Why does using array and for loop breaks line into 2? [duplicate]

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This question already has an answer here:

How to loop over the lines of a file?

1 answer

Why does my shell script choke on whitespace or other special characters?

4 answers

Why does the following gives the line I am searching:

grep '<appointment-id internal:ref=1.2.3/>' test.xml 
OUTPUT is <appointment-id internal:ref=1.2.3/>

While the following breaks it into 2 lines?

a=($(grep '<appointment-id internal:ref=1.2.3/>' test.xml)) 
for i in "$a[@]"; do 
 echo "checking $i" 
 grep -n "$i" delete.xml
done

The output is:

checking <appointment-id
checking internal:ref=1.2.3/>

The file is:

<note> 
 <to>Jim</to> 
 <from>John</from> 
 <heading>Reminder</heading> 
 <body>Some text</body> 
 <appointment-id internal:ref=1.2.3/> 
</note>

edited Jun 7 at 20:13

asked Jun 7 at 18:58

Jim

38710

marked as duplicate by ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·, Stephen Kitt, roaima, Jesse_b, ilkkachuÂ bash
Users with the Â bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Jun 7 at 20:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

because word splitting happening per default IFS=$' tn'. see What is the 'IFS'?
â€“Â ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·
Jun 7 at 19:03

The first solution in How to loop over the lines of a file? should work in this case too, to fill the array. The second could be used directly, without an array at all, or to build the array with array extension (a+=("$line")).
â€“Â ilkkachu
Jun 7 at 19:50

add a commentÂ |Â

up vote
-1
down vote

favorite

This question already has an answer here:

How to loop over the lines of a file?

1 answer

Why does my shell script choke on whitespace or other special characters?

4 answers

Why does the following gives the line I am searching:

grep '<appointment-id internal:ref=1.2.3/>' test.xml 
OUTPUT is <appointment-id internal:ref=1.2.3/>

While the following breaks it into 2 lines?

a=($(grep '<appointment-id internal:ref=1.2.3/>' test.xml)) 
for i in "$a[@]"; do 
 echo "checking $i" 
 grep -n "$i" delete.xml
done

The output is:

checking <appointment-id
checking internal:ref=1.2.3/>

The file is:

<note> 
 <to>Jim</to> 
 <from>John</from> 
 <heading>Reminder</heading> 
 <body>Some text</body> 
 <appointment-id internal:ref=1.2.3/> 
</note>

edited Jun 7 at 20:13

asked Jun 7 at 18:58

Jim

38710

marked as duplicate by ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·, Stephen Kitt, roaima, Jesse_b, ilkkachuÂ bash
Users with the Â bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Jun 7 at 20:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

because word splitting happening per default IFS=$' tn'. see What is the 'IFS'?
â€“Â ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·
Jun 7 at 19:03

The first solution in How to loop over the lines of a file? should work in this case too, to fill the array. The second could be used directly, without an array at all, or to build the array with array extension (a+=("$line")).
â€“Â ilkkachu
Jun 7 at 19:50

add a commentÂ |Â

up vote
-1
down vote

favorite

This question already has an answer here:

How to loop over the lines of a file?

1 answer

Why does my shell script choke on whitespace or other special characters?

4 answers

Why does the following gives the line I am searching:

grep '<appointment-id internal:ref=1.2.3/>' test.xml 
OUTPUT is <appointment-id internal:ref=1.2.3/>

While the following breaks it into 2 lines?

a=($(grep '<appointment-id internal:ref=1.2.3/>' test.xml)) 
for i in "$a[@]"; do 
 echo "checking $i" 
 grep -n "$i" delete.xml
done

The output is:

checking <appointment-id
checking internal:ref=1.2.3/>

The file is:

<note> 
 <to>Jim</to> 
 <from>John</from> 
 <heading>Reminder</heading> 
 <body>Some text</body> 
 <appointment-id internal:ref=1.2.3/> 
</note>

edited Jun 7 at 20:13

asked Jun 7 at 18:58

Jim

38710

This question already has an answer here:

How to loop over the lines of a file?

1 answer

Why does my shell script choke on whitespace or other special characters?

4 answers

Why does the following gives the line I am searching:

grep '<appointment-id internal:ref=1.2.3/>' test.xml 
OUTPUT is <appointment-id internal:ref=1.2.3/>

While the following breaks it into 2 lines?

a=($(grep '<appointment-id internal:ref=1.2.3/>' test.xml)) 
for i in "$a[@]"; do 
 echo "checking $i" 
 grep -n "$i" delete.xml
done

The output is:

checking <appointment-id
checking internal:ref=1.2.3/>

The file is:

<note> 
 <to>Jim</to> 
 <from>John</from> 
 <heading>Reminder</heading> 
 <body>Some text</body> 
 <appointment-id internal:ref=1.2.3/> 
</note>

This question already has an answer here:

How to loop over the lines of a file?

1 answer

Why does my shell script choke on whitespace or other special characters?

4 answers

edited Jun 7 at 20:13

asked Jun 7 at 18:58

Jim

38710

edited Jun 7 at 20:13

asked Jun 7 at 18:58

Jim

38710

asked Jun 7 at 18:58

Jim

38710

asked Jun 7 at 18:58

Jim

38710

marked as duplicate by ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·, Stephen Kitt, roaima, Jesse_b, ilkkachuÂ bash
Users with the Â bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Jun 7 at 20:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

marked as duplicate by ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·, Stephen Kitt, roaima, Jesse_b, ilkkachuÂ bash
Users with the Â bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Jun 7 at 20:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

because word splitting happening per default IFS=$' tn'. see What is the 'IFS'?
â€“Â ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·
Jun 7 at 19:03

The first solution in How to loop over the lines of a file? should work in this case too, to fill the array. The second could be used directly, without an array at all, or to build the array with array extension (a+=("$line")).
â€“Â ilkkachu
Jun 7 at 19:50

add a commentÂ |Â

1

because word splitting happening per default IFS=$' tn'. see What is the 'IFS'?
â€“Â ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·
Jun 7 at 19:03

The first solution in How to loop over the lines of a file? should work in this case too, to fill the array. The second could be used directly, without an array at all, or to build the array with array extension (a+=("$line")).
â€“Â ilkkachu
Jun 7 at 19:50

because word splitting happening per default IFS=$' tn'. see What is the 'IFS'?
â€“Â ÃŽÂ±Ã’Â“sÃÂ½ÃŽÂ¹ÃŽÂ·
Jun 7 at 19:03

The first solution in How to loop over the lines of a file? should work in this case too, to fill the array. The second could be used directly, without an array at all, or to build the array with array extension (a+=("$line")).
â€“Â ilkkachu
Jun 7 at 19:50

add a commentÂ |Â

1 Answer
1

active

oldest

votes

up vote
4
down vote

accepted

The output of the grep is a string containing two whitespace-separated words.

The shell will split that into two words since it's unquoted, and the array will therefore have two entries.

This will do what you want:

a=( "$( grep -F '<appointment-id internal:ref=1.2.3/>' test.xml )" )

However, parsing XML with grep is a horrible idea. Use a proper XML parser instead.

Also, the loop, if all it does is outputting a string, may be replaced by

printf 'checking %sn' "$arr[@]"

To see who made a change to a line matching a pattern in a particular revision of a git-controlled file (see comments below), use git blame -L with the pattern and revision in question. See git blame --help for further info.

Also note that to get the line number of a line matching a pattern:

sed -n '/pattern/=' file

Don't ever feed the result of grep into grep again just to get the line number. If doing so, be sure to use grep -F, or it will fail if the line contains regular expression patterns.

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

add a commentÂ |Â

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
4
down vote

accepted

The output of the grep is a string containing two whitespace-separated words.

The shell will split that into two words since it's unquoted, and the array will therefore have two entries.

This will do what you want:

a=( "$( grep -F '<appointment-id internal:ref=1.2.3/>' test.xml )" )

However, parsing XML with grep is a horrible idea. Use a proper XML parser instead.

Also, the loop, if all it does is outputting a string, may be replaced by

printf 'checking %sn' "$arr[@]"

Also note that to get the line number of a line matching a pattern:

sed -n '/pattern/=' file

Don't ever feed the result of grep into grep again just to get the line number. If doing so, be sure to use grep -F, or it will fail if the line contains regular expression patterns.

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

add a commentÂ |Â

up vote
4
down vote

accepted

The output of the grep is a string containing two whitespace-separated words.

The shell will split that into two words since it's unquoted, and the array will therefore have two entries.

This will do what you want:

a=( "$( grep -F '<appointment-id internal:ref=1.2.3/>' test.xml )" )

However, parsing XML with grep is a horrible idea. Use a proper XML parser instead.

Also, the loop, if all it does is outputting a string, may be replaced by

printf 'checking %sn' "$arr[@]"

Also note that to get the line number of a line matching a pattern:

sed -n '/pattern/=' file

Don't ever feed the result of grep into grep again just to get the line number. If doing so, be sure to use grep -F, or it will fail if the line contains regular expression patterns.

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

add a commentÂ |Â

up vote
4
down vote

accepted

The output of the grep is a string containing two whitespace-separated words.

The shell will split that into two words since it's unquoted, and the array will therefore have two entries.

This will do what you want:

a=( "$( grep -F '<appointment-id internal:ref=1.2.3/>' test.xml )" )

However, parsing XML with grep is a horrible idea. Use a proper XML parser instead.

Also, the loop, if all it does is outputting a string, may be replaced by

printf 'checking %sn' "$arr[@]"

Also note that to get the line number of a line matching a pattern:

sed -n '/pattern/=' file

Don't ever feed the result of grep into grep again just to get the line number. If doing so, be sure to use grep -F, or it will fail if the line contains regular expression patterns.

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

The output of the grep is a string containing two whitespace-separated words.

The shell will split that into two words since it's unquoted, and the array will therefore have two entries.

This will do what you want:

a=( "$( grep -F '<appointment-id internal:ref=1.2.3/>' test.xml )" )

However, parsing XML with grep is a horrible idea. Use a proper XML parser instead.

Also, the loop, if all it does is outputting a string, may be replaced by

printf 'checking %sn' "$arr[@]"

Also note that to get the line number of a line matching a pattern:

sed -n '/pattern/=' file

Don't ever feed the result of grep into grep again just to get the line number. If doing so, be sure to use grep -F, or it will fail if the line contains regular expression patterns.

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

edited Jun 7 at 21:03

answered Jun 7 at 19:05

Kusalananda

101k13199312

answered Jun 7 at 19:05

Kusalananda

101k13199312

answered Jun 7 at 19:05

Kusalananda

101k13199312

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

add a commentÂ |Â

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

This conversation has been moved to chat.
â€“Â Michael Mrozekâ™¦
Jun 10 at 21:12

add a commentÂ |Â

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