bash for loop with unknown array
2
I need to execute a for loop over the elements in array edg_cdi, but I know it is that array just because my input parameter is chosen='cdi'. If it was chosen='cdt' (or many others) the selected array would be different.
chosen='cdi'
edg_cdi=('40' '46' '37' '43')
edg_cdt=('69' '24' '177' '25')
string='edg_'
wholename=$string$chosen
for i in "${ WHAT_TO_WRITE_HERE [@]}"
do
echo $i
done
The desired output is four echos:
40
46
37
43
bash array
asked Jan 22 at 13:50
UxioUxio
153
add a comment |
2
I need to execute a for loop over the elements in array edg_cdi, but I know it is that array just because my input parameter is chosen='cdi'. If it was chosen='cdt' (or many others) the selected array would be different.
chosen='cdi'
edg_cdi=('40' '46' '37' '43')
edg_cdt=('69' '24' '177' '25')
string='edg_'
wholename=$string$chosen
for i in "${ WHAT_TO_WRITE_HERE [@]}"
do
echo $i
done
The desired output is four echos:
40
46
37
43
bash array
asked Jan 22 at 13:50
UxioUxio
153
when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39
add a comment |
2
2
2
1
I need to execute a for loop over the elements in array edg_cdi, but I know it is that array just because my input parameter is chosen='cdi'. If it was chosen='cdt' (or many others) the selected array would be different.
chosen='cdi'
edg_cdi=('40' '46' '37' '43')
edg_cdt=('69' '24' '177' '25')
string='edg_'
wholename=$string$chosen
for i in "${ WHAT_TO_WRITE_HERE [@]}"
do
echo $i
done
The desired output is four echos:
40
46
37
43
bash array
asked Jan 22 at 13:50
UxioUxio
153
I need to execute a for loop over the elements in array edg_cdi, but I know it is that array just because my input parameter is chosen='cdi'. If it was chosen='cdt' (or many others) the selected array would be different.
chosen='cdi'
edg_cdi=('40' '46' '37' '43')
edg_cdt=('69' '24' '177' '25')
string='edg_'
wholename=$string$chosen
for i in "${ WHAT_TO_WRITE_HERE [@]}"
do
echo $i
done
The desired output is four echos:
40
46
37
43
bash array
bash array
asked Jan 22 at 13:50
UxioUxio
153
asked Jan 22 at 13:50
UxioUxio
153
edited Jan 22 at 19:12
Uxio
asked Jan 22 at 13:50
UxioUxio
153
asked Jan 22 at 13:50
UxioUxio
153
asked Jan 22 at 13:50
UxioUxio
153
153
when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39
add a comment |
when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39
when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39
add a comment |
2 Answers
2
active
oldest
votes
2
+150
You can use variable indirection with a proper array (unlike @user1330614's answer, which fakes an array with a plain variable). The tricky thing is that you have to include the array element (or [@] for all elements) in the variable you're indirecting through. Like this:
edg_cdi=('40' '46' '37' '43')
wholename="edg_cdi" # Same value original code generates
wholearray="${wholename}[@]" # This includes the array name AND "[@]"
for i in "${!wholearray}"; do
#...etc
To get e.g. the n'th element of the array, you could use something like:
n=3 # The element number we want
wholename_n="${wholename}[n]" # Note that n does not have a $; it won't be resolved until use
dosomethingwith "${!wholename_n}" # this resolves n and gets the 3rd element
n=2
dosomethingwith "${!wholename_n}" # this re-resolves n and gets the 2nd element
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
1
Now this is the answer! I was going to publish a solution based ondeclare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is likeedg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!
– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
add a comment |
1
Your code should look like this
chosen='cdi'
edg_cdi="40 46 37 43"
edg_cdt="69 24 177 25"
string='edg_'
wholename=$string$chosen
for i in ${!wholename}
do
echo $i
done
As explained here
answered Jan 22 at 18:37
user1330614user1330614
1334
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
|
show 2 more comments
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
+150
You can use variable indirection with a proper array (unlike @user1330614's answer, which fakes an array with a plain variable). The tricky thing is that you have to include the array element (or [@] for all elements) in the variable you're indirecting through. Like this:
edg_cdi=('40' '46' '37' '43')
wholename="edg_cdi" # Same value original code generates
wholearray="${wholename}[@]" # This includes the array name AND "[@]"
for i in "${!wholearray}"; do
#...etc
To get e.g. the n'th element of the array, you could use something like:
n=3 # The element number we want
wholename_n="${wholename}[n]" # Note that n does not have a $; it won't be resolved until use
dosomethingwith "${!wholename_n}" # this resolves n and gets the 3rd element
n=2
dosomethingwith "${!wholename_n}" # this re-resolves n and gets the 2nd element
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
1
Now this is the answer! I was going to publish a solution based ondeclare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is likeedg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!
– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
add a comment |
2
+150
You can use variable indirection with a proper array (unlike @user1330614's answer, which fakes an array with a plain variable). The tricky thing is that you have to include the array element (or [@] for all elements) in the variable you're indirecting through. Like this:
edg_cdi=('40' '46' '37' '43')
wholename="edg_cdi" # Same value original code generates
wholearray="${wholename}[@]" # This includes the array name AND "[@]"
for i in "${!wholearray}"; do
#...etc
To get e.g. the n'th element of the array, you could use something like:
n=3 # The element number we want
wholename_n="${wholename}[n]" # Note that n does not have a $; it won't be resolved until use
dosomethingwith "${!wholename_n}" # this resolves n and gets the 3rd element
n=2
dosomethingwith "${!wholename_n}" # this re-resolves n and gets the 2nd element
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
1
Now this is the answer! I was going to publish a solution based ondeclare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is likeedg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!
– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
add a comment |
2
+150
2
+150
2
+150
You can use variable indirection with a proper array (unlike @user1330614's answer, which fakes an array with a plain variable). The tricky thing is that you have to include the array element (or [@] for all elements) in the variable you're indirecting through. Like this:
edg_cdi=('40' '46' '37' '43')
wholename="edg_cdi" # Same value original code generates
wholearray="${wholename}[@]" # This includes the array name AND "[@]"
for i in "${!wholearray}"; do
#...etc
To get e.g. the n'th element of the array, you could use something like:
n=3 # The element number we want
wholename_n="${wholename}[n]" # Note that n does not have a $; it won't be resolved until use
dosomethingwith "${!wholename_n}" # this resolves n and gets the 3rd element
n=2
dosomethingwith "${!wholename_n}" # this re-resolves n and gets the 2nd element
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
You can use variable indirection with a proper array (unlike @user1330614's answer, which fakes an array with a plain variable). The tricky thing is that you have to include the array element (or [@] for all elements) in the variable you're indirecting through. Like this:
edg_cdi=('40' '46' '37' '43')
wholename="edg_cdi" # Same value original code generates
wholearray="${wholename}[@]" # This includes the array name AND "[@]"
for i in "${!wholearray}"; do
#...etc
To get e.g. the n'th element of the array, you could use something like:
n=3 # The element number we want
wholename_n="${wholename}[n]" # Note that n does not have a $; it won't be resolved until use
dosomethingwith "${!wholename_n}" # this resolves n and gets the 3rd element
n=2
dosomethingwith "${!wholename_n}" # this re-resolves n and gets the 2nd element
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
edited Jan 22 at 20:10
Kamil Maciorowski
28.4k156186
28.4k156186
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
answered Jan 22 at 19:47
Gordon DavissonGordon Davisson
26.1k44350
26.1k44350
1
Now this is the answer! I was going to publish a solution based ondeclare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is likeedg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!
– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
add a comment |
1
Now this is the answer! I was going to publish a solution based ondeclare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is likeedg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!
– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
1
1
Now this is the answer! I was going to publish a solution based on
declare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is like edg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!– Kamil Maciorowski
Jan 22 at 20:26
Now this is the answer! I was going to publish a solution based on
declare -p. I thought it was decent, I still do; but yours is so much better there's no point in publishing my inferior one. My test array is like edg_cdi=('normal' 'with space' 'double"quote' "single'quote" $'new-n-line' 'backslash'), your code handles it flawlessly. Good job!– Kamil Maciorowski
Jan 22 at 20:26
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
Additional reading on the topic with further examples and explanation for those that need even additional clarity perhaps..... Indirect References and Indirect variable references - the new way
– Pimp Juice IT
Jan 26 at 16:53
add a comment |
1
Your code should look like this
chosen='cdi'
edg_cdi="40 46 37 43"
edg_cdt="69 24 177 25"
string='edg_'
wholename=$string$chosen
for i in ${!wholename}
do
echo $i
done
As explained here
answered Jan 22 at 18:37
user1330614user1330614
1334
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
|
show 2 more comments
1
Your code should look like this
chosen='cdi'
edg_cdi="40 46 37 43"
edg_cdt="69 24 177 25"
string='edg_'
wholename=$string$chosen
for i in ${!wholename}
do
echo $i
done
As explained here
answered Jan 22 at 18:37
user1330614user1330614
1334
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
|
show 2 more comments
1
1
1
Your code should look like this
chosen='cdi'
edg_cdi="40 46 37 43"
edg_cdt="69 24 177 25"
string='edg_'
wholename=$string$chosen
for i in ${!wholename}
do
echo $i
done
As explained here
answered Jan 22 at 18:37
user1330614user1330614
1334
Your code should look like this
chosen='cdi'
edg_cdi="40 46 37 43"
edg_cdt="69 24 177 25"
string='edg_'
wholename=$string$chosen
for i in ${!wholename}
do
echo $i
done
As explained here
answered Jan 22 at 18:37
user1330614user1330614
1334
answered Jan 22 at 18:37
user1330614user1330614
1334
answered Jan 22 at 18:37
user1330614user1330614
1334
answered Jan 22 at 18:37
user1330614user1330614
1334
1334
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
|
show 2 more comments
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@Uxio Here's another related post that gives more detail about Variable Indirection: stackoverflow.com/questions/8515411/… too.
– Pimp Juice IT
Jan 22 at 18:52
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
@user1330614 Thank you for your reply, but, I think it is not working properly: The output of this answer is a single row: '40 46 37 43', a single echo. I need $i to be 40, then 46, then 37 and then 43. In this solution, edg_cdi is treated as a single string, but its required to be a set (array) of four independent elements, where the for loop can process independently.
– Uxio
Jan 22 at 19:09
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
I've tested the code myself and it outputs 40 46 37 and 43 in separated rows.
– user1330614
Jan 22 at 19:15
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
Make sure you don't enclose ${!wholename} between ""
– user1330614
Jan 22 at 19:18
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
@user1330614 Oh, sorry! True! Regards, thank you for your help.
– Uxio
Jan 22 at 19:20
|
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when you say the "selected array would be different" you mean an array with different data or a different type, like a simple variable? Anyway for the code you provide for cycle substitute "WHAT_TO_WRITE_HERE" with ${wholename[@]}
– AtomiX84
Jan 22 at 14:20
@Pimp Juice IT. The issue is I don't know the variable name. After knowing chosen='cdi', I can get wholename='edg_cdi'. But "${wholename[@]}" won't work.
– Uxio
Jan 22 at 15:56
@AtomiX84 The output of for i in "${wholename[@]}" is wrong: It's edg_cdi, when it shoud be 40 46 37 43.
– Uxio
Jan 22 at 15:57
This question is maybe a duplicated of stackoverflow.com/questions/10820343/…. Anyway I have fixed your code using the accepted answer there and it works.
– user1330614
Jan 22 at 18:39