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}

0

I have a text file with newline delimited strings. My problem is to process each line as follows: shuffle the order of tokens by using space as a delimiter.

For example:

Input:
A B C

Output:
C A B

Running the command/script repeatedly should of course provide different order.

My current solution (for a single text line):

$ cat <file> | tr " " "n" | shuf | tr "n" " "

Is there a nice (a better) command line combo to process a text file with multiple lines?

linux bash text-processing

share|improve this question

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  don't abuse cat, tr " " "n" < <file> | shuf | tr "n" " " is the same.
  
  – Quora Feans
  49 mins ago
  

  
  
  
  

add a comment | 

0

I have a text file with newline delimited strings. My problem is to process each line as follows: shuffle the order of tokens by using space as a delimiter.

For example:

Input:
A B C

Output:
C A B

Running the command/script repeatedly should of course provide different order.

My current solution (for a single text line):

$ cat <file> | tr " " "n" | shuf | tr "n" " "

Is there a nice (a better) command line combo to process a text file with multiple lines?

linux bash text-processing

share|improve this question

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  don't abuse cat, tr " " "n" < <file> | shuf | tr "n" " " is the same.
  
  – Quora Feans
  49 mins ago
  

  
  
  
  

add a comment | 

I have a text file with newline delimited strings. My problem is to process each line as follows: shuffle the order of tokens by using space as a delimiter.

For example:

Input:
A B C

Output:
C A B

Running the command/script repeatedly should of course provide different order.

My current solution (for a single text line):

$ cat <file> | tr " " "n" | shuf | tr "n" " "

Is there a nice (a better) command line combo to process a text file with multiple lines?

linux bash text-processing

share|improve this question

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

share|improve this question

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

share|improve this question

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

asked 1 hour ago

Vladislavs DovgalecsVladislavs Dovgalecs

41933 silver badges1010 bronze badges

3 Answers
3

active

oldest

votes

0

To pass the parameters as one line:

shuf -e one two three four is what you need.

shuf -e $(cat <file>) | tr "n" " " for a file with one line, as in your example.

For multiple lines:

while read line; do shuf -e $line | tr "n" " " && echo n; done < <file>

share|improve this answer

edited 30 mins ago

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This will print each element out on a newline though..
  
  – Zhenhir
  32 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Zhenhir: edited.
  
  – Quora Feans
  28 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That’s funny;  just a moment ago I read a comment that said “don’t abuse cat”.
  
  – G-Man
  3 mins ago
  

  
  
  
  

add a comment | 

0

Given

$ cat file

A B C

D E F

G H I J

then using shuffle from perl's List::Util module:

$ perl -MList::Util=shuffle -alpe '$_ = join " ", shuffle @F' file

C B A

E D F

I J G H

With bash read -a and shuf (it's a little tricky to get the delimiters right):

$ while read -a arr; do shuf -e "${arr[@]}" | awk -vRS= -F'n' '{NF+=0} 1'; done < file

A C B

F E D

J I G H

share|improve this answer

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

add a comment | 

0

Your original command can be simplified to

shuf -e A B C | tr "n" " " && echo ""

or

shuffled=( $(shuf -e A B C) ) ; echo ${shuffled[*]}

Which I think is a little less hacky and is also faster from my rudimentary tests.

If you have a file at ~/test which contains

A B C

D E F

You can shuffle and echo each line with the following command

while read line; do shuffled=( $(shuf -e $line) ) ; echo ${shuffled[*]} ; done < ~/test

result:

B C A

G E F

How this works:

shuf -e splits on spaces as well as newlines.. but only because it will treat A B C as three arguments.

so
shuf -e A B C
will shuffle A B and C
but shuf -e "A B C"
will not shuffle A B and C

We can use this to read each line into an array and then print it out again with echo.

while read line;

Reads in each line into $line when it is passed with < to this loop.

do shuffled=( $(shuf -e $line) )

Makes an array out of each line in the $shuffled variable, by literally expanding shuf -e $line to shuf -e A B C.

echo ${shuffled[*]}

echos our array, by default printing each element with spaces in between

< ~/test

feeds lines from ~/test into our loop.

share|improve this answer

edited 2 mins ago

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

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0

To pass the parameters as one line:

shuf -e one two three four is what you need.

shuf -e $(cat <file>) | tr "n" " " for a file with one line, as in your example.

For multiple lines:

while read line; do shuf -e $line | tr "n" " " && echo n; done < <file>

share|improve this answer

edited 30 mins ago

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This will print each element out on a newline though..
  
  – Zhenhir
  32 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Zhenhir: edited.
  
  – Quora Feans
  28 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That’s funny;  just a moment ago I read a comment that said “don’t abuse cat”.
  
  – G-Man
  3 mins ago
  

  
  
  
  

add a comment | 

0

To pass the parameters as one line:

shuf -e one two three four is what you need.

shuf -e $(cat <file>) | tr "n" " " for a file with one line, as in your example.

For multiple lines:

while read line; do shuf -e $line | tr "n" " " && echo n; done < <file>

share|improve this answer

edited 30 mins ago

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This will print each element out on a newline though..
  
  – Zhenhir
  32 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Zhenhir: edited.
  
  – Quora Feans
  28 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That’s funny;  just a moment ago I read a comment that said “don’t abuse cat”.
  
  – G-Man
  3 mins ago
  

  
  
  
  

add a comment | 

To pass the parameters as one line:

shuf -e one two three four is what you need.

shuf -e $(cat <file>) | tr "n" " " for a file with one line, as in your example.

For multiple lines:

while read line; do shuf -e $line | tr "n" " " && echo n; done < <file>

share|improve this answer

edited 30 mins ago

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

share|improve this answer

edited 30 mins ago

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

answered 39 mins ago

Quora FeansQuora Feans

1,57755 gold badges2121 silver badges3737 bronze badges

0

Given

$ cat file

A B C

D E F

G H I J

then using shuffle from perl's List::Util module:

$ perl -MList::Util=shuffle -alpe '$_ = join " ", shuffle @F' file

C B A

E D F

I J G H

With bash read -a and shuf (it's a little tricky to get the delimiters right):

$ while read -a arr; do shuf -e "${arr[@]}" | awk -vRS= -F'n' '{NF+=0} 1'; done < file

A C B

F E D

J I G H

share|improve this answer

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

add a comment | 

0

Given

$ cat file

A B C

D E F

G H I J

then using shuffle from perl's List::Util module:

$ perl -MList::Util=shuffle -alpe '$_ = join " ", shuffle @F' file

C B A

E D F

I J G H

With bash read -a and shuf (it's a little tricky to get the delimiters right):

$ while read -a arr; do shuf -e "${arr[@]}" | awk -vRS= -F'n' '{NF+=0} 1'; done < file

A C B

F E D

J I G H

share|improve this answer

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

add a comment | 

Given

$ cat file

A B C

D E F

G H I J

then using shuffle from perl's List::Util module:

$ perl -MList::Util=shuffle -alpe '$_ = join " ", shuffle @F' file

C B A

E D F

I J G H

With bash read -a and shuf (it's a little tricky to get the delimiters right):

$ while read -a arr; do shuf -e "${arr[@]}" | awk -vRS= -F'n' '{NF+=0} 1'; done < file

A C B

F E D

J I G H

share|improve this answer

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

$ cat file

A B C

D E F

G H I J

$ perl -MList::Util=shuffle -alpe '$_ = join " ", shuffle @F' file

C B A

E D F

I J G H

$ while read -a arr; do shuf -e "${arr[@]}" | awk -vRS= -F'n' '{NF+=0} 1'; done < file

A C B

F E D

J I G H

share|improve this answer

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

answered 29 mins ago

steeldriversteeldriver

43k55 gold badges5656 silver badges9595 bronze badges

0

Your original command can be simplified to

shuf -e A B C | tr "n" " " && echo ""

or

shuffled=( $(shuf -e A B C) ) ; echo ${shuffled[*]}

Which I think is a little less hacky and is also faster from my rudimentary tests.

If you have a file at ~/test which contains

A B C

D E F

You can shuffle and echo each line with the following command

while read line; do shuffled=( $(shuf -e $line) ) ; echo ${shuffled[*]} ; done < ~/test

result:

B C A

G E F

How this works:

shuf -e splits on spaces as well as newlines.. but only because it will treat A B C as three arguments.

so
shuf -e A B C
will shuffle A B and C
but shuf -e "A B C"
will not shuffle A B and C

We can use this to read each line into an array and then print it out again with echo.

while read line;

Reads in each line into $line when it is passed with < to this loop.

do shuffled=( $(shuf -e $line) )

Makes an array out of each line in the $shuffled variable, by literally expanding shuf -e $line to shuf -e A B C.

echo ${shuffled[*]}

echos our array, by default printing each element with spaces in between

< ~/test

feeds lines from ~/test into our loop.

share|improve this answer

edited 2 mins ago

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

Your original command can be simplified to

shuf -e A B C | tr "n" " " && echo ""

or

shuffled=( $(shuf -e A B C) ) ; echo ${shuffled[*]}

Which I think is a little less hacky and is also faster from my rudimentary tests.

If you have a file at ~/test which contains

A B C

D E F

You can shuffle and echo each line with the following command

while read line; do shuffled=( $(shuf -e $line) ) ; echo ${shuffled[*]} ; done < ~/test

result:

B C A

G E F

How this works:

shuf -e splits on spaces as well as newlines.. but only because it will treat A B C as three arguments.

so
shuf -e A B C
will shuffle A B and C
but shuf -e "A B C"
will not shuffle A B and C

We can use this to read each line into an array and then print it out again with echo.

while read line;

Reads in each line into $line when it is passed with < to this loop.

do shuffled=( $(shuf -e $line) )

Makes an array out of each line in the $shuffled variable, by literally expanding shuf -e $line to shuf -e A B C.

echo ${shuffled[*]}

echos our array, by default printing each element with spaces in between

< ~/test

feeds lines from ~/test into our loop.

share|improve this answer

edited 2 mins ago

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Your original command can be simplified to

shuf -e A B C | tr "n" " " && echo ""

or

shuffled=( $(shuf -e A B C) ) ; echo ${shuffled[*]}

Which I think is a little less hacky and is also faster from my rudimentary tests.

If you have a file at ~/test which contains

A B C

D E F

You can shuffle and echo each line with the following command

while read line; do shuffled=( $(shuf -e $line) ) ; echo ${shuffled[*]} ; done < ~/test

result:

B C A

G E F

How this works:

shuf -e splits on spaces as well as newlines.. but only because it will treat A B C as three arguments.

so
shuf -e A B C
will shuffle A B and C
but shuf -e "A B C"
will not shuffle A B and C

We can use this to read each line into an array and then print it out again with echo.

while read line;

Reads in each line into $line when it is passed with < to this loop.

do shuffled=( $(shuf -e $line) )

Makes an array out of each line in the $shuffled variable, by literally expanding shuf -e $line to shuf -e A B C.

echo ${shuffled[*]}

echos our array, by default printing each element with spaces in between

< ~/test

feeds lines from ~/test into our loop.

share|improve this answer

edited 2 mins ago

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

A B C

D E F

B C A

G E F

share|improve this answer

edited 2 mins ago

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges

New contributor

Zhenhir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 40 mins ago

ZhenhirZhenhir

10922 bronze badges