exit 1
+    elif [[ "$1" ]]; then
+        # copy file contents to clipboard
+        xclip -in -selection clipboard < "$1" || exit 1
+    else
+        # copy stdin to clipboard
+        xclip -in -selection clipboard <&0 || exit 1
+    fi
+}
+
 # Find a file whose name contains a substring
 
 function fn () {
@@ -230,6 +242,14 @@ function bak () {
     done
 }
 
+# A password generator
+
+function genpw () {
+    tr -dc A-Za-z0-9 < /dev/urandom | head -c16
+    # tr -dc [:graph:] < /dev/urandom | head -c16
+    echo
+}
+
 function ua () {
 
     [[ "$1" ]] || ( echo "Universal unarchive: ua <file> [<file> ...]" >&2 && return 1)
@@ -237,7 +257,6 @@ function ua () {
     while [[ "$1" ]]; do
 
         case "$1" in
-
             *.tgz|*.tar.gz|*.tbz|*.tar.bz2)
                 tar xvf "$1"
                 ;;
@@ -315,53 +334,13 @@ function trash () {
     mkdir -p ${TRASH}
 
     [[ -h ${LINK} ]] && \rm ${LINK}
+
     [[ ! -f ${LINK} ]] && ln -s ${TRASH} ${LINK}
 
     mv "$@" ${TRASH}
     echo "Trashed $@"
 }
 
-# alias trash=trash.sh
-
-function mmsget () {
-    mplayer "$1" -dumpstream -dumpfile $(basename "$1")
-}
-
-function quicktex () {
-    if [[ $1 ]]; then
-        MAIN=$1
-    else
-        MAIN=$(\ls -t *.tex | head -1 | sed -r -e 's/\.tex//')
-    fi
-    pdflatex ${MAIN}
-    bibtex ${MAIN}
-    pdflatex ${MAIN}
-    pdflatex ${MAIN}
-    xpdf ${MAIN}.pdf
-}
-
-######################################################################
-# http://www.reddit.com/r/linux/comments/akt3j/a_functional_programming_style_map_function_for/
-
-function map () {
-    local command i rep
-    if [ $# -lt 2 ] || [[ ! "$@" =~ :[[:space:]] ]];then
-        echo "Invalid syntax." >&2; return 1
-    fi
-    until [[ "$1" =~ : ]]; do
-        command="$command $1"; shift
-    done
-    command="$command ${1%:}"; shift
-    for i in "$@"; do
-        if [[ $command =~ \{\} ]];then
-            rep="${command//\{\}/\"$i\"}"
-            eval "${rep//\\/\\\\}"
-        else
-            eval "${command//\\/\\\\} \"${i//\\/\\\\}\""
-        fi
-    done
-}
-
 ######################################################################
 ## A version of pho which stores the image numbers in environment
 ## variables
@@ -384,25 +363,13 @@ function pho () {
     \rm ${TEMP}
 }
 
-# function rotjpeg () {
-# if [ "$1" == "90" ] || [ "$1" == "180" ] || [ "$1" == "270" ]; then
-# TEMP=$(mktemp /tmp/rotjpeg.XXXXXX)
-# echo jpegtran -rotate "$1" -copy all $2 > ${TEMP}
-# echo cp $2 ${2/jpg/}original.jpg
-# echo cp ${TEMP} $2
-# rm ${TEMP}
-# else
-# echo "Can not rotate with an angle of "$1" degrees."
-# fi
-# }
-
 ######################################################################
 ## A version of date that shows the time at home if TZ is set
 
 function dt () {
     echo "Local: $(date)"
     if [[ ${TZ} ]]; then
-        unset TZ
+        local TZ=$(cat /etc/timezone)
         echo "Home:  $(date)"
     fi
 }
@@ -416,20 +383,40 @@ function dt () {
 ## When invoked without an argument netdown removes the last interface
 ## which was netuped
 
-[[ ${NETUP_HISTORY} ]] || NETUP_HISTORY="${HOME}/.netup_history"
+[ ${NETUP_HISTORY} ] || NETUP_HISTORY="${HOME}/.netup_history"
 
 function netup () {
-    if [[ $(\ifconfig -s | grep -v ^"(Iface|lo) ") ]]; then
-        echo "There is already interface(s) up." >&2
+    local upped_wifi
+
+    [[ "${WIFI_INTERFACE}" ]] || WIFI_INTERFACE=wlan0
+
+    if [[ "$1" == "--scan" ]]; then
+        if ifconfig -s | grep -v -q ${WIFI_INTERFACE}; then
+            sudo ifconfig ${WIFI_INTERFACE} up
+            upped_wifi=1
+        fi
+
+        sudo iwlist ${WIFI_INTERFACE} scan | \grep -E 'ESS|Quali|Encry' | sed -e 's/^[ \t]*//'
+
+        if [[ ${upped_wifi} ]]; then
+            sudo ifconfig ${WIFI_INTERFACE} down
+            unset upped_wifi
+        fi
+
+        return 0
+    fi
+
+    if \ifconfig -s | grep -q -v ^'(Iface|lo) '; then
+        echo "There is/are already interface(s) up." >&2
         return 1
     fi
 
-    if [[ $(\ps -C dhclient | tail -n +2) ]]; then
+    if \ps h -C dhclient | grep -q .; then
         echo "There is already a dhcp client running." >&2
         return 1
     fi
 
-    if [[ $(\ps -C wpa_supplicant | tail -n +2) ]]; then
+    if \ps h -C wpa_supplicant | grep -q .; then
         echo "There is already a wpa_supplicant running." >&2
         return 1
     fi
@@ -445,7 +432,7 @@ function netup () {
         echo ${ARGS} > ${NETUP_HISTORY}
     fi
 
-    if [[ -n "${PRIVATE_INTERFACE_DEFINITION}" ]]; then
+    if [[ "${PRIVATE_INTERFACE_DEFINITION}" ]]; then
         ARGS="-i ${PRIVATE_INTERFACE_DEFINITION} ${ARGS}"
     fi
 
@@ -474,9 +461,7 @@ function netdown () {
         ARGS="$@"
     fi
 
-    if [[ -n "${PRIVATE_INTERFACE_DEFINITION}" ]]; then
-        ARGS="-i ${PRIVATE_INTERFACE_DEFINITION} ${ARGS}"
-    fi
+    [[ "${PRIVATE_INTERFACE_DEFINITION}" ]] && ARGS="-i ${PRIVATE_INTERFACE_DEFINITION} ${ARGS}"
 
     echo "Executing sudo ${VT_GREEN_FG}[ifdown ${ARGS}]${VT_RESET}"
     sudo ifdown ${ARGS}
@@ -494,7 +479,7 @@ function netdown () {
 
 function checkgw () {
     GW=$(route -n | grep ^0.0.0.0 | awk '{print $2}')
-    if [[ -n "${GW}" ]]; then
+    if [[ "${GW}" ]]; then
         ping ${GW}
     else
         echo "Can not find a getaway." >&2
@@ -513,12 +498,6 @@ function lr () {
         cut -b1-${WIDTH}
 }
 
-######################################################################
-# cd and ls into a directory
-# [from http://www.oreillynet.com/onlamp/blog/2007/01/whats_in_your_bash_history.html]
-
-# function c () { cd "$@" && lr; }
-
 ######################################################################
 # You can change the xterm background color on the fly!
 
@@ -542,10 +521,21 @@ KEPT_COMMANDS=${HOME}/.kept_bash_commands
 
 function keep () {
     if [[ ${KEPT_COMMANDS} ]]; then
-        LINE="$*"
-        [[ "${LINE}" ]] || LINE=$(history | tail -2 | head -1 | sed -e "s/^[0-9 ]*//")
-        echo $LINE
-        echo $(date)": "${LINE} >> ${KEPT_COMMANDS}
+        TOKEEP=$(mktemp /tmp/keep.XXXXXX)
+        if [[ "$@" ]]; then
+            echo "$@" > ${TOKEEP}
+        else
+            selector -b -i -d -l ${HISTSIZE} -o "${TOKEEP}" <(history)
+        fi
+
+        if [[ -s "${TOKEEP}" ]]; then
+            echo $(date)": "$(cat ${TOKEEP}) >> ${KEPT_COMMANDS}
+            cat "${TOKEEP}"
+        else
+            echo "No command stored!"
+        fi
+
+        \rm ${TOKEEP}
     else
         echo "You have to set \$KEPT_COMMANDS"
     fi
@@ -555,21 +545,21 @@ function keep () {
 # I sometime burn CDs and DVDs
 
 function burn () {
-    DEVICE="/dev/cdrw"
+    [[ "${DEV_BURNER}" ]] || DEV_BURNER="/dev/sr0"
     if [[ ! "$1" ]]; then
         echo "burn <iso name | dirname>" >&2
     elif [[ -f "$1" ]]; then
-        if [[ $(file "$1" | grep "ISO 9660") ]]; then
-            wodim -eject -v dev=${DEVICE} "$1"
+        if [[ $(file "$1" | \grep -E 'ISO 9660|UDF filesystem data') ]]; then
+            wodim -eject -v dev=${DEV_BURNER} "$1"
         else
-            echo "Unknown type of $1" >&2
+            echo "Do not know what to do with $1" >&2
         fi
     elif [[ -d "$1" ]]; then
         [[ "${TMP_ROOT}" ]] || TMP_ROOT=/tmp/
         echo "Using ${TMP_ROOT} as temporary directory."
         TMP=$(mktemp ${TMP_ROOT}/cdimage.XXXXXX) && \
             genisoimage -input-charset iso8859-1 -r -o ${TMP} "$1" && \
-            wodim -eject -v dev=${DEVICE} ${TMP}
+            wodim -eject -v dev=${DEV_BURNER} ${TMP}
         rm -f ${TMP}
     else
         echo "Can not find $1" >&2
@@ -610,7 +600,7 @@ function dvd () {
         -quiet \
         -alang en -slang en \
         -softvol -softvol-max 1000 \
-        -dvd-device ${dvd_device} $* dvd://${title}
+        -dvd-device ${dvd_device} ${MPLAYER_OPTIONS} dvd://${title}
 }
 
 function ripdvd () {
@@ -628,33 +618,23 @@ function ripdvd () {
     mkdir -p ${HOME}/dvds
 
     cd ${HOME}/dvds
-    time dvdbackup -i ${DVD_DEVICE} -v -M $* && eject
+    time dvdbackup -i ${DVD_DEVICE} -v -M "$@" && eject
 }
 
 alias ripcd=abcde
 
-######################################################################
-# Upload the sources from the current directory to work
-
-function ulsrc () {
-    if [[ ! "${MY_WORK_MACHINE}" ]]; then
-        echo "\$MY_WORK_MACHINE undefined" 1>&2
-        return 1
-    fi
-
-    DIR=${PWD/$HOME\//}
-
-    scp {Makefile,*.{cc,h,sh}} ${MY_WORK_MACHINE}:${DIR}
-
-    echo "Uploaded to ${MY_WORK_MACHINE}:${DIR}/"
-}
-
 ######################################################################
 # Create small images from images
 
 function mksmall () {
 
-    PARAMS="-geometry 800x600"
+    if [[ "$1" == "--params" ]]; then
+        shift
+        PARAMS="$1"
+        shift
+    fi
+
+    [[ "${PARAMS}" ]] || PARAMS="-geometry 1280x1024"
 
     # Auto-orient does not seem to work at all, hence the ugly hack
     # with exif below
@@ -682,32 +662,6 @@ function mksmall () {
             if [[ -e ${DEST_DIR}/$i ]]; then
                 echo "The file ${DEST_DIR}/$i already exists."
             else
-
-                # orientation=$(exif $i \
-                # | grep ^Orientation \
-                # | head -1 \
-                # | sed -e "s/^[^|]*|//" \
-                # | sed -e "s/ *$//")
-
-                # case ${orientation} in
-                # ""|"top - left")
-                # rotation_cmd=""
-                # ;;
-
-                # "right - top")
-                # rotation_cmd="-rotate 90"
-                # ;;
-
-                # "left - bottom")
-                # rotation_cmd="-rotate 270"
-                # ;;
-
-                # *)
-                # rotation_cmd=""
-                # echo "Unknown orientation \"${orientation}\" !"
-                # ;;
-                # esac
-
                 if [[ $(file ${i/%.*/}.* | grep -E movie) ]] ; then
                     CAPTION_PARAMS="-font FreeSans-Bold -pointsize 32 -fill green -annotate +10+32 Video"
                 else
@@ -741,82 +695,12 @@ function mvtoconfig () {
     fi
 }
 
-######################################################################
-# Track uncommited files (I presume this is very ugly from a real git
-# user perspective)
-
-function git-fm () {
-    CURRENT_DIR=$(pwd)
-    NB_SUBDIR=0
-
-    for i in $(find -name ".git"); do
-        NB_SUBDIR=$((NB_SUBDIR+1))
-        cd ${CURRENT_DIR}/$(dirname $i)
-        NB_MODIFIED=$(git status | grep modified | wc -l)
-        if [[ ${NB_MODIFIED} -gt 0 ]]; then
-            echo "$(dirname $i) (${NB_MODIFIED})"
-            git status | grep modified \
-                | sed -e "s/^#\t/    /" | sed -e "s/modified: *//"
-        fi
-    done
-
-    cd ${CURRENT_DIR}
-
-    echo "Visited ${NB_SUBDIR} directories."
-}
-
-function vcup () {
-    if [[ "$1" ]]; then
-        CURRENT=${PWD}
-        while [[ "$1" ]]; do
-            cd ${CURRENT}
-            cd $1
-            if [[ -d ".git" ]]; then
-                echo "${PWD} is under GIT"
-                git pull
-            elif [[ -d ".svn" ]]; then
-                echo "${PWD} is under SVN"
-                svn update
-            else
-                echo "No known versioning system."
-            fi
-            shift
-        done
-        cd ${CURRENT}
-    else
-        vcup .
-    fi
-}
-
-######################################################################
-# Downloads torrents located in ${BT_DIR}/torrents/ and puts the
-# result in the ${BT_DIR}
-
-function bt () {
-    if [[ ${BT_DIR} ]]; then
-        if [[ -d "${BT_DIR}/torrents" ]]; then
-            if [[ "$1" ]]; then
-                mv "$1" ${BT_DIR}/torrents
-            fi
-            if [[ "$(ps auxwww | grep btlaunchmanycurses | grep -v grep)" ]]; then
-                echo "A client is already running."
-            else
-                cd ${BT_DIR} && screen btlaunchmanycurses torrents --max_upload_rate 32
-            fi
-        else
-            echo "Directory ${BT_DIR}/torrents does not exist."
-        fi
-    else
-        echo "You have to set \$BT_DIR."
-    fi
-}
-
 ######################################################################
 # The complex prompt policy
 
 export PS1
 
-if [ "${CONSOLE}" == "yes" ]; then
+if [[ "${CONSOLE}" == "yes" ]]; then
     PS1=""
 else
 
@@ -824,38 +708,32 @@ else
     # IGNORED_PROMPT_LOGIN, which is set in the private bash file), do not
     # show it. I have IGNORED_PROMPT_LOGIN="^fleuret$".
 
-    if [ ! ${IGNORED_PROMPT_LOGIN} ] || [[ ! ${USER} =~ ${IGNORED_PROMPT_LOGIN} ]]; then
+    if [[ ! ${IGNORED_PROMPT_LOGIN} ]] || [[ ! ${USER} =~ ${IGNORED_PROMPT_LOGIN} ]]; then
         IDENT="${USER}"
     fi
 
     # If the display is not the main one, make the assumption that the
     # shell is not running on the localhost, and show the hostname
 
-    [ "${DISPLAY}" != ":0.0" ] && IDENT="${IDENT}@\h"
+    [[ "${DISPLAY}" != ":0.0" ]] && IDENT="${IDENT}@\h"
 
     # If there is the login or the hostname, add a ":" to the prompt
 
-    [ "${IDENT}" ] && IDENT="${IDENT}:"
-
-    # If we are root, show that in red
+    [[ "${IDENT}" ]] && IDENT="${IDENT}:"
 
     if [[ ${USER} == "root" ]]; then
+        # If we are root, show that in red
         PS1="\[${VT_RED_BG}${VT_WHITE_FG}\]${IDENT}\w\[${VT_RESET}\] "
     else
-        PS1="\[${VT_WHITE_BG}${VT_BLACK_FG}\]${IDENT}\w\[${VT_RESET}\] "
+        if [[ $(\grep QEMU /proc/cpuinfo) ]]; then
+            # If we are in a qemu virtual machine, in yellow
+            PS1="\[${VT_YELLOW_BG}${VT_BLACK_FG}\]${IDENT}\w\[${VT_RESET}\] "
+        else
+            # Otherwise in white
+            PS1="\[${VT_WHITE_BG}${VT_BLACK_FG}\]${IDENT}\w\[${VT_RESET}\] "
+        fi
     fi
 
-    # In an xterm, show the hostname and path in the title bar, highlight
-    # the prompt
-
-    # [ "${TERMS_WITH_BAR}" ] || TERMS_WITH_BAR="^xterm|screen$"
-
-    # if [[ "${TERM}" =~ "${TERMS_WITH_BAR}" ]]; then
-    # PS1="\[${VT_SET_TITLE}shell@\h (\w)${VT_END_TITLE}${VT_WHITE_BG}\]${IDENT}\w\[${VT_RESET}\] "
-    # else
-    # PS1="\[${VT_WHITE_BG}\]${IDENT}\w\[${VT_RESET}\] "
-    # fi
-
 fi
 
 ######################################################################
@@ -883,7 +761,7 @@ function keep_local_history () {
 PS1="\[${VT_WHITE_BG}\]\${LOCAL_HISTORY_HINT}\[${VT_RESET}\]${PS1}"
 
 ######################################################################
-# Switch off the history
+# Show the history path if it is unusual
 
 function histfile_cue () {
     if [[ ! "${HISTFILE}" == "${HOME}/.bash_history" ]]; then
@@ -914,6 +792,8 @@ alias finddup='finddup -p'
 #
 # git clone http://fleuret.org/git/selector/
 
+export SELECTOR_CD_HISTORY_SIZE=10000
+
 source bash-selector.sh --hist --cd
 
 ######################################################################
@@ -938,29 +818,73 @@ function selector-printer () {
 # the current directory
 
 function lsn () {
-    LSN_MEMORY=".lsn-state"
+    [[ "${LSN_STATE_FILE}" ]] || LSN_STATE_FILE=".lsn-state"
+
     if  [[ $1 == "--mem" ]] || [[ "$1" == "-m" ]]; then
-        \ls -pa | sort > ${LSN_MEMORY}
+
+        \ls -pa | sort > "${LSN_STATE_FILE}"
         echo "State updated." >&2
-    elif [[ -n "$1" ]]; then
-        echo "lsn [--mem|-m]" >&2
-        return 1
+
+    elif [[ $1 == "+" ]]; then
+
+        shift
+
+        TMP=$(mktemp /tmp/lsn.XXXXXX)
+        \ls -d "$@" > ${TMP}
+        cat "${LSN_STATE_FILE}" >> ${TMP}
+        sort ${TMP} | uniq -u > "${LSN_STATE_FILE}"
+        \rm ${TMP}
+
+    elif [[ "$1" ]]; then
+        cat >&2 <<EOF
+lsn [--help|-h] [--mem|-m] [+ <file> ...]
+
+Where
+
+  --help|-h
+     prints this help
+
+  --mem|-m
+     stores the current state of the directory
+
+  + <file> [<file> ...]
+     switches the presence/absence of the indicated files in the
+     stored state
+
+EOF
+        if [[ ! "$1" == "-h" ]] && [[ ! "$1" == "--help" ]]; then
+            echo >&2 "Unknown option \`\`$1''."
+            return 1
+        fi
+
     else
-        if [[ -f ${LSN_MEMORY} ]]; then
-            comm -1 -3 ${LSN_MEMORY} <(\ls -pa | sort)
-            comm -2 -3 ${LSN_MEMORY} <(\ls -pa | sort) | while read line; do
-                echo "${VT_RED_FG}${VT_BOLD}${line}${VT_RESET} (missing)"
-            done
+
+        if [[ -f "${LSN_STATE_FILE}" ]]; then
+            TMP=$(mktemp /tmp/lsn.XXXXXX)
+            \ls -pa | sort > ${TMP}
+            if diff > /dev/null ${TMP} "${LSN_STATE_FILE}"; then
+                echo "${VT_GREEN_FG}${VT_BOLD}No change (since $(date +"%b %d, %Y" -r "${LSN_STATE_FILE}"))${VT_RESET}"
+            else
+                \comm -1 -3 "${LSN_STATE_FILE}" ${TMP}
+                \comm -2 -3 "${LSN_STATE_FILE}" ${TMP} | while read line; do
+                    echo "${VT_RED_FG}${VT_BOLD}${line}${VT_RESET} (missing)"
+                done
+            fi
+            \rm ${TMP}
         else
-            echo "No lsn state here." >&2
+            echo "${VT_RED_FG}${VT_BOLD}No lsn state here.${VT_RESET}" >&2
             return 1
         fi
+
     fi
 }
 
 ######################################################################
 
 function prompt_command () {
+    # if [[ $(umask) != 0022 ]]; then
+        # echo "Umask changed to $(umask)"
+    # fi
     # save the history after every command to avoid loosing some when
     # multiple shells are open
     history -a
@@ -978,8 +902,6 @@ PROMPT_COMMAND="prompt_command"
 
 # Displaying the timezone if it is set
 
-if [[ ${TZ} ]]; then
-    echo "${VT_BOLD}${VT_GREEN_FG}Time zone is ${TZ}.${VT_RESET}"
-fi
+[[ ${TZ} ]] && echo "${VT_BLUE_FG}Time zone is ${TZ}.${VT_RESET}"
 
 ######################################################################