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Bash: Iterating 2 lists using single For In loop

What is the meaning of IFS=$'n' in bash scripting?Read files in Directory and take diffCat 2 files and avoid duplication of linesbash script loses readonly value after first time thru loopParse two files input in for/while loop'Tar' the result of a 'find', preserving the directory structureComparing each file in two directories and copying it to another if it differs from its counterpartComparing 2 directories and copying the different sub-directories to a 3rd directoryHow to write output to a file of the same name as the input?How do I run a diff of short file names?for loop to prepend dir name to file names

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

2

Suppose I have 2 seperate loops

for file1 in `ls Dir1/` ; do

    echo $file1

done



for file2 in `ls Dir2/` ; do

    echo $file2

done

I want Single loop to iterate both Directories
pseudocode

for file1 , file2 in `ls Dir1` , `ls Dir2`

do

    echo $file1

    echo file2

done

Is it possible

linux bash shell

share|improve this question

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you cant do that, but you could use a function that takes the dir as a parameter and iterates through its files.
  
  – jai_s
  Feb 12 '16 at 16:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if you explain what actually you are trying to do, instead of a code which does nothing significant, may be you can get a different suggestion than looping through two directories in a single for loop. Just a thought.
  
  – MelBurslan
  Feb 12 '16 at 16:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I want to iterate files of 2 directories 1 by 1
  
  – Muhammad Danish
  Feb 12 '16 at 16:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  dir1 has many files dir2 has many files I want to work on file1 from dir1 and file1 from dir2 and so on
  
  – Muhammad Danish
  Feb 12 '16 at 16:49
  

  
  
  
  

add a comment | 

2

Suppose I have 2 seperate loops

for file1 in `ls Dir1/` ; do

    echo $file1

done



for file2 in `ls Dir2/` ; do

    echo $file2

done

I want Single loop to iterate both Directories
pseudocode

for file1 , file2 in `ls Dir1` , `ls Dir2`

do

    echo $file1

    echo file2

done

Is it possible

linux bash shell

share|improve this question

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you cant do that, but you could use a function that takes the dir as a parameter and iterates through its files.
  
  – jai_s
  Feb 12 '16 at 16:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if you explain what actually you are trying to do, instead of a code which does nothing significant, may be you can get a different suggestion than looping through two directories in a single for loop. Just a thought.
  
  – MelBurslan
  Feb 12 '16 at 16:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I want to iterate files of 2 directories 1 by 1
  
  – Muhammad Danish
  Feb 12 '16 at 16:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  dir1 has many files dir2 has many files I want to work on file1 from dir1 and file1 from dir2 and so on
  
  – Muhammad Danish
  Feb 12 '16 at 16:49
  

  
  
  
  

add a comment | 

Suppose I have 2 seperate loops

for file1 in `ls Dir1/` ; do

    echo $file1

done



for file2 in `ls Dir2/` ; do

    echo $file2

done

I want Single loop to iterate both Directories
pseudocode

for file1 , file2 in `ls Dir1` , `ls Dir2`

do

    echo $file1

    echo file2

done

Is it possible

linux bash shell

share|improve this question

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

for file1 in `ls Dir1/` ; do

    echo $file1

done



for file2 in `ls Dir2/` ; do

    echo $file2

done

for file1 , file2 in `ls Dir1` , `ls Dir2`

do

    echo $file1

    echo file2

done

share|improve this question

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

share|improve this question

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

asked Feb 12 '16 at 16:41

Muhammad DanishMuhammad Danish

134

2 Answers
2

active

oldest

votes

2

A while loop with suitable input can do the job, assuming no IFS-thwarting characters in the directory listings.

paste <(ls /var) <(ls /usr) | while read e u; do echo $e $u; done

share|improve this answer

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you Can you tell me what is IFS-thwarting characters or you can give me link
  
  – Muhammad Danish
  Feb 12 '16 at 16:50
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I got it what is meant by IFS unix.stackexchange.com/questions/184863/…
  
  – Muhammad Danish
  Feb 12 '16 at 16:55
  

  
  
  
  

add a comment | 

0

The output of multiple variables can be saved in single variable as mentioned below one. Check if it works for you

#!/bin/bash

cd /

for file1 in $(ls /usr/ ; echo "::::::NEXT:::::::" ; ls /sys/)

do

    echo $file1

done

share

answered 3 mins ago

linux.cnflinux.cnf

1

add a comment | 

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2

A while loop with suitable input can do the job, assuming no IFS-thwarting characters in the directory listings.

paste <(ls /var) <(ls /usr) | while read e u; do echo $e $u; done

share|improve this answer

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you Can you tell me what is IFS-thwarting characters or you can give me link
  
  – Muhammad Danish
  Feb 12 '16 at 16:50
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I got it what is meant by IFS unix.stackexchange.com/questions/184863/…
  
  – Muhammad Danish
  Feb 12 '16 at 16:55
  

  
  
  
  

add a comment | 

2

A while loop with suitable input can do the job, assuming no IFS-thwarting characters in the directory listings.

paste <(ls /var) <(ls /usr) | while read e u; do echo $e $u; done

share|improve this answer

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you Can you tell me what is IFS-thwarting characters or you can give me link
  
  – Muhammad Danish
  Feb 12 '16 at 16:50
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I got it what is meant by IFS unix.stackexchange.com/questions/184863/…
  
  – Muhammad Danish
  Feb 12 '16 at 16:55
  

  
  
  
  

add a comment | 

A while loop with suitable input can do the job, assuming no IFS-thwarting characters in the directory listings.

paste <(ls /var) <(ls /usr) | while read e u; do echo $e $u; done

share|improve this answer

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

paste <(ls /var) <(ls /usr) | while read e u; do echo $e $u; done

share|improve this answer

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

answered Feb 12 '16 at 16:47

thrigthrig

25.5k23660

0

The output of multiple variables can be saved in single variable as mentioned below one. Check if it works for you

#!/bin/bash

cd /

for file1 in $(ls /usr/ ; echo "::::::NEXT:::::::" ; ls /sys/)

do

    echo $file1

done

share

answered 3 mins ago

linux.cnflinux.cnf

1

add a comment | 

0

The output of multiple variables can be saved in single variable as mentioned below one. Check if it works for you

#!/bin/bash

cd /

for file1 in $(ls /usr/ ; echo "::::::NEXT:::::::" ; ls /sys/)

do

    echo $file1

done

share

answered 3 mins ago

linux.cnflinux.cnf

1

add a comment | 

The output of multiple variables can be saved in single variable as mentioned below one. Check if it works for you

#!/bin/bash

cd /

for file1 in $(ls /usr/ ; echo "::::::NEXT:::::::" ; ls /sys/)

do

    echo $file1

done

share

answered 3 mins ago

linux.cnflinux.cnf

1

#!/bin/bash

cd /

for file1 in $(ls /usr/ ; echo "::::::NEXT:::::::" ; ls /sys/)

do

    echo $file1

done

share

answered 3 mins ago

linux.cnflinux.cnf

1

answered 3 mins ago

linux.cnflinux.cnf

1

answered 3 mins ago

linux.cnflinux.cnf

1