Does readarray allow to specify line delimiter?
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1
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In bash read builtin has -d for us to specify line delimiter other than newline
Does readarray provide some way to specify line delimiter?
- Is it correct that it has no an option for that purpose?
- Is there a shell default variable for that purpose, similar to
IFSfor field delimiter?
Thanks.
After I saw steeldriver's comment,
$ bash --version
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ help readarray
readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from a file into an array variable.
A synonym for `mapfile'.
but later I discovered:
$ help mapfile
mapfile: mapfile [-d delim] [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from the standard input into an indexed array variable.
Read lines from the standard input into the indexed array variable ARRAY, or
from file descriptor FD if the -u option is supplied. The variable MAPFILE
is the default ARRAY.
Options:
-d delim Use DELIM to terminate lines, instead of newline
...
bash array
asked Nov 17 at 16:15
Tim
25.1k72243444
add a comment |
up vote
1
down vote
favorite
In bash read builtin has -d for us to specify line delimiter other than newline
Does readarray provide some way to specify line delimiter?
- Is it correct that it has no an option for that purpose?
- Is there a shell default variable for that purpose, similar to
IFSfor field delimiter?
Thanks.
After I saw steeldriver's comment,
$ bash --version
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ help readarray
readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from a file into an array variable.
A synonym for `mapfile'.
but later I discovered:
$ help mapfile
mapfile: mapfile [-d delim] [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from the standard input into an indexed array variable.
Read lines from the standard input into the indexed array variable ARRAY, or
from file descriptor FD if the -u option is supplied. The variable MAPFILE
is the default ARRAY.
Options:
-d delim Use DELIM to terminate lines, instead of newline
...
bash array
asked Nov 17 at 16:15
Tim
25.1k72243444
1
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (-d delim)
– steeldriver
Nov 17 at 16:30
Thanks. Updated.
– Tim
Nov 17 at 16:32
1
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
In bash read builtin has -d for us to specify line delimiter other than newline
Does readarray provide some way to specify line delimiter?
- Is it correct that it has no an option for that purpose?
- Is there a shell default variable for that purpose, similar to
IFSfor field delimiter?
Thanks.
After I saw steeldriver's comment,
$ bash --version
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ help readarray
readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from a file into an array variable.
A synonym for `mapfile'.
but later I discovered:
$ help mapfile
mapfile: mapfile [-d delim] [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from the standard input into an indexed array variable.
Read lines from the standard input into the indexed array variable ARRAY, or
from file descriptor FD if the -u option is supplied. The variable MAPFILE
is the default ARRAY.
Options:
-d delim Use DELIM to terminate lines, instead of newline
...
bash array
asked Nov 17 at 16:15
Tim
25.1k72243444
In bash read builtin has -d for us to specify line delimiter other than newline
Does readarray provide some way to specify line delimiter?
- Is it correct that it has no an option for that purpose?
- Is there a shell default variable for that purpose, similar to
IFSfor field delimiter?
Thanks.
After I saw steeldriver's comment,
$ bash --version
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ help readarray
readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from a file into an array variable.
A synonym for `mapfile'.
but later I discovered:
$ help mapfile
mapfile: mapfile [-d delim] [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
Read lines from the standard input into an indexed array variable.
Read lines from the standard input into the indexed array variable ARRAY, or
from file descriptor FD if the -u option is supplied. The variable MAPFILE
is the default ARRAY.
Options:
-d delim Use DELIM to terminate lines, instead of newline
...
bash array
bash array
asked Nov 17 at 16:15
Tim
25.1k72243444
asked Nov 17 at 16:15
Tim
25.1k72243444
edited Nov 17 at 16:45
asked Nov 17 at 16:15
Tim
25.1k72243444
asked Nov 17 at 16:15
Tim
25.1k72243444
asked Nov 17 at 16:15
Tim
25.1k72243444
25.1k72243444
1
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (-d delim)
– steeldriver
Nov 17 at 16:30
Thanks. Updated.
– Tim
Nov 17 at 16:32
1
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39
add a comment |
1
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (-d delim)
– steeldriver
Nov 17 at 16:30
Thanks. Updated.
– Tim
Nov 17 at 16:32
1
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39
1
1
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (
-d delim)– steeldriver
Nov 17 at 16:30
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (
-d delim)– steeldriver
Nov 17 at 16:30
Thanks. Updated.
– Tim
Nov 17 at 16:32
Thanks. Updated.
– Tim
Nov 17 at 16:32
1
1
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39
add a comment |
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
Since bash version 4.4, yes it does. From the release announcement Bash-4.4 Release Available:
The most notable new features are mapfile's ability to use an arbitrary
record delimiter;
(readarray being a synonym for mapfile). The description in man bash is
-d The first character of delim is used to terminate each
input line, rather than newline.
answered Nov 17 at 16:43
steeldriver
33.7k34983
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is1 2 3. andreadarray -d "2" myarr < f1andecho "${myarr[0]}"outputs1 2andecho "${myarr[1]}"outputs3.
– Tim
Nov 17 at 16:49
@Tim you can add-tif you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
Nov 17 at 16:55
In1 2 3,2isn't trailing however. What does "trailing" mean?
– Tim
Nov 17 at 17:07
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements1and3(the1would have a space after it and the3would be preceded by a space and probably followed by a newline).
– Kusalananda
Nov 17 at 17:36
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with-d) is included in the data unless-tis also used. See also When to use the terms "delimiter," "terminator," and "separator"
– Kusalananda
Nov 17 at 17:44
|
show 1 more comment
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
Since bash version 4.4, yes it does. From the release announcement Bash-4.4 Release Available:
The most notable new features are mapfile's ability to use an arbitrary
record delimiter;
(readarray being a synonym for mapfile). The description in man bash is
-d The first character of delim is used to terminate each
input line, rather than newline.
answered Nov 17 at 16:43
steeldriver
33.7k34983
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is1 2 3. andreadarray -d "2" myarr < f1andecho "${myarr[0]}"outputs1 2andecho "${myarr[1]}"outputs3.
– Tim
Nov 17 at 16:49
@Tim you can add-tif you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
Nov 17 at 16:55
In1 2 3,2isn't trailing however. What does "trailing" mean?
– Tim
Nov 17 at 17:07
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements1and3(the1would have a space after it and the3would be preceded by a space and probably followed by a newline).
– Kusalananda
Nov 17 at 17:36
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with-d) is included in the data unless-tis also used. See also When to use the terms "delimiter," "terminator," and "separator"
– Kusalananda
Nov 17 at 17:44
|
show 1 more comment
up vote
3
down vote
accepted
Since bash version 4.4, yes it does. From the release announcement Bash-4.4 Release Available:
The most notable new features are mapfile's ability to use an arbitrary
record delimiter;
(readarray being a synonym for mapfile). The description in man bash is
-d The first character of delim is used to terminate each
input line, rather than newline.
answered Nov 17 at 16:43
steeldriver
33.7k34983
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is1 2 3. andreadarray -d "2" myarr < f1andecho "${myarr[0]}"outputs1 2andecho "${myarr[1]}"outputs3.
– Tim
Nov 17 at 16:49
@Tim you can add-tif you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
Nov 17 at 16:55
In1 2 3,2isn't trailing however. What does "trailing" mean?
– Tim
Nov 17 at 17:07
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements1and3(the1would have a space after it and the3would be preceded by a space and probably followed by a newline).
– Kusalananda
Nov 17 at 17:36
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with-d) is included in the data unless-tis also used. See also When to use the terms "delimiter," "terminator," and "separator"
– Kusalananda
Nov 17 at 17:44
|
show 1 more comment
up vote
3
down vote
accepted
up vote
3
down vote
accepted
Since bash version 4.4, yes it does. From the release announcement Bash-4.4 Release Available:
The most notable new features are mapfile's ability to use an arbitrary
record delimiter;
(readarray being a synonym for mapfile). The description in man bash is
-d The first character of delim is used to terminate each
input line, rather than newline.
answered Nov 17 at 16:43
steeldriver
33.7k34983
Since bash version 4.4, yes it does. From the release announcement Bash-4.4 Release Available:
The most notable new features are mapfile's ability to use an arbitrary
record delimiter;
(readarray being a synonym for mapfile). The description in man bash is
-d The first character of delim is used to terminate each
input line, rather than newline.
answered Nov 17 at 16:43
steeldriver
33.7k34983
answered Nov 17 at 16:43
steeldriver
33.7k34983
answered Nov 17 at 16:43
steeldriver
33.7k34983
answered Nov 17 at 16:43
steeldriver
33.7k34983
33.7k34983
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is1 2 3. andreadarray -d "2" myarr < f1andecho "${myarr[0]}"outputs1 2andecho "${myarr[1]}"outputs3.
– Tim
Nov 17 at 16:49
@Tim you can add-tif you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
Nov 17 at 16:55
In1 2 3,2isn't trailing however. What does "trailing" mean?
– Tim
Nov 17 at 17:07
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements1and3(the1would have a space after it and the3would be preceded by a space and probably followed by a newline).
– Kusalananda
Nov 17 at 17:36
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with-d) is included in the data unless-tis also used. See also When to use the terms "delimiter," "terminator," and "separator"
– Kusalananda
Nov 17 at 17:44
|
show 1 more comment
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is1 2 3. andreadarray -d "2" myarr < f1andecho "${myarr[0]}"outputs1 2andecho "${myarr[1]}"outputs3.
– Tim
Nov 17 at 16:49
@Tim you can add-tif you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
Nov 17 at 16:55
In1 2 3,2isn't trailing however. What does "trailing" mean?
– Tim
Nov 17 at 17:07
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements1and3(the1would have a space after it and the3would be preceded by a space and probably followed by a newline).
– Kusalananda
Nov 17 at 17:36
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with-d) is included in the data unless-tis also used. See also When to use the terms "delimiter," "terminator," and "separator"
– Kusalananda
Nov 17 at 17:44
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is
1 2 3. and readarray -d "2" myarr < f1 and echo "${myarr[0]}" outputs 1 2 and echo "${myarr[1]}" outputs 3.– Tim
Nov 17 at 16:49
Thanks. Does delimiter mean the same as a separator and thus is to be removed? I have a file whose content is
1 2 3. and readarray -d "2" myarr < f1 and echo "${myarr[0]}" outputs 1 2 and echo "${myarr[1]}" outputs 3.– Tim
Nov 17 at 16:49
@Tim you can add
-t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter– steeldriver
Nov 17 at 16:55
@Tim you can add
-t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter– steeldriver
Nov 17 at 16:55
In
1 2 3, 2 isn't trailing however. What does "trailing" mean?– Tim
Nov 17 at 17:07
In
1 2 3, 2 isn't trailing however. What does "trailing" mean?– Tim
Nov 17 at 17:07
1
1
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements
1 and 3 (the 1 would have a space after it and the 3 would be preceded by a space and probably followed by a newline).– Kusalananda
Nov 17 at 17:36
@Tim To remove the trailing delimiter means to remove the delimiter from each element of the array. In your case, that would result in the two elements
1 and 3 (the 1 would have a space after it and the 3 would be preceded by a space and probably followed by a newline).– Kusalananda
Nov 17 at 17:36
2
2
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with
-d) is included in the data unless -t is also used. See also When to use the terms "delimiter," "terminator," and "separator"– Kusalananda
Nov 17 at 17:44
@Tim There is no mentioning of "separator". The delimiter (newline, or the character specified with
-d) is included in the data unless -t is also used. See also When to use the terms "delimiter," "terminator," and "separator"– Kusalananda
Nov 17 at 17:44
|
show 1 more comment
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1
It depends how recent a version of bash (it was introduced in 4.4 IIRC) - a simple perusal of the manpage should indicate whether yours does (
-d delim)– steeldriver
Nov 17 at 16:30
Thanks. Updated.
– Tim
Nov 17 at 16:32
1
@JeffSchaller "What happened when you tried?"
– Tim
Nov 17 at 16:39