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back.sh

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+#!/bin/bash
+# back # back from cdm and upm # r2017-02-01 fr2017-02-01
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias back=". PATH/back.sh"
+if [ "$MPWD" == "" ]; then LIMIT=0; fi
+LIMIT="$1"
+if [ "$LIMIT" == "" ]; then LIMIT=1; fi
+P="$MPWD"
+# echo -n "cd from $P "
+for ((i=1; i <= LIMIT; i++))
+do
+P="${P%/..}"
+done
+# echo "to $P"
+cd "$P"
+export MPWD="$P"

cdm.sh

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+#!/bin/bash
+# cdm # change directory (and back) # r2017-02-01 fr2017-02-01
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias cdm=". PATH/cdm.sh"
+# echo "cd from $P to $1"
+export MPWD="$PWD"
+cd "$1"

dirm.sh

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+#!/bin/bash
+# dirm # memorize directory (to get back) # r2019-09-21 fr2017-02-01
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias dirm=". PATH/dirm.sh"
+# echo "directory to remember: $1"
+if [ -z "$1" ]; then
+export MPWD="$PWD"
+else
+export MPWD="$1"
+fi

ldirm.sh

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+#!/bin/bash
+# ldirm # list memorized directory # r2019-09-21 fr2019-09-21
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias ldirm=". PATH/ldirm.sh"
+if [ "$MPWD" ]; then
+ls -laF --group-directories-first --color=auto "$MPWD"
+else
+ls -laF --group-directories-first --color=auto
+fi

showdirm.sh

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+#!/bin/bash
+# showdirm # echo memorized directory # r2019-09-21 fr2019-09-21
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias showdirm=". PATH/showdirm.sh"
+if [ "$MPWD" ]; then
+echo "$MPWD"
+else
+echo ""
+fi

up.sh

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+#!/bin/bash
+# up # up one directory # r2017-02-01 fr2017-02-01
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias up=". PATH/up.sh"
+LIMIT="$1"
+if [ "$LIMIT" == "" ]; then LIMIT=1; fi
+if [ "$LIMIT" -lt 0 ]; then LIMIT=0; fi
+P="$PWD"
+if [ "$P" == "/" ]; then LIMIT=0; fi
+# echo -n "cd from $P "
+for ((i=1; i <= LIMIT; i++))
+do
+P=`echo -n "$P" | rev | cut -d "/" -f2- | rev`
+# P="$P/.." # alternative method
+done
+if [ "$P" == "" ]; then P="/"; fi
+# echo "to $P"
+cd "$P"
+# export MPWD="$P"

upm.sh

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+#!/bin/bash
+# upm # up one directory (and back) # r2017-02-01 fr2017-02-01
+# by Valerio Capello - http://labs.geody.com/ - GPL
+# alias upm=". PATH/upm.sh"
+LIMIT="$1"
+if [ "$LIMIT" == "" ]; then LIMIT=1; fi
+if [ "$LIMIT" -lt 0 ]; then LIMIT=0; fi
+P="$PWD"
+if [ "$P" == "/" ]; then LIMIT=0; fi
+# echo -n "cd from $P "
+for ((i=1; i <= LIMIT; i++))
+do
+# P=`echo -n "$P" | rev | cut -d "/" -f2- | rev` # this won't work with back
+P="$P/.."
+done
+if [ "$P" == "" ]; then P="/"; fi
+# echo "to $P"
+cd "$P"
+export MPWD="$P"