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show stdout containing n with line breaks

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1

The output from an executable (cURL) contains n. How can such output be displayed with line breaks ?

Say "tCLn1523 memon" is the output from an executable, piping to printf does not show line breaks.

$
$ echo "tCLn1523 memon"
tCLn1523 memon
$
$ printf "tCLn1523 memon"
tCL
1523 memo
$
$ echo "tCLn1523 memon" | xargs -0 printf '%s'
tCLn1523 memon
$
$ echo "tCLn1523 memon" | awk ' printf "%s", $0 
tCLn1523 memon
$

bash echo newlines

share|improve this question

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That is because echo does only interpret sequences as n if you use the switch -e.
  
  – Janka
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Janka: In this case OP actually wants echo to not interpret the newlines as they are using echo to simulate the curl output that needs to be interpreted.
  
  – Jesse_b
  8 hours ago
  
  

  
  
  
  

add a comment | 

1

The output from an executable (cURL) contains n. How can such output be displayed with line breaks ?

Say "tCLn1523 memon" is the output from an executable, piping to printf does not show line breaks.

$
$ echo "tCLn1523 memon"
tCLn1523 memon
$
$ printf "tCLn1523 memon"
tCL
1523 memo
$
$ echo "tCLn1523 memon" | xargs -0 printf '%s'
tCLn1523 memon
$
$ echo "tCLn1523 memon" | awk ' printf "%s", $0 
tCLn1523 memon
$

bash echo newlines

share|improve this question

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That is because echo does only interpret sequences as n if you use the switch -e.
  
  – Janka
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Janka: In this case OP actually wants echo to not interpret the newlines as they are using echo to simulate the curl output that needs to be interpreted.
  
  – Jesse_b
  8 hours ago
  
  

  
  
  
  

add a comment | 

The output from an executable (cURL) contains n. How can such output be displayed with line breaks ?

Say "tCLn1523 memon" is the output from an executable, piping to printf does not show line breaks.

$
$ echo "tCLn1523 memon"
tCLn1523 memon
$
$ printf "tCLn1523 memon"
tCL
1523 memo
$
$ echo "tCLn1523 memon" | xargs -0 printf '%s'
tCLn1523 memon
$
$ echo "tCLn1523 memon" | awk ' printf "%s", $0 
tCLn1523 memon
$

bash echo newlines

share|improve this question

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

$
$ echo "tCLn1523 memon"
tCLn1523 memon
$
$ printf "tCLn1523 memon"
tCL
1523 memo
$
$ echo "tCLn1523 memon" | xargs -0 printf '%s'
tCLn1523 memon
$
$ echo "tCLn1523 memon" | awk ' printf "%s", $0 
tCLn1523 memon
$

share|improve this question

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

share|improve this question

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

edited 8 hours ago

Kusalananda♦

159k1818 gold badges313313 silver badges500500 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

asked 8 hours ago

SOUserSOUser

1951010 bronze badges

2 Answers
2

active

oldest

votes

3

%s does not interpret escape sequences. You need %b for that:

% echo 'tCLn1523 memon' | xargs -0 printf "%b"
tCL
1523 memo

%

share|improve this answer

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Nice one! I still think command substitution would be better than xargs though, no?
  
  – Jesse_b
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possibly. In either case the entire output ends up as an argument, and with command substitution the extra xargs step is avoided.
  
  – muru
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @muru Thanks for your solution ! I wonder how to make awk printf also work, given %b is not available ?
  
  – SOUser
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You'll probably have to use the input as the format string, after replacing all % with %%
  
  – muru
  7 hours ago
  

  
  
  
  

add a comment | 

1

You probably need to transform double-backslash to backslash as well, otherwise the input format would be ambiguous.

You can write a sed script to translate backslash-letter escapes. This script only translates the escape sequences that it recognizes and otherwise removes the backslash. I've put in support for newline and tab.

… | sed 's/\n/n/g; s/\t/ /; s/\(.)/1/g'

The whitespace in s/\t/ / is a tab character. GNU sed lets you write s/\t/t/.

If you also want octal escapes, use a more advanced tool such as Perl. You can make it parse all the escape sequences that it supports.

… | perl -pe 's/\([0-7]1,3|c.|[oxN][^]+|.)/""\$1""/eeg'

share|improve this answer

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

add a comment | 

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3

%s does not interpret escape sequences. You need %b for that:

% echo 'tCLn1523 memon' | xargs -0 printf "%b"
tCL
1523 memo

%

share|improve this answer

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Nice one! I still think command substitution would be better than xargs though, no?
  
  – Jesse_b
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possibly. In either case the entire output ends up as an argument, and with command substitution the extra xargs step is avoided.
  
  – muru
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @muru Thanks for your solution ! I wonder how to make awk printf also work, given %b is not available ?
  
  – SOUser
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You'll probably have to use the input as the format string, after replacing all % with %%
  
  – muru
  7 hours ago
  

  
  
  
  

add a comment | 

3

%s does not interpret escape sequences. You need %b for that:

% echo 'tCLn1523 memon' | xargs -0 printf "%b"
tCL
1523 memo

%

share|improve this answer

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Nice one! I still think command substitution would be better than xargs though, no?
  
  – Jesse_b
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possibly. In either case the entire output ends up as an argument, and with command substitution the extra xargs step is avoided.
  
  – muru
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @muru Thanks for your solution ! I wonder how to make awk printf also work, given %b is not available ?
  
  – SOUser
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You'll probably have to use the input as the format string, after replacing all % with %%
  
  – muru
  7 hours ago
  

  
  
  
  

add a comment | 

%s does not interpret escape sequences. You need %b for that:

% echo 'tCLn1523 memon' | xargs -0 printf "%b"
tCL
1523 memo

%

share|improve this answer

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

% echo 'tCLn1523 memon' | xargs -0 printf "%b"
tCL
1523 memo

%

share|improve this answer

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

answered 7 hours ago

murumuru

43.6k55 gold badges108108 silver badges181181 bronze badges

1

You probably need to transform double-backslash to backslash as well, otherwise the input format would be ambiguous.

You can write a sed script to translate backslash-letter escapes. This script only translates the escape sequences that it recognizes and otherwise removes the backslash. I've put in support for newline and tab.

… | sed 's/\n/n/g; s/\t/ /; s/\(.)/1/g'

The whitespace in s/\t/ / is a tab character. GNU sed lets you write s/\t/t/.

If you also want octal escapes, use a more advanced tool such as Perl. You can make it parse all the escape sequences that it supports.

… | perl -pe 's/\([0-7]1,3|c.|[oxN][^]+|.)/""\$1""/eeg'

share|improve this answer

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

add a comment | 

1

You probably need to transform double-backslash to backslash as well, otherwise the input format would be ambiguous.

You can write a sed script to translate backslash-letter escapes. This script only translates the escape sequences that it recognizes and otherwise removes the backslash. I've put in support for newline and tab.

… | sed 's/\n/n/g; s/\t/ /; s/\(.)/1/g'

The whitespace in s/\t/ / is a tab character. GNU sed lets you write s/\t/t/.

If you also want octal escapes, use a more advanced tool such as Perl. You can make it parse all the escape sequences that it supports.

… | perl -pe 's/\([0-7]1,3|c.|[oxN][^]+|.)/""\$1""/eeg'

share|improve this answer

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

add a comment | 

You probably need to transform double-backslash to backslash as well, otherwise the input format would be ambiguous.

You can write a sed script to translate backslash-letter escapes. This script only translates the escape sequences that it recognizes and otherwise removes the backslash. I've put in support for newline and tab.

… | sed 's/\n/n/g; s/\t/ /; s/\(.)/1/g'

The whitespace in s/\t/ / is a tab character. GNU sed lets you write s/\t/t/.

If you also want octal escapes, use a more advanced tool such as Perl. You can make it parse all the escape sequences that it supports.

… | perl -pe 's/\([0-7]1,3|c.|[oxN][^]+|.)/""\$1""/eeg'

share|improve this answer

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

… | sed 's/\n/n/g; s/\t/ /; s/\(.)/1/g'

… | perl -pe 's/\([0-7]1,3|c.|[oxN][^]+|.)/""\$1""/eeg'

share|improve this answer

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges

answered 7 hours ago

GillesGilles

569k136136 gold badges11711171 silver badges16841684 bronze badges