bash shell nested for loop

Question

I want to write a nested for loop that has to work in the bash shell prompt  nested for loop in Single line command    For example    for i in a b  do echo  i  done a b   In the above example  for loop is executed in a single line command right  Like this I have tried the nested for loop in the shell prompt  Its not working   How to do this  Please update me on this

User · Accepted Answer

The question does not contain a nested loop  just a single loop  But THIS nested version works  too    for i in c d  do for j in a b  do echo  i  j  done  done c a c b d a d b

User · Answer

bin bash   loop figures bash  for i in 1 2 3 4 5    First loop  do     for j in   seq 1  i      do         echo  -n          done     echo  done echo   outputs                                for i in 5 4 3 2 1   First loop  do     for j in   seq - i -1      do         echo  -n          done     echo  done    outputs                                for i in 1 2 3 4 5    First loop  do     for k in   seq -5 - i      do         echo -n         done     for j in   seq 1  i      do         echo  -n           done     echo  done echo    outputs                                                         for i in 1 2 3 4 5    First loop  do     for j in   seq -5 - i      do         echo  -n           done     echo      for k in   seq 1  i      do         echo -n         done done echo    outputs                                                         exit 0

User · Answer

One one line  semi-colons necessary    for i in 0 1 2 3 4 5 6 7 8 9  do for j in 0 1 2 3 4 5 6 7 8 9  do echo   i j   done  done   Formatted for legibility  no semi-colons needed    for i in 0 1 2 3 4 5 6 7 8 9 do     for j in 0 1 2 3 4 5 6 7 8 9     do          echo   i j      done done   There are different views on how the shell code should be laid out over multiple lines  that s about what I normally use  unless I put the next operation on the same line as the do  saving two lines here

[bash] bash shell nested for loop

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