Bash: replace the former output with the new one

[kiyop]

I will check https://github.com/hakerdefo/pmrp

[kiyop]

I read https://github.com/hakerdefo/pmrp/blob/master/pmrp
The above displays all the titles of the played radio stream including the old ones, doesn't it?

You may be able to shrink the script by using arrays. For example,
lines from #138 to #264 may be able to be replaced with the following:

Code: Select all

function UrbaN_181fM (){

Name=("Jammin 181" "Old School HipHop" "The Beat" "The Box" "Trinity" "True R&B")

link=("http://relay.181.fm:8042" "http://relay.181.fm:8068" "http://relay.181.fm:8054" "http://relay.181.fm:8024" "http://icyrelay.181.fm/181-trinityhiphop_128k.mp3" "http://relay.181.fm:8022")

clear

echo -e "Stations Playing $BLUE Urban Music $NC :"
echo ""
for i in 1 2 3 4 5 6
do
echo -e "$BLUE 0$i $NC ${Name[$[i-1]]}"
done
echo -e "$RED 07 $BLUE Return to 181FM Menu $NC"
echo ""
echo -e "Select a $BLUE station $NC between 1 to 6 and hit $BLUE [Enter] $NC to $BLUE PLAY $NC :"

read PLAY
if test "$PLAY" -ge 1 -a "$PLAY" -le 6 2>/dev/null
then
clear
echo -e "$BLUE PMRP $NC -> $BLUE 181FM $NC -> $BLUE Urban $NC -> $BLUE ${Name[$[i-1]]} $NC:"
echo ""
echo -e "Press $BLUE [Space] $NC to pause : Press $BLUE [Q] $NC to stop"
echo ""
echo ""
echo -e "$BLUE Playlist $NC:"
echo ""
$PLAYER "${link[$[i-1]]}" 2>&1 /dev/null | grep --line-buffered "StreamTitle" | sed -e 's/;.*//' -e 's/.*=//' -e "s/'//g"
UrbaN_181fM
elif [ "$PLAY" = 7 ]
then
clear
181fM
fi
clear
echo ""
echo -e "$RED $PLAY $NC $BLUE is an invalid selection! $NC"
echo ""
sleep 3
UrbaN_181fM
} 

You can also use "dialog" for selector.
You can install dialog by executing the following with root privilege:

Code: Select all

apt-get install dialog

And you can read manual of dialog:

Code: Select all

man dialog

[hakerdefo]

I read https://github.com/hakerdefo/pmrp/blob/master/pmrp
The above displays all the titles of the played radio stream including the old ones, doesn't it?

Yes, it does.
And thanks for the great tip. That tip not only shrinks the script but makes it more readable and easier to understand.
Cheers!!!

[HarborView]

This works because xterm takes ANSI positioning codes.
See:
http://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html

Code: Select all

#!/bin/bash
x="Now is the time*for all good men*to come to the aid*of their country"
IFS="*"
X=($x)
clear
for ((k=0; k<4; k++)); do 
  echo ${X[k]}
  sleep 1
done
echo

MoveUp=`echo -e "\033[1A"`
ClearLine=`echo -e "\033[K"`
echo "Press ENTER for the 2nd part"
read
echo
echo
for ((k=0; k<4; k++)); do 
  echo -n $MoveUp$ClearLine
  echo ${X[k]}
  sleep 1
done

[kiyop]

Thank you for telling ANSI positioning codes
The former script of mine which does not display unnecessary output can be shrink a little bit:

Code: Select all

refreshsecond=1
ao=""
mpg123 http://streaming.radionomy.com/-1ClassicRock 2>&1 /dev/null | grep "StreamTitle" | cut -d \' -f2 > temporarylogfile &
pid=$!
echo -ne "\033[s"
while [ -n "$(ps a|grep "^ *$pid ")" ];do
a=$(tail -n1 temporarylogfile)
if [ ! "$a" = "$ao" ];then echo -ne  "\033[u\033[K$a";ao=$a;fi
echo $a > temporarylogfile # can be omitted
sleep $refreshsecond
done
rm -r temporarylogfile