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








StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});






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










draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1106594%2fsh-sudo-string-parameter%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























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.










draft saved

draft discarded


















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













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












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
















Thanks for contributing an answer to Ask Ubuntu!


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.





Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


Please pay close attention to the following guidance:


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1106594%2fsh-sudo-string-parameter%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







-

Popular posts from this blog

Understanding the information contained in the Deep Space Network XML data?

Image
up vote 1 down vote favorite NASA's Deep Space Network activity can be viewed conveniently at https://eyes.nasa.gov/dsn/dsn.html but if you would like data in a more raw XML form, it can be accessed as described in this answer Below is a small Python script that reads the XML into a list of dictionaries, and saves it to disk as a JSON. The dictionaries are organized at the higher level by dish, then by spacecraft per dish. Question: What are the most-likely meanings of all the data field contained in the Deep Space Network XML data? This is the example url from the other answer, used in the script below: https://eyes.nasa.gov/dsn/data/1365107113.xml def dictify(r,root=True): # https://stackoverflow.com/questions/2148119/how-to-convert-an-xml-string-to-a-dictionary-in-python/30923963#30923963 if root: ret
Read more

Ross-on-Wye

Image
Ross-on-Wye Welsh: Rhosan ar Wy Town centre, looking north from Market House Ross-on-Wye Ross-on-Wye shown within Herefordshire Population 10,700 (2011) [1] OS grid reference SO597241 Unitary authority Herefordshire Ceremonial county Herefordshire Region West Midlands Country England Sovereign state United Kingdom Post town ROSS-ON-WYE Postcode district HR9 Dialling code 01989 Police West Mercia Fire Hereford and Worcester Ambulance West Midlands EU Parliament West Midlands UK Parliament Hereford and South Herefordshire List of places UK England Herefordshire 51°54′50″N 2°35′13″W  /  51.914°N 2.587°W  / 51.914; -2.587 Coordinates: 51°54′50″N 2°35′13″W  /  51.914°N 2.587°W  / 51.914; -2.587 Ross-on-Wye (Welsh: Rhosan ar Wy [2] ) is a small market town with a population of 10,700 (according to the 2011 census), in south eastern Herefordshire, England, located on the River Wye, and on
Read more

Eastern Orthodox Church

Image
Not to be confused with Oriental Orthodoxy, Eastern Christianity, or Eastern Catholic Churches. "Eastern Orthodoxy", "Orthodox Church", "Orthodox Catholic Church", and "Orthodox Christian Church" redirect here. For other uses, see Orthodox (disambiguation). This article may be too long to read and navigate comfortably . The readable prose size is 132 kilobytes. Please consider splitting content into sub-articles, condensing it, or adding or removing subheadings. ( January 2018 ) Part of a series on the Eastern Orthodox Church Mosaic of Christ Pantocrator, Hagia Sophia Overview Structure Theology (History of theology) Liturgy Church history Holy Mysteries View of salvation View of Mary View of icons Background Crucifixion / Resurrection / Ascension of Jesus Christianity Christian Church Apostolic succession Four Marks of the Church Orthodoxy Organization Autocephaly Patriarchate
Read more