sh sudo string parameter












2














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







share|improve this question









New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 1




    Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
    – Thomas Ward♦
    5 hours ago










  • What are you trying to do with that music[0], is that an array?
    – George Udosen
    5 hours ago












  • i want to feed in that star_wars.wav file into -r so i can change it when it finishes
    – Burgerl X
    5 hours ago


















2














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







share|improve this question









New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 1




    Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
    – Thomas Ward♦
    5 hours ago










  • What are you trying to do with that music[0], is that an array?
    – George Udosen
    5 hours ago












  • i want to feed in that star_wars.wav file into -r so i can change it when it finishes
    – Burgerl X
    5 hours ago
















2












2








2







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







share|improve this question









New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











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






share|improve this question









New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 55 mins ago









Zanna

50.1k13131240




50.1k13131240






New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 5 hours ago









Burgerl X

111




111




New contributor




Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Burgerl X is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 1




    Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
    – Thomas Ward♦
    5 hours ago










  • What are you trying to do with that music[0], is that an array?
    – George Udosen
    5 hours ago












  • i want to feed in that star_wars.wav file into -r so i can change it when it finishes
    – Burgerl X
    5 hours ago
















  • 1




    Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
    – Thomas Ward♦
    5 hours ago










  • What are you trying to do with that music[0], is that an array?
    – George Udosen
    5 hours ago












  • i want to feed in that star_wars.wav file into -r so i can change it when it finishes
    – Burgerl X
    5 hours ago










1




1




Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
– Thomas Ward♦
5 hours ago




Is this a Bash script or a strictly sh script? Arrays are a Bash thing.
– Thomas Ward♦
5 hours ago












What are you trying to do with that music[0], is that an array?
– George Udosen
5 hours ago






What are you trying to do with that music[0], is that an array?
– George Udosen
5 hours ago














i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
5 hours ago






i want to feed in that star_wars.wav file into -r so i can change it when it finishes
– Burgerl X
5 hours ago












1 Answer
1






active

oldest

votes


















5














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]).






share|improve this answer























  • 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
    5 hours ago












  • i want to use an array so i can switch songs when they ended
    – Burgerl X
    5 hours ago










  • If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
    – Arronical
    5 hours ago










  • + it says that musics[0] is not found and i an using bash
    – Burgerl X
    5 hours ago












  • 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
    5 hours ago











Your Answer








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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









5














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]).






share|improve this answer























  • 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
    5 hours ago












  • i want to use an array so i can switch songs when they ended
    – Burgerl X
    5 hours ago










  • If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
    – Arronical
    5 hours ago










  • + it says that musics[0] is not found and i an using bash
    – Burgerl X
    5 hours ago












  • 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
    5 hours ago
















5














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]).






share|improve this answer























  • 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
    5 hours ago












  • i want to use an array so i can switch songs when they ended
    – Burgerl X
    5 hours ago










  • If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
    – Arronical
    5 hours ago










  • + it says that musics[0] is not found and i an using bash
    – Burgerl X
    5 hours ago












  • 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
    5 hours ago














5












5








5






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]).






share|improve this answer














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]).







share|improve this answer














share|improve this answer



share|improve this answer








edited 5 hours ago

























answered 5 hours ago









Arronical

13.1k84790




13.1k84790












  • 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
    5 hours ago












  • i want to use an array so i can switch songs when they ended
    – Burgerl X
    5 hours ago










  • If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
    – Arronical
    5 hours ago










  • + it says that musics[0] is not found and i an using bash
    – Burgerl X
    5 hours ago












  • 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
    5 hours ago


















  • 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
    5 hours ago












  • i want to use an array so i can switch songs when they ended
    – Burgerl X
    5 hours ago










  • If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
    – Arronical
    5 hours ago










  • + it says that musics[0] is not found and i an using bash
    – Burgerl X
    5 hours ago












  • 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
    5 hours ago
















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
5 hours ago






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
5 hours ago














i want to use an array so i can switch songs when they ended
– Burgerl X
5 hours ago




i want to use an array so i can switch songs when they ended
– Burgerl X
5 hours ago












If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
5 hours ago




If there are spaces around the = in the first line, the variable won't be assigned. Are you using the Bash shell?
– Arronical
5 hours ago












+ it says that musics[0] is not found and i an using bash
– Burgerl X
5 hours ago






+ it says that musics[0] is not found and i an using bash
– Burgerl X
5 hours ago














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
5 hours ago




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
5 hours ago










Burgerl X is a new contributor. Be nice, and check out our Code of Conduct.










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Burgerl X is a new contributor. Be nice, and check out our Code of Conduct.












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