sh sudo string parameter
I'm playing with my Raspberry Pi Zero, and I'm trying to automate an FM transmitter script.
You can run the script with sudo fm_transmitter -f [frequency] -r [.wav music file]
For example:
sudo fm_transmitter -f 103 -r star_wars.wav
My code:
musics[0] = "/home/pi/radio/fm/star_wars.wav"
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r musics[0]
It gives me an error because it can't find musics[0].
What could be the problem here?
command-line sudo sh
edited Jan 3 at 19:16
Zanna
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
add a comment |
I'm playing with my Raspberry Pi Zero, and I'm trying to automate an FM transmitter script.
You can run the script with sudo fm_transmitter -f [frequency] -r [.wav music file]
For example:
sudo fm_transmitter -f 103 -r star_wars.wav
My code:
musics[0] = "/home/pi/radio/fm/star_wars.wav"
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r musics[0]
It gives me an error because it can't find musics[0].
What could be the problem here?
command-line sudo sh
edited Jan 3 at 19:16
Zanna
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
1
Is this a Bash script or a strictlyshscript? Arrays are a Bash thing.
– Thomas Ward♦
Jan 3 at 14:22
What are you trying to do with thatmusic[0], is that an array?
– George Udosen
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23
add a comment |
I'm playing with my Raspberry Pi Zero, and I'm trying to automate an FM transmitter script.
You can run the script with sudo fm_transmitter -f [frequency] -r [.wav music file]
For example:
sudo fm_transmitter -f 103 -r star_wars.wav
My code:
musics[0] = "/home/pi/radio/fm/star_wars.wav"
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r musics[0]
It gives me an error because it can't find musics[0].
What could be the problem here?
command-line sudo sh
edited Jan 3 at 19:16
Zanna
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
I'm playing with my Raspberry Pi Zero, and I'm trying to automate an FM transmitter script.
You can run the script with sudo fm_transmitter -f [frequency] -r [.wav music file]
For example:
sudo fm_transmitter -f 103 -r star_wars.wav
My code:
musics[0] = "/home/pi/radio/fm/star_wars.wav"
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r musics[0]
It gives me an error because it can't find musics[0].
What could be the problem here?
command-line sudo sh
command-line sudo sh
edited Jan 3 at 19:16
Zanna
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
edited Jan 3 at 19:16
Zanna
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
edited Jan 3 at 19:16
Zanna
51.2k13139243
edited Jan 3 at 19:16
Zanna
51.2k13139243
edited Jan 3 at 19:16
Zanna
51.2k13139243
51.2k13139243
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
asked Jan 3 at 14:17
Burgerl XBurgerl X
132
132
1
Is this a Bash script or a strictlyshscript? Arrays are a Bash thing.
– Thomas Ward♦
Jan 3 at 14:22
What are you trying to do with thatmusic[0], is that an array?
– George Udosen
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23
add a comment |
1
Is this a Bash script or a strictlyshscript? Arrays are a Bash thing.
– Thomas Ward♦
Jan 3 at 14:22
What are you trying to do with thatmusic[0], is that an array?
– George Udosen
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23
1
1
Is this a Bash script or a strictly
sh script? Arrays are a Bash thing.– Thomas Ward♦
Jan 3 at 14:22
Is this a Bash script or a strictly
sh script? Arrays are a Bash thing.– Thomas Ward♦
Jan 3 at 14:22
What are you trying to do with that
music[0], is that an array?– George Udosen
Jan 3 at 14:23
What are you trying to do with that
music[0], is that an array?– George Udosen
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23
add a comment |
1 Answer
1
active
oldest
votes
You've set the first element of an array as /home/pi/radio/fm/star_wars.wav with the line:
musics[0]="/home/pi/radio/fm/star_wars.wav"
To access the contents, you need to expand that array element using $ like so:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "${musics[0]}"
The quotes "" are used to preserve the format of the output, and the braces {} are part of expanding an array variable.
It's not clear why you're using an array here, when a standard variable would work. You could replace:
musics[0]="/home/pi/radio/fm/star_wars.wav"
with
musics="/home/pi/radio/fm/star_wars.wav"
and the line using that variable changes to:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "$musics"
This is much simpler as you don't need to use index numbers (the part referred to by [0]).
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
i triedecho "${musics[0]}"and adding it into the sudo method, but it just says it cant find musics[0](even the echo)
– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the=in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the=, if it says it can't findmusics[0]then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into thesudo fm_transmitter ...command.
– Arronical
Jan 3 at 14:54
|
show 5 more comments
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1 Answer
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votes
You've set the first element of an array as /home/pi/radio/fm/star_wars.wav with the line:
musics[0]="/home/pi/radio/fm/star_wars.wav"
To access the contents, you need to expand that array element using $ like so:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "${musics[0]}"
The quotes "" are used to preserve the format of the output, and the braces {} are part of expanding an array variable.
It's not clear why you're using an array here, when a standard variable would work. You could replace:
musics[0]="/home/pi/radio/fm/star_wars.wav"
with
musics="/home/pi/radio/fm/star_wars.wav"
and the line using that variable changes to:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "$musics"
This is much simpler as you don't need to use index numbers (the part referred to by [0]).
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
i triedecho "${musics[0]}"and adding it into the sudo method, but it just says it cant find musics[0](even the echo)
– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the=in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the=, if it says it can't findmusics[0]then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into thesudo fm_transmitter ...command.
– Arronical
Jan 3 at 14:54
|
show 5 more comments
You've set the first element of an array as /home/pi/radio/fm/star_wars.wav with the line:
musics[0]="/home/pi/radio/fm/star_wars.wav"
To access the contents, you need to expand that array element using $ like so:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "${musics[0]}"
The quotes "" are used to preserve the format of the output, and the braces {} are part of expanding an array variable.
It's not clear why you're using an array here, when a standard variable would work. You could replace:
musics[0]="/home/pi/radio/fm/star_wars.wav"
with
musics="/home/pi/radio/fm/star_wars.wav"
and the line using that variable changes to:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "$musics"
This is much simpler as you don't need to use index numbers (the part referred to by [0]).
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
i triedecho "${musics[0]}"and adding it into the sudo method, but it just says it cant find musics[0](even the echo)
– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the=in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the=, if it says it can't findmusics[0]then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into thesudo fm_transmitter ...command.
– Arronical
Jan 3 at 14:54
|
show 5 more comments
You've set the first element of an array as /home/pi/radio/fm/star_wars.wav with the line:
musics[0]="/home/pi/radio/fm/star_wars.wav"
To access the contents, you need to expand that array element using $ like so:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "${musics[0]}"
The quotes "" are used to preserve the format of the output, and the braces {} are part of expanding an array variable.
It's not clear why you're using an array here, when a standard variable would work. You could replace:
musics[0]="/home/pi/radio/fm/star_wars.wav"
with
musics="/home/pi/radio/fm/star_wars.wav"
and the line using that variable changes to:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "$musics"
This is much simpler as you don't need to use index numbers (the part referred to by [0]).
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
You've set the first element of an array as /home/pi/radio/fm/star_wars.wav with the line:
musics[0]="/home/pi/radio/fm/star_wars.wav"
To access the contents, you need to expand that array element using $ like so:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "${musics[0]}"
The quotes "" are used to preserve the format of the output, and the braces {} are part of expanding an array variable.
It's not clear why you're using an array here, when a standard variable would work. You could replace:
musics[0]="/home/pi/radio/fm/star_wars.wav"
with
musics="/home/pi/radio/fm/star_wars.wav"
and the line using that variable changes to:
sudo /home/pi/radio/fm/fm_transmitter -f 103 -r "$musics"
This is much simpler as you don't need to use index numbers (the part referred to by [0]).
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
edited Jan 3 at 14:31
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
answered Jan 3 at 14:24
ArronicalArronical
13.7k84993
13.7k84993
i triedecho "${musics[0]}"and adding it into the sudo method, but it just says it cant find musics[0](even the echo)
– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the=in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the=, if it says it can't findmusics[0]then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into thesudo fm_transmitter ...command.
– Arronical
Jan 3 at 14:54
|
show 5 more comments
i triedecho "${musics[0]}"and adding it into the sudo method, but it just says it cant find musics[0](even the echo)
– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the=in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the=, if it says it can't findmusics[0]then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into thesudo fm_transmitter ...command.
– Arronical
Jan 3 at 14:54
i tried
echo "${musics[0]}" and adding it into the sudo method, but it just says it cant find musics[0](even the echo)– Burgerl X
Jan 3 at 14:30
i tried
echo "${musics[0]}" and adding it into the sudo method, but it just says it cant find musics[0](even the echo)– Burgerl X
Jan 3 at 14:30
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
i want to use an array so i can switch songs when they ended
– Burgerl X
Jan 3 at 14:32
If there are spaces around the
= in the first line, the variable won't be assigned. Are you using the Bash shell?– Arronical
Jan 3 at 14:32
If there are spaces around the
= in the first line, the variable won't be assigned. Are you using the Bash shell?– Arronical
Jan 3 at 14:32
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
+ it says that musics[0] is not found and i an using bash
– Burgerl X
Jan 3 at 14:46
Make sure there are no spaces around the
=, if it says it can't find musics[0] then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into the sudo fm_transmitter ... command.– Arronical
Jan 3 at 14:54
Make sure there are no spaces around the
=, if it says it can't find musics[0] then it is trying to find the literal string 'musics[0]', which means that you're not trying to expand the variable at all. There is no need to add an echo command into the sudo fm_transmitter ... command.– Arronical
Jan 3 at 14:54
|
show 5 more comments
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1
Is this a Bash script or a strictly
shscript? Arrays are a Bash thing.– Thomas Ward♦
Jan 3 at 14:22
What are you trying to do with that
music[0], is that an array?– George Udosen
Jan 3 at 14:23
i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
Jan 3 at 14:23