Array inside an Array: Different syntax for Array in bash
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0
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I found the following example from here. But I can't understand how is array arr is being defined.
a='domain.de;de;https'
$ arr=($a//;/ )
What is the advantage of defining it like this?
Actually, I want to store an array inside an array of varying size like as follows:
declare -a Workspace=(
"$Folder[0]" "CFD" "General,Markdown"
"$Folder[4]" "GPU" "General,Markdown,Python,C,Java"
)
For example in above, I want to access the terms General and Markdown for CFD.
bash shell-script array gnu bash-array
asked Nov 22 at 0:19
Nikhil
20919
add a comment |
up vote
0
down vote
favorite
I found the following example from here. But I can't understand how is array arr is being defined.
a='domain.de;de;https'
$ arr=($a//;/ )
What is the advantage of defining it like this?
Actually, I want to store an array inside an array of varying size like as follows:
declare -a Workspace=(
"$Folder[0]" "CFD" "General,Markdown"
"$Folder[4]" "GPU" "General,Markdown,Python,C,Java"
)
For example in above, I want to access the terms General and Markdown for CFD.
bash shell-script array gnu bash-array
asked Nov 22 at 0:19
Nikhil
20919
1
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I found the following example from here. But I can't understand how is array arr is being defined.
a='domain.de;de;https'
$ arr=($a//;/ )
What is the advantage of defining it like this?
Actually, I want to store an array inside an array of varying size like as follows:
declare -a Workspace=(
"$Folder[0]" "CFD" "General,Markdown"
"$Folder[4]" "GPU" "General,Markdown,Python,C,Java"
)
For example in above, I want to access the terms General and Markdown for CFD.
bash shell-script array gnu bash-array
asked Nov 22 at 0:19
Nikhil
20919
I found the following example from here. But I can't understand how is array arr is being defined.
a='domain.de;de;https'
$ arr=($a//;/ )
What is the advantage of defining it like this?
Actually, I want to store an array inside an array of varying size like as follows:
declare -a Workspace=(
"$Folder[0]" "CFD" "General,Markdown"
"$Folder[4]" "GPU" "General,Markdown,Python,C,Java"
)
For example in above, I want to access the terms General and Markdown for CFD.
bash shell-script array gnu bash-array
bash shell-script array gnu bash-array
asked Nov 22 at 0:19
Nikhil
20919
asked Nov 22 at 0:19
Nikhil
20919
edited Nov 22 at 0:28
asked Nov 22 at 0:19
Nikhil
20919
asked Nov 22 at 0:19
Nikhil
20919
asked Nov 22 at 0:19
Nikhil
20919
20919
1
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44
add a comment |
1
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44
1
1
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44
add a comment |
1 Answer
1
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up vote
1
down vote
An array of arrays is a bad idea in shell (any shell). You need some other language.
how is array
arrbeing defined.?a='domain.de;de;https'
arr=($a//;/ )
It works by:
- replacing every
;by anspace - Assuming IFS is space, tab, newline (the default)
- splitting on space (included in IFS) the unquoted expansion of
$... - assigning it to an array
(...) - and naming that array
arr=.
What is the advantage of defining it like this?
None, only problems:
- If any of the elements contains an space, a tab or a newline, it will be split.
- As globbing was not turn off, any
*,?or[ ]will be expanded to matching files. - If nullglob is active, any string containing
*,?or[ ]will be removed. - if failglob is active any of the previous characters will generate an error.
In short, splitting on the shell is full of gotchas.
answered Nov 22 at 0:44
Isaac
9,72811445
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
An array of arrays is a bad idea in shell (any shell). You need some other language.
how is array
arrbeing defined.?a='domain.de;de;https'
arr=($a//;/ )
It works by:
- replacing every
;by anspace - Assuming IFS is space, tab, newline (the default)
- splitting on space (included in IFS) the unquoted expansion of
$... - assigning it to an array
(...) - and naming that array
arr=.
What is the advantage of defining it like this?
None, only problems:
- If any of the elements contains an space, a tab or a newline, it will be split.
- As globbing was not turn off, any
*,?or[ ]will be expanded to matching files. - If nullglob is active, any string containing
*,?or[ ]will be removed. - if failglob is active any of the previous characters will generate an error.
In short, splitting on the shell is full of gotchas.
answered Nov 22 at 0:44
Isaac
9,72811445
add a comment |
up vote
1
down vote
An array of arrays is a bad idea in shell (any shell). You need some other language.
how is array
arrbeing defined.?a='domain.de;de;https'
arr=($a//;/ )
It works by:
- replacing every
;by anspace - Assuming IFS is space, tab, newline (the default)
- splitting on space (included in IFS) the unquoted expansion of
$... - assigning it to an array
(...) - and naming that array
arr=.
What is the advantage of defining it like this?
None, only problems:
- If any of the elements contains an space, a tab or a newline, it will be split.
- As globbing was not turn off, any
*,?or[ ]will be expanded to matching files. - If nullglob is active, any string containing
*,?or[ ]will be removed. - if failglob is active any of the previous characters will generate an error.
In short, splitting on the shell is full of gotchas.
answered Nov 22 at 0:44
Isaac
9,72811445
add a comment |
up vote
1
down vote
up vote
1
down vote
An array of arrays is a bad idea in shell (any shell). You need some other language.
how is array
arrbeing defined.?a='domain.de;de;https'
arr=($a//;/ )
It works by:
- replacing every
;by anspace - Assuming IFS is space, tab, newline (the default)
- splitting on space (included in IFS) the unquoted expansion of
$... - assigning it to an array
(...) - and naming that array
arr=.
What is the advantage of defining it like this?
None, only problems:
- If any of the elements contains an space, a tab or a newline, it will be split.
- As globbing was not turn off, any
*,?or[ ]will be expanded to matching files. - If nullglob is active, any string containing
*,?or[ ]will be removed. - if failglob is active any of the previous characters will generate an error.
In short, splitting on the shell is full of gotchas.
answered Nov 22 at 0:44
Isaac
9,72811445
An array of arrays is a bad idea in shell (any shell). You need some other language.
how is array
arrbeing defined.?a='domain.de;de;https'
arr=($a//;/ )
It works by:
- replacing every
;by anspace - Assuming IFS is space, tab, newline (the default)
- splitting on space (included in IFS) the unquoted expansion of
$... - assigning it to an array
(...) - and naming that array
arr=.
What is the advantage of defining it like this?
None, only problems:
- If any of the elements contains an space, a tab or a newline, it will be split.
- As globbing was not turn off, any
*,?or[ ]will be expanded to matching files. - If nullglob is active, any string containing
*,?or[ ]will be removed. - if failglob is active any of the previous characters will generate an error.
In short, splitting on the shell is full of gotchas.
answered Nov 22 at 0:44
Isaac
9,72811445
answered Nov 22 at 0:44
Isaac
9,72811445
answered Nov 22 at 0:44
Isaac
9,72811445
answered Nov 22 at 0:44
Isaac
9,72811445
9,72811445
add a comment |
add a comment |
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1
Just because you can make an array of space delimited elements in bash doesn't make it a good idea. A good fat structure is important, and if the problem is this complex, consider a more powerful and flexible language like Perl.
– Jeff Schaller
Nov 22 at 0:44