Using awk to align columns in text file?

Question

Would awk be useful to convert \"Input\" to \"Desired output\"?

Input

testing speed of encryption
test 0 (64 bit key, 1         


        

Answer 1

Yes. Look at the syntax for awk's printf() function. Abbreviated sample code . . .

{
  printf("%s %2s ", $1, $2);
  printf("%4s %s %s ", $3, $4, $5);
  printf("%4s %s %s ", $6, $7, $8);
  printf("%7s\n", $9);
}

Output.

test  0  (64 bit key,   16 byte blocks): 2250265
test  1 (128 bit key,   64 byte blocks):  879149
test  2 (128 bit key,  256 byte blocks):  258978
test  3 (128 bit key, 1024 byte blocks):   68218
test  4 (128 bit key, 8192 byte blocks):    8614
test 10 (256 bit key,   16 byte blocks): 1790881

Docs for GNU awk's printf().

There are several ways to pass the "heading" through unmodified. This way assumes it's always on the first line of the file.

NR==1 { print $0}
NR>1 {
  printf("%s %2s ", $1, $2);
  printf("%4s %s %s ", $3, $4, $5);
  printf("%4s %s %s ", $6, $7, $8);
  printf("%7s\n", $9);
}

Answer 2

awk '
FNR==1 { if (NR==FNR) print; next }
NR==FNR {
   for(i=1;i<=NF;i++)
      w[i] = (w[i] <= length($i) ? length($i) : w[i])
   next
}
{
   for(i=1;i<=NF;i++)
      printf "%*s",w[i]+(i>1?1:0),$i
   print ""
}
' file file

Answer 3

A trick to align right using column is to use rev:

$ head -1 file; tail -n+2 file | rev | column -t | rev
testing speed of encryption
test   0   (64  bit  key,    16  byte  blocks):  2250265  operations  in  1  seconds  (36004240  bytes)
test   1  (128  bit  key,    64  byte  blocks):   879149  operations  in  1  seconds  (56265536  bytes)
test   2  (128  bit  key,   256  byte  blocks):   258978  operations  in  1  seconds  (66298368  bytes)
test   3  (128  bit  key,  1024  byte  blocks):    68218  operations  in  1  seconds  (69855232  bytes)
test   4  (128  bit  key,  8192  byte  blocks):     8614  operations  in  1  seconds  (70565888  bytes)
test  10  (256  bit  key,    16  byte  blocks):  1790881  operations  in  1  seconds   (3654096  bytes)