Integer ASCII value to character in BASH using printf

Question

Character to value works     printf   d n    A 65      I have two questions  the first one is most important    How do I take 65 and turn it into A    A converts an ASCII character to its value using printf  Is the syntax specific to printf or is it used anywhere else in BASH   Such small strings are hard to Google for

User · Answer

Here s yet another way to convert 65 into A  via octal    help printf    in Bash man bash   less -Ip      blank    printf   printf   d n    A  printf   d n    A   printf   b n     printf    03o  65     To search in man bash for    use  though futile in this case    man bash   less -Ip           press  lt n gt  to go through the matches

User · Answer

One line  printf   x  printf  x 65     Two lines  set   printf  x 65  printf   x 1    Here is one if you do not mind using awk  awk  BEGIN printf   c   65

User · Answer

For capital letters   i 67 letters   A  Z   echo    letters  i-65      Output    C

User · Answer

this prints all the  quot printable quot  characters of your basic bash setup  printf   b n    printf     03o   30  127       quot     amp       -  0123456789   lt   gt   ABCDEFGHIJKLMNOPQRSTUVWXYZ      abcdefghijklmnopqrstuvwxyz

User · Answer

If you want to save the ASCII value of the character   I did this in BASH and it worked     char  A   testing    printf   d      char      echo  testing    output  65

User · Answer

One option is to directly input the character you re interested in using hex or octal notation   printf   x41 n  printf   101 n

User · Answer

If you convert 65 to hexadecimal it s 0x41     echo -e   x41  A

User · Answer

For your second question  it seems the leading-quote syntax    A  is specific to printf   If the leading character is a single-quote or double-quote  the value shall be the numeric value in the underlying codeset of the character following the single-quote or double-quote   From https   pubs opengroup org onlinepubs 9699919799 utilities printf html

User · Answer

For this kind of conversion  I use perl   perl -e  printf   c n   65

User · Answer

Here is a solution without eval nor     nor      ord       local s  printf -v s     03o   1  printf  quot  s quot     ord 65

User · Answer

This works  with the value in octal      printf   b    101  A   even for  some  don t go over 7  sequences     printf   b      101  107  ABCDEFG   A general construct that allows  decimal  values in any range is     printf   b    printf     03o   65  122   ABCDEFGHIJKLMNOPQRSTUVWXYZ      abcdefghijklmnopqrstuvwxyz   Or you could use the hex values of the characters     printf   b    printf    x x   65  122   ABCDEFGHIJKLMNOPQRSTUVWXYZ      abcdefghijklmnopqrstuvwxyz     You also could get the character back with xxd  use hexadecimal values      echo  41    xxd -p -r A   That is  one action is the reverse of the other     printf   x    A    xxd -p -r A   And also works with several hex values at once     echo  41 42 43 44 45 46 47 48 49 4a    xxd -p -r ABCDEFGHIJ   or sequences  printf is used here to get hex values      printf   x   65  90    xxd -r -p  ABCDEFGHIJKLMNOPQRSTUVWXYZ     Or even use awk     echo 65   awk   printf   c   1    A   even for sequences     seq 65 90   awk   printf   c   1    ABCDEFGHIJKLMNOPQRSTUVWXYZ

[bash] Integer ASCII value to character in BASH using printf

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