Does readarray allow to specify line delimiter?

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1
down vote

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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 IFS for 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

...

edited 2 days ago

asked 2 days ago

Tim

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
2 days ago

Thanks. Updated.
– Tim
2 days ago

1

@JeffSchaller "What happened when you tried?"
– Tim
2 days ago

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 IFS for 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

...

edited 2 days ago

asked 2 days ago

Tim

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
2 days ago

Thanks. Updated.
– Tim
2 days ago

1

@JeffSchaller "What happened when you tried?"
– Tim
2 days ago

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 IFS for 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

...

edited 2 days ago

asked 2 days ago

Tim

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 IFS for 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

edited 2 days ago

asked 2 days ago

Tim

edited 2 days ago

asked 2 days ago

Tim

edited 2 days ago

asked 2 days ago

Tim

asked 2 days ago

Tim

asked 2 days ago

Tim

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
2 days ago

Thanks. Updated.
– Tim
2 days ago

1

@JeffSchaller "What happened when you tried?"
– Tim
2 days ago

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
2 days ago

Thanks. Updated.
– Tim
2 days ago

1

@JeffSchaller "What happened when you tried?"
– Tim
2 days ago

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
2 days ago

Thanks. Updated.
– Tim
2 days ago

@JeffSchaller "What happened when you tried?"
– Tim
2 days ago

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 2 days ago

steeldriver

33.6k34982

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
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

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
2 days ago

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
2 days ago

|
show 1 more comment

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1 Answer
1

active

oldest

votes

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 2 days ago

steeldriver

33.6k34982

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
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

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
2 days ago

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
2 days ago

|
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 2 days ago

steeldriver

33.6k34982

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
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

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
2 days ago

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
2 days ago

|
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 2 days ago

steeldriver

33.6k34982

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 2 days ago

steeldriver

33.6k34982

answered 2 days ago

steeldriver

33.6k34982

answered 2 days ago

steeldriver

33.6k34982

answered 2 days ago

steeldriver

33.6k34982

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
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

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
2 days ago

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
2 days ago

|
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 is 1 2 3. and readarray -d "2" myarr < f1 and echo "${myarr[0]}" outputs 1 2 and echo "${myarr[1]}" outputs 3.
– Tim
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

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
2 days ago

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
2 days ago

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
2 days ago

@Tim you can add -t if you want to "Remove a trailing DELIM" - exactly as you would for the default (newline) delimiter
– steeldriver
2 days ago

In 1 2 3, 2 isn't trailing however. What does "trailing" mean?
– Tim
2 days ago

@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
2 days ago

@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
2 days ago

|
show 1 more comment

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