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How to get the nth line from a file and save the result to a variable [duplicate]

How do I set a variable to the output of a command in Bash?Bash tool to get nth line from a fileGet the source directory of a Bash script from within the script itselfHow can I remove the first line of a text file using bash/sed script?How to check if a program exists from a Bash script?How do I tell if a regular file does not exist in Bash?How to count all the lines of code in a directory recursively?Looping through the content of a file in BashHow to check if a variable is set in Bash?How to concatenate string variables in BashHow do I set a variable to the output of a command in Bash?Read a file line by line assigning the value to a variable

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0

This question already has an answer here:

• 
  Bash tool to get nth line from a file
  
  18 answers
  
  


• 
  How do I set a variable to the output of a command in Bash?
  
  14 answers
  
  

So, I am creating a script in bash and I am trying to read a text file which is saved in the same directory. I need to read the nth line of that file and then save it to a variable to be used later but I'm not sure how I can do this

What I have currently tried is listed below but it essentially reads the line from the file, saves it a variable and then deletes that line from the file and repeats. This is a hack and although it works, isn't what I want, I can't get the nth value and it's deleting from the file which I definitely don't want.

read -r first<"test.txt" // reads first line and stores in first
sed -i -e "1d" "test.txt" . // removes first line
read -r second<"test.txt" // reads first line and stores in second 
sed -i -e "1d" "test.txt" . // removes first line

If I wanted to get the 2nd line for example, I have seen sed '2q;d' file but not sure how/where the result is saved. It gets printed in terminal? Any help appreciated, thanks!w

bash shell terminal

share|improve this question

asked Mar 28 at 15:02

NoumanNouman

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marked as duplicate by Socowi, tripleee bash
Users with the  bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Mar 28 at 16:19

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.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can also write that sed as sed -n '2p;q' which I find (a little) more obvious.
  
  – glenn jackman
  Mar 28 at 15:58
  

  
  
  
  

add a comment
 | 

0

This question already has an answer here:

• 
  Bash tool to get nth line from a file
  
  18 answers
  
  


• 
  How do I set a variable to the output of a command in Bash?
  
  14 answers
  
  

So, I am creating a script in bash and I am trying to read a text file which is saved in the same directory. I need to read the nth line of that file and then save it to a variable to be used later but I'm not sure how I can do this

What I have currently tried is listed below but it essentially reads the line from the file, saves it a variable and then deletes that line from the file and repeats. This is a hack and although it works, isn't what I want, I can't get the nth value and it's deleting from the file which I definitely don't want.

read -r first<"test.txt" // reads first line and stores in first
sed -i -e "1d" "test.txt" . // removes first line
read -r second<"test.txt" // reads first line and stores in second 
sed -i -e "1d" "test.txt" . // removes first line

If I wanted to get the 2nd line for example, I have seen sed '2q;d' file but not sure how/where the result is saved. It gets printed in terminal? Any help appreciated, thanks!w

bash shell terminal

share|improve this question

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

marked as duplicate by Socowi, tripleee bash
Users with the  bash badge can single-handedly close bash questions as duplicates and reopen them as needed.

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Mar 28 at 16:19

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.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can also write that sed as sed -n '2p;q' which I find (a little) more obvious.
  
  – glenn jackman
  Mar 28 at 15:58
  

  
  
  
  

add a comment
 | 

This question already has an answer here:

• 
  Bash tool to get nth line from a file
  
  18 answers
  
  


• 
  How do I set a variable to the output of a command in Bash?
  
  14 answers
  
  

So, I am creating a script in bash and I am trying to read a text file which is saved in the same directory. I need to read the nth line of that file and then save it to a variable to be used later but I'm not sure how I can do this

What I have currently tried is listed below but it essentially reads the line from the file, saves it a variable and then deletes that line from the file and repeats. This is a hack and although it works, isn't what I want, I can't get the nth value and it's deleting from the file which I definitely don't want.

read -r first<"test.txt" // reads first line and stores in first
sed -i -e "1d" "test.txt" . // removes first line
read -r second<"test.txt" // reads first line and stores in second 
sed -i -e "1d" "test.txt" . // removes first line

If I wanted to get the 2nd line for example, I have seen sed '2q;d' file but not sure how/where the result is saved. It gets printed in terminal? Any help appreciated, thanks!w

bash shell terminal

share|improve this question

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

read -r first<"test.txt" // reads first line and stores in first
sed -i -e "1d" "test.txt" . // removes first line
read -r second<"test.txt" // reads first line and stores in second 
sed -i -e "1d" "test.txt" . // removes first line

share|improve this question

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

share|improve this question

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

asked Mar 28 at 15:02

NoumanNouman

10933 silver badges1313 bronze badges

2 Answers
2

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oldest

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1

sed '2q;d' file

prints the second line in file to the terminal.

To populate a variable with it, use bash's command expansion feature:

$ var=$(sed '2q;d' file)
$ echo "$var"
this is second line

share|improve this answer

edited Mar 28 at 15:16

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

add a comment
 | 

0

Simple solution using head and tail:

a=$(head -2 test.txt | tail -1 )

Saves the second line of test.txt to the variable $a.

share|improve this answer

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

add a comment
 | 

1

sed '2q;d' file

prints the second line in file to the terminal.

To populate a variable with it, use bash's command expansion feature:

$ var=$(sed '2q;d' file)
$ echo "$var"
this is second line

share|improve this answer

edited Mar 28 at 15:16

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

add a comment
 | 

1

sed '2q;d' file

prints the second line in file to the terminal.

To populate a variable with it, use bash's command expansion feature:

$ var=$(sed '2q;d' file)
$ echo "$var"
this is second line

share|improve this answer

edited Mar 28 at 15:16

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

add a comment
 | 

sed '2q;d' file

prints the second line in file to the terminal.

To populate a variable with it, use bash's command expansion feature:

$ var=$(sed '2q;d' file)
$ echo "$var"
this is second line

share|improve this answer

edited Mar 28 at 15:16

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

sed '2q;d' file

$ var=$(sed '2q;d' file)
$ echo "$var"
this is second line

share|improve this answer

edited Mar 28 at 15:16

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

answered Mar 28 at 15:09

oguz ismailoguz ismail

12.8k77 gold badges1919 silver badges3737 bronze badges

0

Simple solution using head and tail:

a=$(head -2 test.txt | tail -1 )

Saves the second line of test.txt to the variable $a.

share|improve this answer

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

add a comment
 | 

0

Simple solution using head and tail:

a=$(head -2 test.txt | tail -1 )

Saves the second line of test.txt to the variable $a.

share|improve this answer

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

add a comment
 | 

Simple solution using head and tail:

a=$(head -2 test.txt | tail -1 )

Saves the second line of test.txt to the variable $a.

share|improve this answer

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

a=$(head -2 test.txt | tail -1 )

share|improve this answer

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges

answered Mar 28 at 15:58

mttpgnmttpgn

22822 silver badges1111 bronze badges